Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Liquid crystalline polymers thermal behaviour

The thermal behaviour of liquid crystalline main-chain polymers is more complicated. In most cases, samples show a glass transition (positive ACp), melting (endotherm) and mesophase-mesophase and/or mesophase-isotropic liquid transitions (endotherms). Quickly cooled samples may... [Pg.136]

Studies on the melt behaviour of the aromatic copolyesters of poly(ethylene terephthalate) and / -acetoxybenzoic acid have been reported previously. Baird and co-workers have examined the rheological properties of the 40/60 and 20/80 (PET/PHBA) copolyester compositions over a wide temperature range and observed that the melt viscosity of both copolyester compositions was significantly lower than that of poly(ethylene terephthalate) and dependent on the composition of the copolyester. Wissbrun has also studied the flow properties of liquid-crystalline behaving polymers and observed that the flow curves of the 40/60 (PET/PHBA) copolyester composition are very sensitive to the temperature of the melt and its thermal history. In our studies " we observed that the 20/80 (PET/PHBA) copolyester is a block copolymer in which the PHBA blocks aggregate in crystalline domains in contrast to PET/PHBA copolyesters with lower fractions of PHBA which are reported to be random copolymers. [Pg.183]


See other pages where Liquid crystalline polymers thermal behaviour is mentioned: [Pg.56]    [Pg.216]    [Pg.48]    [Pg.278]    [Pg.238]    [Pg.43]    [Pg.180]    [Pg.43]    [Pg.279]    [Pg.43]    [Pg.37]    [Pg.596]    [Pg.597]    [Pg.598]    [Pg.78]    [Pg.440]    [Pg.136]    [Pg.132]    [Pg.115]   
See also in sourсe #XX -- [ Pg.117 ]




SEARCH



Crystalline behaviour

Liquid crystalline polymers

Liquids, behaviour

Polymers liquid crystallinity

Thermal behaviour

© 2024 chempedia.info