Microstructure and Thermal and Rheological Properties of Low-Molecular-Mass Ethylene-Vinyl Acetate Copolymer

被引：0
|
作者：
Morontsev, A. A. [1 ]
Karpov, G. O. [1 ]
Ilyin, S. O. [1 ]
Dement'ev, K. I. [1 ]
Bermeshev, M. V. [1 ]
机构：
[1] Russian Acad Sci, Topchiev Inst Petrochem Synth, Moscow 119991, Russia
来源：
RUSSIAN JOURNAL OF APPLIED CHEMISTRY | 2023年 / 96卷 / 01期
关键词：
ethylene-vinyl acetate copolymer; microstructure; thermal properties; rheological properties; microphase segregation; POLYETHYLENE; CHAIN;
D O I：
10.1134/S107042722301010X
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The microstructure of low-molecular-mass ethylene-vinyl acetate copolymers was studied by H-1 and C-13 NMR spectroscopy. The vinyl acetate mole fraction, chain branching, and mean lengths of ethylene and vinyl acetate blocks were determined. The thermal properties of ethylene-vinyl acetate copolymers were studied by differential scanning calorimetry and thermogravimetric analysis, and the crystalline characteristics, by X-ray diffraction analysis. The degree of crystallinity of the copolymer decreases with an increase in the fraction of the polar comonomer. Rheological studies show that ethylene-vinyl acetate copolymers at room temperature tend to microphase segregation and form a microphase structural network.
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页码：73 / 82
页数：10
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