期刊
ACS OMEGA
卷 5, 期 30, 页码 19247-19254出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c02815
关键词
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资金
- National Natural Science Foundation of China [21704008]
- Natural Science Research Project of Jiangsu Higher Education Institutions [19KJB430041]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP)
- Talent Plan for Innovation and Entrepreneurial Doctor in Jiangsu Province
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX20_2532]
In this work, poly(ethylene terephthalate) (PET) chain-extending products with different molecular weights were prepared by reactive extrusion using isocyanate trimer (C-HK) as the trifunctional chain extender. The effect of the chain extender C-HK on the intrinsic viscosity, melt flow property, crystallization behavior, crystallization morphology, and mechanical property of PET was investigated. The results showed that when the content of the chain extender was increased from 0.6 to 1.4 wt%, the viscosity average molecular weight of PET was effectively increased from 2.36 x 10(4) to 5.46 x 10(4) g.mol(-1). After the chain extending, the crystallinity and the time of semicrystallization of PET were significantly decreased. After the isothermal crystallization at 220 degrees C for 5 min, the spherulites formed by pure PET became larger. With the increase in molecular weight of PET after chain extension, its spherulite size was significantly decreased without changing the crystalline structure. The chain-extended PET also exhibited more excellent bending-resistant and impact-resistant properties. While the tensile strength of PET after chain extension was slightly decreased, the bending strength was increased by a maximum value of 56.8%, and the impact strength was increased by a maximum value of five times.
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