Morphology and Deformation Mechanisms and Tensile Properties of Tetrafunctional Multigraft Copolymers
Morphology and Deformation Mechanisms and Tensile Properties of Tetrafunctional Multigraft Copolymers
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DOI：
10.1021/ma900414h
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发表时间：
2009-05
期刊：
影响因子：
5.5
通讯作者：
Yongxin Duan;M. Thunga;Ralf Schlegel;K. Schneider;E. Rettler;R. Weidisch;H. Siesler;M. Stamm
中科院分区：
文献类型：
--
作者：
Yongxin Duan;M. Thunga;Ralf Schlegel;K. Schneider;E. Rettler;R. Weidisch;H. Siesler;M. Stamm
研究了四官能多接枝 (MG) 聚苯乙烯-g-聚异戊二烯 (PS-g-PI) 共聚物的形态、变形机制和拉伸性能与 PS 体积分数和支化点数量的关系。 TEM、实时同步加速器 SAXS、流变光学 FTIR 和拉伸测试等多种方法的结合提供了不同维度水平的全面信息。 TEM 和 SAXS 研究表明，支化点的数量对含 16 wt% PS 的四官能 MG 共聚物的微相分离形貌没有明显影响。但对于含有 25 wt% PS 的四官能 MG 共聚物，PS 微域的尺寸和完整性随着支化点数量的增加而降低。 MG共聚物的变形机制与形态高度相关。根据 PS 相的微相分离形态和完整性，PS 相的应变诱导取向具有不同的尺寸尺度。偏振 FT-IR 光谱分析表明，对于所有研究...
Morphology and deformation mechanisms and tensile properties of tetrafunctional multigraft (MG) polystrene-g-polyisoprene (PS-g-PI) copolymers were investigated dependent on PS volume fraction and number of branch points. The combination of various methods such as TEM, real time synchrotron SAXS, rheo-optical FTIR, and tensile tests provides comprehensive information at different dimension levels. TEM and SAXS studies revealed that the number of branch points has no obvious influence on the microphase-separated morphology of tetrafunction MG copolymers with 16 wt % PS. But for tetrafunctional MG copolymers with 25 wt % PS, the size and integrity of PS microdomains decrease with increasing number of branch point. The deformation mechanisms of MG copolymers are highly related to the morphology. Dependent on the microphase-separated morphology and integrity of the PS phase, the strain-induced orientation of the PS phase is at different size scales. Polarized FT-IR spectra analysis reveals that, for all inves...