Propriedades elétricas e físico-químicos de blendas de poli (sulfeto de p-fenileno) - pps com um cristal líquido polimérico (LCP) / Electrical and physical chemistry properties of poli (p-phenylene sulfide) with a liquid crystal polymer

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

Poly (p-phenylene sulphide) (PPS) is an engineering thermoplastic, with high thermal and chemical resistance, and. with a growing industrial importance, due to its easy processability in the form of films, fiaments and injection molded articles. It also can be chemically doped and. therefore be a conductive polymer (σ = 10 S/cm, by doping with AsF5); however, when doping with strong oxidative agents, its morphology is destroyed. In this work, PPS was doped with a weaker doping agent, tetracyanoquinodimethane (TCNQ) in order to preserve its initial morphology and to study its influence on the final conductivity values. Different PPS/TCNQ morphologies were produced by varying the processing conditions. It was also studied the influence the blending of PPS/TCNQ with a liquid crystalline polymer (LCP) has on the microstructure and orientation of the PPS and on its conductivity. It was observed that this addition has a negative effect on the PPS conductivity. Orientation of the PPS by the LCP was only achieved at 80% wt LCP. It was concluded that, for the PPS, the major influence on its electrical conductivity is given by its amount of crystallinity, not by its orientation. The conduction mechanism of the PPS and its blends with the LCP doped with TCNQ is a hopping mechanism.

ASSUNTO(S)

polímeros concuctors polymers liquid crystal polymeric cristal líquido polimerico polímeros condutores

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