情款待，並也互相交流學術心得及知識，可謂不虛此行。
本人也於 2008 年 10 月 22 日至 11 月 4 日前往大陸合肥的中國科 大作交流訪問，並與中國科大劉士勇、潘才元及張廣照教授(均為國 際知名期刊 Macromolecules 之編輯委員)進行學術之相互交流與探 討。同時進行相關合作研究，以我方擅長之合成製出新的高分子材 料，而對方進一步的作物理上之研究與探討。其中我方提供了新型高 分子材料包括：含雙蒎螢光基團之原冰片烯聚合物及具有感溫和 pH 感測性質的 POLY(NBDMAEMA)、POLY(NBNIPAM)等聚合物。
CH3
C O O CH2
CH2
N CH3
H3C CH2 C
CH3
C O O CH2
CH2
N CH3
H3C
CH3
C O O CH2
CH2 N CH3
H3C
n CH3
C O O CH2
CH2
N H3C CH3
POLY(NBDMAEMA)
n
C O NH CH H3C CH3
C O NH CH H3C CH3
C C O NH CH H3C CH3
C
+
C O NH CH H3C CH3
POLY(NBNIPAM)
本人於計畫期間，前往世界各地參訪之經歷與多位教授交流之心
得，不僅有助於本人日後之研究工作，更可間接提升台灣國際化程度
及知名度，最後，感謝國科會在經費上之支持，使筆者得以順利進往。
Novel Organosoluble Poly(pyridine-imide) with Pendent Pyrene Group: Synthesis, Thermal, Optical, Electrochemical, Electrochromic, and Protonation Characterization
Der-Jang Liaw,*,†Kun-Li Wang,‡and Feng-Chyuan Chang†
Department of Chemical Engineering, National Taiwan UniVersity of Science and Technology, Taipei, 106 Taiwan, and Department of Chemical Engineering and Biotechnology, National Taipei UniVersity of Technology, Taipei 106, Taiwan
ReceiVed NoVember 4, 2006; ReVised Manuscript ReceiVed February 16, 2007
ABSTRACT: A new diamine containing a pyridine heterocyclic group and a pyrene substituent, 4-(1-pyrene)-2,6-bis(4-aminophenyl)pyridine (PBAPP), was synthesized and used in a preparation of poly(pyridine-imide) by direct polycondensation with 4,4′-hexafluoroisopropylidenediphathalic anhydride (6FDA) in N-methyl-2-pyrrolidinone (NMP). The poly(pyridine-imide) derived from diamine (PBAPP) was highly soluble in several solvents such as THF, NMP, DMAc, DMF, pyridine, DMSO, and cyclohexanone at room temperature or upon heating at 70°C and exhibited good thermal stability both in nitrogen and air (Td10>520°C) and a high dielectric constant of 4.32 at 1 kHz. The poly(pyridine-imide) could be cast into a flexible and tough film from DMAc solution. The poly(pyridine-imide) film had a tensile strength of 118 MPa and a tensile modulus of 2.2 GPa.
The optical properties exhibited the UV-vis absorption bands at the region of 200-400 nm and possessed strong orange fluorescent (560 nm) after protonated with protic acid.
Introduction
Polyimides constantly attract wider interest because of their unique mechanical properties, thermal stability, and morphologi-cal properties.1-7Conventional polyimides like Kapton produced by DuPont have been applied to microelectronic devices and aerospace fields. However, these polyimides are generally insoluble in organic solvent, exhibit low optical transparency, and have an intense yellow color. Soluble polyimides are needed as coating materials on specific space components. In order to overcome this drawback, either bulky lateral substituents, flexible alkyl side chains, unsymmetric, alicyclic or kinked structure have been attached along the backbone.8-14The rigid-rod polyimides with high organic solubility have attracted some research efforts in recent years. These efforts have been focused on designing and synthesizing new rigid diamines that resulted in soluble and processable polyimides without deterioration of their positive properties.
