Blend of Liquid Crystalline Polyester and Polycarbonate.

The Role of Transesterification on the Miscibility in Blends of Polycarbonate and Liquid Crystalline Copolyester

Transesterification mechanisms and rate in blends of polycarbonate (PC) and random liquid crystalline polyester copoly(oxybenzoate-p-terephthalate) at molar ratio 40/60 (P46) were studied through a five-component diad analysis and with 13C and 1H-13C nuclear magnetic resonance spectroscopy. It was found that the ester-ester interchange in the two polymers took place within 15 min when the blend...

Interactions of a liquid crystalline polymer with polycarbonate and poly(ethylene terephthalate)

Thermal behaviour of blends of a liquid crystalline copoly(ester amide) (Vectra B950) with two isotropic polymers has been studied by differential scanning calorimetry. One of the isotropic polymers is an amorphous polymer — polycarbonate, the other is a semi-crystalline polymer — poly(ethylene terephthalate). It was found that the glass transition temperature of polycarbonate decreases with in...

Mechanical properties of in situ composites based on polycarbonate and a liquid crystalline polymer

The mechanical properties of in situ composites based on blends of polycarbonate and a liquid crystalline copoly(ester amide) (Vectra B950) have been studied as functions of the liquid crystalline polymer (LCP) concentration and the draw ratio, a processing parameter. It is shown that both the elastic modulus and the tensile strength of the in situ composites increase steadily with the LCP conc...

High diffraction efficiency polarization gratings recorded by biphotonic holography in an azobenzene liquid crystalline polyester

New All-aromatic Liquid Crystalline Polyester Thermosets with High Glass-Transition Temperatures for Composite Applications

Wholly aromatic thermotropic liquid crystalline polymers (TLCPs) are an important class of high-performance materials, which offer a combination of excellent thermal and mechanical properties. TLCPs can be processed from the nematic melt into high-modulus fibers, films and molded articles. However, despite their all-aromatic composition, main-chain TLCPs exhibit low glass transition temperature...