Improvement of Poly(ethylene terephthalate) Melt-Foamability by Long-Chain Branching with the Combination of Pyromellitic Dianhydride and Triglycidyl Isocyanurate

被引：61

作者：

Ge, Yukai ^{[1
]}

Yao, Shun ^{[1
]}

Xu, Menlong ^{[1
]}

Gao, Liang ^{[1
]}

Fang, Zhiying ^{[1
]}

Zhao, Ling ^{[1
,2
]}

Liu, Tao ^{[1
]}

机构：

[1] East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China

[2] XinJiang Univ, Sch Chem & Chem Engn, Urumqi 830046, Peoples R China

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2019年 / 58卷 / 09期

关键词：

LOW-DENSITY POLYETHYLENE; MOLECULAR-WEIGHT DISTRIBUTION; RELAXATION-TIME SPECTRA; ELONGATIONAL VISCOSITY; RHEOLOGICAL PROPERTIES; RECYCLED PET; STRENGTH; EXTRUSION; POLYPROPYLENE; EXTENSION;

D O I：

10.1021/acs.iecr.8b04157

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Reactive processing on conventional poly(ethylene terephthalate) (PET) with the combination of pyromellitic dianhydride (PMDA) and triglycidyl isocyanurate (TGIC) was used to produce long-chain branched PET (LCB-PET). The branching factors of the PET samples were correlated from their intrinsic viscosity and molar mass results. In all PET samples without a cross-linked structure, PET modified with 0.1 wt % PMDA and 0.5 wt % TGIC (PET-P1T5) had the highest branching degree, with a branching factor of 0.84. The relaxation time spectra of the three modified PET samples with strain-hardening behaviors displayed rubbery states during the relaxation process, which was ascribed to their increased molecular weight or long-chain branched structure. Batch melt-foaming experiments with CO2 were carried out to evaluate the melt-foamability of PET. The results indicated that both a high molecular weight and long-chain branched structure, especially the latter, could efficiently lead to strong molecular entanglements and significantly improve the polymer melt-foamability.

引用

页码：3666 / 3678

页数：13

共 60 条

[11] Molecular and structural analysis of a triepoxide-modified poly(ethylene terephthalate) from rheological data [J].