Nanostructure and Linear Rheological Response of Comb-like Copolymer PSVS-g-PE Melts: Influences of Branching Densities and Branching Chain Length

Nanostructure and Linear Rheological Response of Comb-like Copolymer PSVS-g-PE Melts: Influences of Branching Densities and Branching Chain Length
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梳状共聚物 PSVS-g-PE 熔体的纳米结构和线性流变响应:支化密度和支化链长度的影响

DOI:
10.1021/acs.macromol.5b01335
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发表时间:
2015-10
期刊:
影响因子:
5.5
通讯作者:
Xu Donghua
Xu Donghua
中科院分区:
化学1区
文献类型:
--
作者:
Lin Yichao;Wang Yanhui;Zheng Jun;Yao Kun;Tan Haiying;Wang Yaotao;Tang Tao;Xu Donghua

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合成了不同支化参数的梳状聚(苯乙烯-co-4-(乙烯基苯基)-1-丁烯)-g-聚乙烯共聚物(PSVS-g-PE),研究了分支链对共聚物熔体形态和线性流变性能的影响。结果表明,PSVS-g-PE共聚物的支化密度和分支链长均对共聚物的线性流变行为有显著影响,这是由于在熔体状态下形成了不同的微相分离结构所致。具有低支化密度(2.3-3.5个分支链/100个主链重复单元)的PSVS-g-PE共聚物在熔融状态下表现出微相分离结构,并观察到典型的网络状结构的流变特性。此外,在熔融状态下的微相分离结构的类型强烈影响的时间-温度叠加(TTS)原则的适用性。结果表明,PSVS 52.7 -3.5- 1.5的模量曲线出现TTS破坏。
Comb-like poly(styrene-co-4-(vinylphenyl)-1-butene)-g-polyethylene copolymers (PSVS-g-PE) with various branching parameters were synthesized to study the influence of branch chains on morphology (at melt state) and linear rheological response of the copolymers. The results showed that both the branching density and branch chain length of PSVS-g-PE copolymers strongly affected linear rheological behavior of the copolymers, resulting from the formation of different microphase separation structure in the melt state. PSVS-g-PE copolymers with low branching density (2.3–3.5 branch chains per 100 repeating units of the backbone) showed a microphase-separated structure at the melt state, and a typical rheological characteristic for network-like structure was observed. Furthermore, the type of microphase-separated structure at the melt state strongly influences the applicability of the time–temperature superposition (TTS) principle. As a result, the TTS failure was observed in the modulus curves for PSVS52.7-3.5-...
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