PET/EN-MFMB增韧体系非等温结晶及熔融行为

用差热分析法研究了PET／EN-MFMB增韧体系逐渐升温和逐渐降温的结晶行为以及逐渐升温的熔融行为。结果表明:PET／EN-MFMB增韧体系中PET冷、热结晶开始结晶温度均比原料PET的有所降低,热结晶成核速率均比原料PET的有明显提高。HDPE的结晶过程受到了PET的阻隔、约束作用。PET结晶开始熔融温度一般都比原料PET 有所提高;HDPE结晶熔融峰顶温度比原料HDPE以及EN-MFMB中的HDPE的明显降低。

Non-isothermal Crystallization and Melting Behaviors of Toughened PET/EN-MFMB System

The programmed heating and cooling crystallization behavior and melting behavior of toughened PET/EN-MFMB system were investigated by means of DTA. The results indicated that the PET in PET/EN-MFMB showed lower cold and hot crystallization onset temperature, and a marked higher hot crystallization nucleation rate than that of pure PET. The crystalline process of HDPE was obstructed and restricted by PET. For the melting behavior, the initial melting temperature of PET crystal in PET/EN-MFMB was higher commonly than that of pure PET; the melting peak temperature of HDPE crystal in PET/EN-MFMB decreased distinctly compared with that of pure HDPE and that of HDPE in EN-MFMB.