Effect of monomer composition on the rheological properties of poly(p-oxybenzoate-co-ethylene terephthalate)s |
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| Authors: | K Fujiwara M Takahashi T Masuda |
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| Affiliation: | (1) Polymer Research Laboratory, 1-1 Anesaki-kaigan, 299-01 Ichihara, Chiba, Japan;(2) Department of Polymer Chemistry, Kyoto University, 606 Kyoto, Japan;(3) Research Center for Biomedical Engineering, Kyoto University, 606 Kyoto, Japan |
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| Abstract: | Summary Effect of monomer composition on the dynamic viscoelastic properties and the steady flow properties of thermotropic liquid crystalline poly (p-oxybenzoate-co-ethylene terephthalate)s in the fluid state have been investigated as compared with the isotropic melt of the copolyester including 28 mol% p-oxybenzoate unit (POB). The liquid crystalline copolyesters show the rheological transition temperature, which increases with increasing the content of POB unit. Above the transition temperature, all the thermotropic copolyesters exhibit much higher compliance and much more shear-thinning behavior of the apparent viscosity than the isotropic melt of the non-liquid crystalline copolyester. |
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