Rheology and Foaming of Long-Chain Branched Ethylene-Tetrafluoroethylene Copolymer and Its Blends
Rheology and Foaming of Long-Chain Branched Ethylene-Tetrafluoroethylene Copolymer and Its Blends
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DOI：
10.3139/217.3468
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发表时间：
2018-04
影响因子：
1.3
通讯作者：
E. Nishi;T. Satou;S. K. Sukumaran;T. Katou;M. Sugimoto;K. Koyama
中科院分区：
文献类型：
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作者：
E. Nishi;T. Satou;S. K. Sukumaran;T. Katou;M. Sugimoto;K. Koyama
以乙烯、苯乙烯、三元共聚物和少量二乙烯基单体为原料，通过自由基聚合合成了长支链乙烯-四氟乙烯共聚物（B-ETFE）。研究了B-ETFE在剪切和拉伸条件下的熔体流变性，并与传统线型ETFE进行了比较。少量二乙烯基单体的加入对ETFE及其共混物的熔体流变性能有较大影响。所观察到的非线性拉伸行为和长弛豫时间组分的出现可以通过改性ETFE中的长链支化来解释。B-ETFE及其共混物具有优异的发泡加工性能：泡孔尺寸均匀、较小，泡孔数密度比线型ETFE高得多。据我们所知，这是第一次报告的增强ETFE的熔体流变学的观点，其分子结构的修改。
Abstract The long-chain branched ethylene-tetrafluoroethylene copolymer (B-ETFE) was synthesized by radical polymerization using ethylene, tetrafluoroethylene, termonomer, and a very small amount of divinyl monomer. We studied melt rheology under shear and elongational flow, and foamability for B-ETFE, comparing with conventional linear ETFE. Addition of a small amount of the divinyl monomer had a considerable impact on the melt rheology of ETFE and its blends. The observed non-linear elongational behavior and emergence of long relaxation time components can be explained by long-chain branching in the modified ETFE. B-ETFE and its blends showed excellent foaming processability: uniform and smaller cell sizes and much higher cell number densities than those of linear ETFE. To the best of our knowledge, this is the first report of the enhancement of the melt rheology of ETFE from the viewpoint of modification of its molecular architecture.