In particular, polymers have attracted considerable attention because of their good scalability, mechanical strength, flexibility, and most important of all, ease of processing. In the recent years, there has been a considerable interest in the photoluminescent and electroluminescent properties of conjugated polymers.15-17 These polymer materials are used for several electronic ap-plications, including light-emitting devices (LEDs), transistors, photovoltaic cells, polymer memory, and switches.16,18-24 However, certain non-conjugated polymers, e.g., polyimides, in combination with electron transporting layers, also rank among efficient electroluminophores.22-24Recently, some re-ports have concerned the incorporation of pyridine and its derivatives into polymeric frameworks.25Compared to a benzene ring, pyridine is an electron-deficient aromatic heterocycle, with
a localized lone pair of electrons in sp2orbital on the nitrogen atom; consequently, the derived polymers have increased electron affinity,26improved electron-transporting properties,27 and offer the possibility of protonation or alkylation of the lone pair electrons as a way of modifying their properties.28,29On the other hand, the pyrene unit is an efficient fluorescent probe because it has a long singlet lifetime and readily forms excimer.30A literature survey revealed that there are a limited number of investigations concerning the attachment of pyrene to polyimides.31,32Pyrene containing polymers have been used as acceptors for energy transfer from various donors.33,34 Additionally, the bulky condensed aromatic ring of pyrene is expected to enhance the solubility and thermal stability of polyimides.
The present investigation deals with the synthesis and characterization of a new poly(pyridine-imide) derived from a new monomer, 4-(1-pyrene)-2,6-bis(4-aminophenyl)pyridine (PBAPP), containing heterocyclic pyridine and pyrene substit-uents. The solubility, electrochemical stability, mechanical, thermal and optical properties of the obtained poly(pyridine-imide) were investigated.
Experimental
Materials. The materials, 1-pyrenecarboxaldehyde, 4′ -nitroac-etophenone, ammonium acetate, hydrazine monohydrate, and 10%
palladium on activated carbon were purchased from Merck and used as received. Glacial acetic acid was purchased from Aldrich Chemical Co. and used as received. 4,4′-Hexafluoroisopropylidene-diphathalic anhydride (6FDA, TCI) was recrystallized twice from acetic anhydride, and then sublimated before use. The solvents, N-methyl-2-pyrrolidinone (NMP), tetrahydrofuran (THF), N,N′-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF) were
3568 Macromolecules 2007, 40, 3568-3574
flask, a mixture of 15 g (65 mmol) of 1-pyrenecarboxaldehyde, 21.5 g (130 mmol) of 4′-nitroacetophenone, 100.4 g (1.3 mol) of ammonium acetate, and 300 mL of glacial acetic acid was refluxed for 16 h. Upon cooling, the precipitated light yellow solid was collected by filtration and washed with cold N,N′-dimethylacetamide (DMAc). The crude product was recrystallized from DMAc five times to afford 8.1 g (57%) of light yellow needles; mp 333°C (by DSC). FTIR (KBr): 1523 and 1345 cm-1(NO2).1H NMR (500 MHz, DMSO-d6): δ8.67-8.65 (d, 4H), 8.50 (s, 2H),8.48 (s, 1H), 8.42-8.40 (d, 4H), 8.39 (s, 1H), 8.37-8.35 (d, 1H), 8.31 (s, 2H), 8.30-8.29 (d, 1H), 8.26-8.24 (d, 2H), 8.16-8.13 (t, 1H). Anal.
Calcd for C33H19N3O4: C, 76.00; H, 3.67; N,8.06. Found: C, 76.00;
H, 3.86; N, 7.98.
