聚對苯二甲酸二乙酯(PET，polyethylene terephthalate)具有高機械強度、耐化學溶劑等特性。然而PET熔點相當高，需要較高的加工溫度。聚對苯二甲酸二丙酯(PPT，polypropylene terephthalate)的熔點比PET低，而且化學結構與PET相近，與PET的相容性佳。若以PPT改質PET形成PPT/PET共聚酯以降低PET的熔點，將有助於改善PET的加工性。
本研究探討不同合成反應條件及反應進料組成對PPT/PET共聚酯結構與性質的影響。熱分析結果顯示，不同反應條件與組成所得到的共聚酯均為均勻相。以13C-NMR分析順序結構(sequence)分佈結果顯示共聚酯為random共聚酯。可能是酯交換反應使得共聚酯的分子結構排列趨向於形成random 共聚酯。以X-射線繞射分析結果顯示PPT/PET共聚酯的結晶結構大致可以分為三類，當PPT/PET共聚酯的組成接近PET時，其結晶結構與PET均聚酯的結晶結構相似；當組成接近PPT時，其結晶結構與PPT均聚酯的結晶結構相似；當PPT含量約為50 mol%時，PPT/PET共聚酯的結晶結構與PET均聚酯及PPT均聚酯的結晶結構均完全不同。由微差掃描式熱分析儀(DSC, differential scanning calorimetry)分析結果顯示，當PPT/PET共聚酯的PPT含量在小於10 mol%或大於70 mol%範圍內時，PPT/PET共聚酯結晶速率明顯較快，PPT/PET共聚酯的玻璃轉移溫度(Tg )隨PPT含量增加而降低，熔點(Tm )則先降低至PPT含量約為50 mol%時再增加。

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