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首页> 外文期刊>Journal of Applied Polymer Science >Chain extension of poly(ethylene terephthalate) by reactive blending using diepoxides
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Chain extension of poly(ethylene terephthalate) by reactive blending using diepoxides

机译：聚对苯二甲酸乙二醇酯通过双环氧反应共混扩链

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摘要

Molecular weight increase via chain extension reactions of poly(ethylene terephthalate) with commercially available diepoxides was studied in a custom-made laboratory scale reactor and a Brabender rheomixer under reactive blending conditions. The products were characterized by carboxylic end group analysis, intrinsic viscosity, and differential scanning calorimetry. PET was effectively modified in the laboratory-scale reactor using cyclic diepoxides because the resulting polymers show intrinsic viscosities that are comparable to virgin PET (0.68-0.75 dL/g vs. 0.74 dL/g) and much higher than processed PET (0.55), while carboxyl contents were reduced to a third of that of the virgin PET. Diglycidyl ethers produced polymers displaying decreased viscosity values, increased carboxyl content, and lower melting points. Low concentrations of extender and short reaction times generally favored chain extension. In addition, purging with nitrogen resulted in chain extended polymers having the highest values of intrinsic viscosity ([η] = 0.79, 0.82). Similar trends were observed with modified products in the rheomixer having somewhat smaller viscosity values, larger carboxyl contents, and increased melting points.
机译：在反应混合条件下，在定制实验室规模的反应器和Brabender流变混合器中研究了聚对苯二甲酸乙二酯与市售双环氧化合物通过扩链反应增加的分子量。通过羧基端基分析，特性粘度和差示扫描量热法对产物进行表征。在实验室规模的反应器中，使用环状二环氧化合物对PET进行了有效的改性，因为所得的聚合物显示出的特性粘度与纯PET相当（0.68-0.75 dL / g对0.74 dL / g），远高于加工的PET（0.55），而羧基含量减少到原始PET的三分之一。二缩水甘油醚制得的聚合物显示出降低的粘度值，增加的羧基含量和更低的熔点。低浓度的增量剂和较短的反应时间通常有利于链增长。另外，用氮气吹扫得到具有最高特性粘度值的扩链聚合物（[η] ＝ 0.79，0.82）。在流变混合器中，改性产物具有类似的趋势，该改性产物具有稍小的粘度值，较大的羧基含量和增加的熔点。

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