4-(1-Pyrene)-2,6-bis(4-aminophenyl)pyridine (PBAPP, 2). A mixture of 2.7 g (5.1 mmol) of PBNPP, 0.13 g of 10% Pd/C, 2.5 mL of hydrazine monohydrate, and 200 mL of ethanol was placed in a flask. The reaction was heating at 90°C for 24 h and then removed the ethanol under reduce pressure. THF (50 mL) used as a solvent was added to the mixture, filtered to remove Pd/C and removed the THF using rotation evaporator. The light yellow solid was recrystallized from THF/ethanol (10/1, v/v) twice and dried under vacuum. The yield was 67%; mp 266°C (by DSC). FTIR (KBr): 3472, 3379, 1247 cm-1.1H NMR (500 MHz, DMSO-d6):
δ 8.40-8.38 (d, 1H), 8.33-8.31 (d, 1H), 8.28-8.26 (d, 1H), 8.23 (s, 2H), 8.17-8.14 (m, 3H), 8.10-8.06 (t, 1H), 8.03-8.02 (d, 4H), 7.75 (s, 2H), 6.71-6.70 (d, 4H), 5.45 (s, 4H).13C NMR (125 MHz, DMSO-d6): δ 156.1, 150.0, 149.4, 135.6, 130.9, 130.7, 130.4, 128.1, 127.8, 127.7, 127.6, 127.3, 127.2, 126.5, 126.4, 125.5, 125.2, 125.0, 124.3, 124.1, 124.0, 116.5, 113.7. Anal. Calcd for C33H23N3: C, 85.87; H, 5.03; N, 9.10. Found: C, 85.94; H, 5.01;
N, 9.05.
Synthesis of Poly(pyridine-imide). To a stirred solution of 0.6183 g (1.3 mmol) of (PBAPP) in 5 mL of N-methyl-2-pyrrolidinone (NMP), 0.5775 g (1.3 mmol) of 4,4′ -hexafluoroiso-propylidenediphathalic anhydride were gradually added. The mix-ture was stirred at ambient temperamix-ture overnight (ca. 12 h) to form the poly(amic acid). Chemical cyclodehydration was carried out by addition of 1 mL of acetic anhydride and 0.5 mL of pyridine into the above-mentioned poly(amic acid) solution with stirring at room temperature for 1 h, and then heating at 110 °C for 4 h (Scheme 2). The polymer solution was poured into methanol. The precipitate was filtered, washed with methanol, and dried at 100°C under vacuum. The inherent viscosity of the polymer in N,N-dimethylacetamide was 0.58 dL‚g-1, measured at a concentra-tion 0.5 g dL-1at 30°C. FTIR (KBr): 1784, 1724, 1372 cm-1.1H NMR (500 MHz, DMSO-d6): δ 8.46 (s, 4H), 8,27-8.08 (m, 15H), 7.91 (s, 2H), 7.65-7.64 (d, 4H).13C NMR (125 MHz, DMSO-d6):
δ 166.6, 157.0, 152.1, 139.6, 139.4, 136.8, 136.7, 136.1, 134.3, 134.0, 133.9, 132.5, 132.0, 129.3, 129.2, 128.9, 128.4, 128.2, 128.1, 127.4, 127.2, 126.5, 126.2, 125.9, 125.8, 125.7, 125.4, 124.7, 123.7, 121.7, 121.4, 66.3. Anal. Calcd for C52H25N3O4F6: C, 71.81; H, 2.90; N, 4.83. Found: C, 70.68; H, 3.29; N, 4.97.
Measurements. FTIR spectra were recorded in the range 4000-400 cm-1for the synthesized monomers and polymers in an KBr disk (Bio-Rad Digilab FTS-3500). Elemental analysis was made on a Perkin-Elmer 2400 instrument. The inherent viscosity of
chromatography (GPC). Calibration was made by using polystyrene as standard with molecular weight in the range of 1680-402100 g/mol. Four Waters (UltraStyragel) columns (300× 7.7 mm, guard, 105, 104, 103, and 500 Å in a series) were used for GPC analysis with tetrahydrofuran (THF; 1 mL min-1) as the eluent. The eluents were monitored with a UV detector (JMST Systems, VUV-24, USA) at 254 nm. Thermogravimetric data were obtained on a TA Instruments Dynamic TGA 2950 under nitrogen and air flowing condition at a rate of 50 cm3min-1 and a heating rate of 10°C min-1. Melting points of monomers and glass transition temperature of polymer were performed on a differential scanning calorimeter (TA Instruments TA 910) under nitrogen flowing conditions at a rate of 50 cm3min-1and a heating rate of 10°C min-1. Dielectric constants of polyimide thin film were measured by the parallel-plate capacitor method using a dielectric analyzer (TA Instrumenents DEA 2970) at the range of frequency 1-10 kHz. Gold electrodes were vacuum-deposited on both surfaces of dried film, and measurement were made at 25°Cunder N2atmosphere. Average tensile properties were determined at room temperature with five specimens from the stress-strain curve obtained with an Orientec Tensilon with a load cell of 10 kg. A gauge of 2 cm was used for this study in a strain rate of 2 cm min-1. UV-vis spectra of the polymer film were recorded on a V-550 spectrophotometer at room Scheme 1. Synthesis of New Monomer
