Study of Crystallinity of Poly (ethylene terephthalate)——Ⅲ.Melting Point and Heat of Fusion

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Study of Crystallinity of Poly (ethylene terephthalate)——Ⅲ.Melting Point and Heat of Fusion

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- Study of Crystallinity of Poly (ethylene terephthalate)——Ⅲ.Melting Point and Heat of Fusion
- Acta Scientiarum Naturalium Universitatis SunYatseni Vol. 25, Issue 1, Pages: 43-49(1986)
- 作者机构：
  
  中山大学高分子研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：1986，
  
  Published Online：25 January 1986，
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Study of Crystallinity of Poly (ethylene terephthalate)——Ⅲ.Melting Point and Heat of Fusion. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 25(1):43-49(1986)
DOI：

Study of Crystallinity of Poly (ethylene terephthalate)——Ⅲ.Melting Point and Heat of Fusion. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 25(1):43-49(1986) DOI：

摘要

研究了涤纶(PET)及其共聚酯的熔点和熔化热

结果表明:①在平衡熔点以下温度

PET 熔体结晶并形成高熔点结晶

平衡熔点可用结晶温度(T_c)和熔点(T_m)关系

或用共聚酯的T_m 和第三组分含量关系外推得到.②PET 共聚物的熔化热随第三组分的分子结构和添加量而变

因此

Flory 理论须作修正。纯PET 的ΔH 与外推到第三组分含量为零时的共聚酯的ΔH 之差

可作为第三组分对共聚酯分子间相互作用影响大小的表征.

Abstract

Melting point and heat of fusion of PET and its copolymers are studied.Theresults show that:(1)at temperature below its equilibrium melting point

PETmelt can crystallize and form crystals with high melting point.Equilibrium meltingpoint can be measured by relations of T_c and melting points or relations of mel-ting points of copolyesters and percentage of the third component;(2)heat of fu-sion of PET copolymers varys with the molecular structure of additive third com-ponent and its amount.Therfore

Flory’s theory must be corrected

since it didnot take accout of the effect of molecular structure of the third component on themolecular interreaction of polyester.This effect can be characterized by the dif-ferentia of heat of fusion of pure PET and that of copolyester when extraprola-ted to zero fraction of the third component.

关键词

熔点第三组分熔解温度熔化热热力学性质涤纶树脂结晶度结晶性能

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Study oF Crystallinity of Poly(ethylene terephthalate)——Ⅰ.Effect of“Impurity”on the Crystallinity of Terylene

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