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在温度280℃附近对含有液晶共聚酯P-Hydroxy Benzoic Acid/Poly(-Ethylene Terephthalate-)PHB/PET和Poly(-Ethylene Terephthalate-)PET的共混样品进行热处理时,发现共混物的熔点随热处理的时间增加而不断降低,热处理温度越高,相同时间内共混物熔点下降程度越大;而具有相同热历史的纯PET样品熔点几乎保持不变.通过NMR方法证实了PHB/PET-TET共混物熔点随热处理时间下降是由于PHB/PET和PET之间发生了酯交换反应.所以可根据共混物的宏观热性质和PHB/PET序列结构变化表征PHB/PET和PET共混物之间的酯交换程度.
When the blend sample containing the liquid crystal copolyester P-Hydroxy Benzoic Acid / Poly (-Ethylene Terephthalate-) PHB / PET and Poly (-Ethylene Terephthalate-) PET was heat-treated at a temperature of about 280 ° C, it was found that the melting point With the increase of heat treatment time, the melting point of the blend decreases with the increase of the heat treatment temperature, while the melting point of the pure PET sample with the same heat history almost remains unchanged. The results show that the PHB / PET- The melting point of TET blend decreases with the heat treatment time due to the transesterification reaction between PHB / PET and PET, so PHB / PET and PET blends can be characterized according to the macroscopic thermal properties of the blends and the structural changes of PHB / PET sequences The degree of transesterification between.