4-(1-Pyrene)-2,6-bis(4-aminophenyl)pyridine (2)
Scheme 2. Preparation of Poly(pyridine-imide)
Scheme 3. Ref-1
Macromolecules, Vol. 40, No. 10, 2007 Novel Organosoluble Poly(pyridine-imide) 3569
Results and Discussion
Monomers Synthesis. Scheme 1 shows the synthesis of the novel diamine compound, 4-(1-pyrene)-2,6-bis(4-aminophenyl) pyridine (PBAPP). The dinitro compound (PBNPP) containing a pyridine heterocyclic ring and a pyrene pendent group was synthesized with a modified Chichibabin reaction, which was a facile way for the preparation of substituted pyridine.35,36The condensation of 1-pyrenecarboxaldehyde with 4′ -nitroacetophe-none in the presence of ammonium acetate afforded dinitro (PBNPP) in one step. Reduction of the dinitro derivative (PBNPP) in ethanol with hydrazine monohydrate in the presence of catalytic amount of palladium on activated carbon at 90°C produced a new diamine compound (PBAPP). Elemental analysis, FTIR, and NMR spectroscopes confirmed the structures of these compounds. As shown in the experimental part, the
1H NMR spectra indicated the formation of the pyridine heterocyclic group present at 8.50 ppm for dinitro (PBNPP) and 7.75 ppm for diamine (PBAPP). When the dinitro com-pound was reduced to diamine, a new signal at 5.45 ppm due to the amino group in the1H NMR spectrum appeared. These results clearly confirm that the diamine (PBAPP) prepared herein is consistent with the proposed structure.
Preparation of Poly(pyridine-imide). In this study, we synthesized only one poly(pyridine-imide) from 6FDA. As described in experimental part, recrystallization has to be carried out from DMAc five times in order to get the pure dinitro compound. The solubility of this dinitro compound is also very poor. Furthermore, the pure diamine has to be recrystallized two times and the preservation is also hard due to denaturaliza-tion. Therefore, we choose 6FDA dianhydride to synthesize a poly(pyridine-imide), because many papers reported that poly-imides containing 6FDA show good thermal and mechanical properties and good solubility as well as and colorless films.37,38 Colorless and transparent are important factors for optoelectrical materials. Poly(pyridine-imide) was prepared by the conven-tional two-steps polymerization method, as shown in Scheme 2, involving ring-opening polyaddition forming poly(amic acid) and subsequent chemical imidization. Reaction of dianhydride with diamine at ambient temperature gave a viscous poly(amic acid) solution. The chemical imidization of poly(amic acid) with a dehydrating agent such as a mixture of acetic anhydride and pyridine was effective in obtaining the desired polyimide. The polyimide obtained by chemical imidization had inherent viscosity of 0.58 dL‚g-1 in DMAc. The number-average molecular weights (Mhn) and weight-average molecular weights (Mhw) of poly(pyridine-imide) measured by GPC relative to polystyrene standards were 2.5 × 104and 5.7 × 104g/mol, respectively. The molecular weight of poly(pyridine-imide) was sufficient to cast a tough and flexible film. The elemental analysis values of the poly(pyridine-imide) was in agreement with its respective structure. The FTIR spectrum exhibited characteristic absorption bands around 1784 and 1724 cm-1due to the asymmetric and symmetric stretches of carbonyl group of imide, and a band around 1371 cm-1 for the C-N bond.
The FTIR spectrum confirms the formation of the imide due to imidization. The chemical structure of the poly(pyridine-imide)
and trifluoromethyl group in the dianhydride reduce packing force and result in good solubility of the polyimide.
