[PDF] Top 20 The kinetics of transesterification in blends of liquid crystalline copolyester and polycarbonate

... It was found that the activation energy for the transesterification reaction between the poly(oxybenzoate) segment in copoly(oxybenzoate-ethylene terephthalate) and po[r] ... See full document

... Thermotropic liquid crystalline polymers (TLCPs) had attracted a great deal of attention since their ...tures and therefore possessed unique properties such as low melt viscosity and ... See full document

... by the solution method will be- come completely phase separated when the blend is heated up to the melt ...state. The amorphous the two T g s will shift toward each other. In ... See full document

... Therefore, the ester ex- one assumed that the phosphate inhibitor was change took place between the P E T segment and dispersed homogeneously in the blend. Then, the the P[r] ... See full document

... The miscibility of the blends at different compositions and blending time was investigated with differential scanning calorimetry.. The corresponding morphology of the blends was a[r] ... See full document

... ABSTRACT: The kinetics of the ester–amide exchange in solution blends of the random liquid-crystalline polyester copoly(oxybenzoate-terephthalate) ... See full document

... 20. The polymer solutions were then cast onto glass slides and were dried under vacuum at 100 °C for 72 h in an oven for removing the ...solvent. The thermal gravimetric analysis ... See full document

... ABSTRACT: Blends of liquid crystalline poly ( oxybenzoate- co-oxynaphthalate ) ( Vectra A950 ) and polycarbonate ( PC ) were prepared by adding a compatibilizer to the two ... See full document

... number of polymer crystals thicken either isothermally at T c or upon heating to the melting temperature, the lamellar thickness at the time of melting, l, may be greater than ... See full document

... Therefore, by adding a second semi-rigid liquid crystalline copolyester which being even partially miscible with the amorphous matrix polymer polyetherimide would enhan[r] ... See full document

... Our goal is to achieve compatible LCP blends, and our approach is to develop a compatibilizer based upon the transesterification between the matrix polymer and a[r] ... See full document

... In our previous study on PC-epoxy blends cured by tertiary amine, the transesterification reaction converted the original aromatic/aromatic carbonate into aromatic/ a[r] ... See full document

... These amorphous polymers exhibited a single glass transition temperature higher than that for both pure polymers.. Q 1997 Elsevier Science Ltd.[r] ... See full document

... The concepts of compatibilizing an immiscible and incompatible thermoplastic polymer blend are well established. An effectively compatibilized blend can usually result[r] ... See full document

... With the stoichiometric composition of the PC-epoxy blend which may be cured by transesterification reaction, a network of crosslinked chain will be formed with carbonate grou[r] ... See full document

... decrease the curing rate. Yu and Bell 5 studied PC-epoxy blends cured by quaternary ammonium salts and reported that a reac- tion occurred between epoxide and polycarbonate, ... See full document

... Institute of Chemical Engineering, National Tsing Hua University, Hsinchu, 30043, Taiwan Received 29 November 1996; revised 26 February 1997; accepted 27, 1997 ABSTRACT: Reaction mechanism of the PC ... See full document

... Higher PC molecular weight results in lower DBTT and greater fracture strength in both ductile and brittle modes. This result is not unexpected if we compare them with virgin PC wi[r] ... See full document

... Unfortunately, most of the compatibilized TP/LCP blends tend to hinder LCP fibril formation, due to a lower interfacial tension and finer dispersed phase domains, [r] ... See full document

... for the PAr/LCP blends in this study. TGDDM has the chance to react with PAr and LCP at the interface simultaneously to produce the PAr-co-TGDDM-co-LCP mixed copolymers ... See full document