Morphology and linear rheology of comb-like copolymer melts with high grafting density: I. PVSt-g-(PS-b-PE) comb-like block copolymers
Morphology and linear rheology of comb-like copolymer melts with high grafting density: I. PVSt-g-(PS-b-PE) comb-like block copolymers
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高接枝密度梳状共聚物熔体的形貌和线性流变：I. PVSt-g-(PS-b-PE)梳状嵌段共聚物
DOI：
10.1016/j.polymer.2017.06.049
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发表时间：
2017-07
期刊：
影响因子：
4.6
通讯作者：
Tang Tao
中科院分区：
文献类型：
--
作者：
Lin Yichao;Gu Yang;Chen Zi'an;Zhang Shaofeng;Zhang Guangchun;Wang Yanhui;Xing Haiping;Tang Tao
采用“接枝”策略成功合成了高接枝密度的梳状嵌段共聚物PVSt-g-（PS-b-PE）（PVSt：聚（4-（乙烯基苯）-1-丁烯））。PVSt-g-（PS-b-PE）的接枝密度为35-39%（每100个主链重复单元的分支链数）。通过在侧链中引入PS嵌段，可以调节共聚物中PS的总体积分数，探讨PS总组分（PVSt主链+ PS嵌段）的体积分数对共聚物的熔融形态和线性流变响应的影响。与先前工作中具有类似接枝密度的PSVS-g-PE共聚物（Macromolecules，2015，48，7640）相比，PVSt-g-（PS-b-PE）共聚物在熔融状态下显示出微相分离结构。梳状嵌段共聚物中总PS的体积分数决定了形态的类型。当PS的体积分数从11%变化到55%时，微相分离结构由无序球形结构转变为无序片层结构，PVSt-g-（PS-b-PE）均表现出典型的网络状结构流变行为。同时，随着PS含量的增加，G ′曲线和G ″曲线在中频处的距离也越来越远。其原因是PVSt-g-（PS-b-PE）体系中形成了不同的微相分离结构类型。
Comb-like block copolymers PVSt-g-(PS-b-PE) (PVSt: poly(4-(vinylpheneyl)-1-butene)) with high grafting density were successfully synthesized based on “Graft onto” strategy. The grafting density of PVSt-g-(PS-b-PE) was 35–39% (branch chain number per 100 repeating units of the backbone). By introducing PS block in the side chains, the total PS volume fraction in the copolymers could be adjusted to explore the influence of the volume fraction of total PS component (PVSt backbone + PS block) on morphology (at melt state) and linear rheological response of the copolymers. Compared to PSVS-g-PE copolymers with similar grafting density in the previous work (Macromolecules, 2015,48, 7640), PVSt-g-(PS-b-PE) copolymers showed a microphase-separated structure at the melt state. The volume fraction of total PS in the comb-like block copolymers determined the type of morphology. When the volume fraction of PS changed from 11% to 55%, the microphase-separated structure changed from poor-order spherical structure to poor-order lamellar morphology, and all the samples of PVSt-g-(PS-b-PE) showed a typical rheological behavior of network-like structure. At the same time, theG′curve andG″ curve were more away from each other at intermediate frequency with the increasing of PS content. The reason resulted from the formation of different microphase-separated structure types in the PVSt-g-(PS-b-PE).
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