The thermal properties of the poly(pyridine-imide) were evaluated in powder form by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The poly-(pyridine-imide) did not show any glass transition up to 350°C. The thermal stability of the poly(pyridine-imide) was evaluated by TGA measurements in both air and nitrogen atmospheres at a heating rate of 10°C min-1. The TGA curve for poly(pyridine-imide) is showed in Figure 1. The poly-(pyridine-imide) almost shows no degradation below 500°C in air and nitrogen. The temperatures for 10% weight loss of poly(pyridine-imide) in nitrogen and air were 544 and 529°C, respectively. The good thermal stability of poly(pyridine-imide) is due to the presence of rigid pyridine heterocyclic diamine in the polymer backbone and a pyrene group in the pedant.39
The poly(pyridine-imide) could be cast into a film from DMAc solution and the film was color lightness, optically transparent, flexible and tough. The film exhibited ultimate tensile strengths of 118 MPa, elongation to break of 14%, and tensile modulus of 2.2 GPa. The polymer film exhibited high tensile strength; thus it could be considered as a strong material.
Figure 2 illustrates the UV-vis absorption and fluorescence emission spectra of the poly(pyridine-imide) in dilute THF solution (Figure 2a,c), and solid film (Figure 2b,d) with thickness of 87 µm. The poly(pyridine-imide) exhibited absorption maximum (λmax) at 283 nm due to the n-π* transition of the pyridine group, and theπ-π* transitions in the region of 300-400 nm. The photoluminescence spectra, which are attributed to fluorescence on account of the short lifetime of the excited states,41were obtained by irradiative excitation at the wavelength of maxima absorption. Moderate blue fluorescence resulted with emission maxima at 396 nm. This indicates that photolumines-cence took place by migration of electrons in a conduction band (π* level) to a valence band (π level). The solid poly(pyridine-imide) was prepared by spin-coating on a quartz plate from solution of poly(pyridine-imide). The absorption band shows very similar behavior to the solution phase. Comparing the Figure 1. TGA curves of poly(pyridine-imide) in nitrogen and air atmosphere at a heating rate of 10°C‚min-1.
3570 Liaw et al. Macromolecules, Vol. 40, No. 10, 2007
and MSA (methanesulfonic acid), respectively, as a function of acid concentration. In Figure 3, it is obvious that at low protonated concentrations the absorption bands are the same as neutral poly(pyridine-imide). When the acid concentration was increased, a new band appeared at 430 nm. This phenomenon was similar to the poly(2,5-pyridylene) (PPY), which has been reported in the literature.29, 41,42On protonated by HCl or MSA, the absorption intensity at 283 nm (n-π*) decreased depending on concentration of protic acid, because of the lone pair electron of the nitrogen on pyridine was quaternated by protic acid. The
between the charged pyridinium fragments. As shown in Figure 2, no abosorption band at 430 nm appears in solution as well as in solid state. Therefore, the new band at 430 nm could be a characteristic absorption band of the protonated polymer. The spectral behavior suggest a lowerπ-π* transition energy for the protonated polymer. When the protonation was carried out with MSA, a similar trend was also observed (Figure 4).
Comparing Figure 3 with Figure 4, the poly(pyridine-imide) protonated with MSA exhibited a higher absorption intensity at 430 nm. The differences depend on the strength of protic Figure 2. UV-vis spectra of poly(pyridine-imide) in THF solution and solid film.
Figure 3. Absorption spectra of poly(pyridine-imide) as a function of HCl concentration.
Macromolecules, Vol. 40, No. 10, 2007 Novel Organosoluble Poly(pyridine-imide) 3571
the poly(pyridine-imide) film exhibited the cutoff wavelength and the 80% transmission wavelength at 423 and 563 nm,
Figure 6 shows the emission spectra of poly(pyridine-imide) protonated with HCl. Nevertheless, when the HCl concentration
× 10-4 Figure 4. Absorption spectra of poly(pyridine-imide) as a function of MSA concentration.
Figure 5. Transparent spectra and film states of (a) poly(pyridine-imide) in this research and (b) Ref-1.
