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Synthesis and characterization of poly(ethylene terephthalate-co-isophthalate)s with low content of isophthalate units

机译:间苯二甲酸酯单元含量低的聚对苯二甲酸乙二醇酯-共间苯二甲酸酯的合成与表征

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The objective of this work was to study the effect of the introduction of low amounts of isophthalate units on the mechanical properties, crystallization rates, and thermal parameters of poly(ethylene terephthalate). For this reason a series of five random poly(ethylene terephthalate-co-isophthalate) copolymers, containing 0.5, 1, 1.5, 2, and 4 mol % isophthalic acid, were prepared by the melt polycondensation process. The intrinsic viscosity of copolymers ranged between 0.7 and 0.8 dL/g. The increase of isophthalate content resulted in a significant decrease of the crystallization rates, but in a small decline of tensile strength, Young's modulus, and elongation at break, whereas tensile strength at yield point remained almost unaffected. Also, a decrease in the melting point was recorded, whereas the glass-transition temperature was only very slightly affected. The higher decrease for the aforementioned parameters was noted for the copolymer with 4 mol % isophthalate units content. (C) 2002 Wiley Periodicals, Inc. [References: 38]
机译:这项工作的目的是研究引入少量间苯二甲酸酯单元对聚对苯二甲酸乙二醇酯的机械性能,结晶速率和热学参数的影响。因此,通过熔融缩聚工艺制备了一系列五种无规的聚(对苯二甲酸乙二酯-共-间苯二甲酸酯)共聚物,它们分别包含0.5、1、1.5、2和4 mol%的间苯二甲酸。共聚物的特性粘度在0.7至0.8dL / g之间。间苯二甲酸酯含量的增加导致结晶速率显着降低,但抗拉强度,杨氏模量和断裂伸长率略有下降,而屈服点的抗拉强度几乎未受影响。另外,记录到熔点的降低,而玻璃化转变温度仅受到很小的影响。对于具有4mol%间苯二甲酸酯单元含量的共聚物,注意到上述参数的较高降低。 (C)2002 Wiley Periodicals,Inc. [参考:38]

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