3572 Liaw et al. Macromolecules, Vol. 40, No. 10, 2007
equilibrium excited state.44As observed in fluorescence spectra, both protonated and unprotonated forms were present, and it can be interpreted as evidence of incomplete ionization equi-librium being established during the lifetime of the excited state.
In addition, two redox pairs were observed in cyclic voltam-mogram of the polymer where the reduction values are at -0.63 and -1.08 V and the oxidation values are at -0.2 and -0.85 V (see Supporting Information).
The electrical insulating properties, measured on the parallel-plate capacitor method using a dielectric analyzer on a thin film.
The poly(pyridine-imide) exhibited relatively high dielectric constant of 4.53-4.26 in the frequency region of 1 to 10 kHz.
The dielectric constant of poly(pyridine-imide) at 1 kHz (4.32, 87µm) is higher than that of commercially available polyimide film, Kapton HN (3.50, 125µm, 1 kHz). This poly(pyridine-imide) also has a higher dielectric constant than the polyimides (3.05, 87 µm, 1 kHz;373.58, 74 µm, 1 kHz)38 derived from 6FDA. The result of higher dielectric constant is due to the presence of aryl-substituted pyridine heterocylic group and π-conjugation of pyrene structure in the polymer backbone, which increased the polarizability of the polymer under electric field.
The morphology of the poly(pyridine-imide) was observed by scanning electron micrographs (SEM). Thin films were obtained by depositing a drop of the polymer solutions onto a glass slide. The SEM micrograph of poly(pyridine-imide) from THF reveal that the surface of polymer is homogeneous with irregular shaped granules that are neatly packed close to each other (Figure 7a). For comparison with the protonated polymer, we also prepared SEM sample by the same way from a THF/
HCl (1.0 M) solution of the poly(pyridine-imide), as shown in Figure 7b, which clearly exhibited a large size of granules.
This may be attributable to the interaction of poly(pyridine-imide) and HCl which resulted in aggregation of the polymer.
was successfully prepared. The obtained poly(pyridine-imide) exhibits good solubility in common organic solvents, such as THF, DMAc, DMF, NMP, etc. The poly(pyridine-imide) possessed a high dielectric constant and showed good ther-mooxidative stability higher than 500 °C and excellent me-chanical properties. This investigation showed that the polymer possessed blue emission in neutral solution and orange emission after protonation. After protonation with protic acid, the poly-(pyridine-imide) exhibited a bathochromic shift. These char-acteristics indicate that pyrene-containing poly(pyridine-imide) is a promising material for optoelectric applications.
Acknowledgment. The authors thank the National Science Council (NSC) of the Republic of China for support of this work.
Figure 6. Emission spectra of poly(pyridine-imide) as a function of HCl concentration.
Figure 7. SEM of poly(pyridine-imide) depositing a drop of the polymer solutions onto a glass slide: (a) THF as solvent and (b) THF/
HCl (1.0 M) as solvent.
Macromolecules, Vol. 40, No. 10, 2007 Novel Organosoluble Poly(pyridine-imide) 3573
Supporting Information Available: Figures showing NMR spectra and cyclic voltammogram. This material is available free of charge via the Internet at http://pubs.acs.org.
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MA062546X
3574 Liaw et al. Macromolecules, Vol. 40, No. 10, 2007
Ring-Opening Metathesis Polymerization of New Norbornene-Based Monomers Containing Various Chromophores
DER-JANG LIAW,1KUN-LI WANG,2KUEIR-RARN LEE,3JUIN-YIH LAI3
1Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
2Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan
3R&D Center for Membrane Technology, Chung-Yuan University, Chung-Li, Taiwan
Received 6 June 2006; accepted 17 September 2006 DOI: 10.1002/pola.22056
Published online in Wiley InterScience (www.interscience.wiley.com).
ABSTRACT: Pure exo-functional norbornene monomers containing various chromo-phores such as fluorene, pyrene, and carbazole were successfully prepared via the
ABSTRACT: Pure exo-functional norbornene monomers containing various chromo-phores such as fluorene, pyrene, and carbazole were successfully prepared via the