Morphology and tensile properties of multigraft copolymers with regularly spaced tri-, tetra-, and hexafunctional junction points
Morphology and tensile properties of multigraft copolymers with regularly spaced tri-, tetra-, and hexafunctional junction points
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DOI：
10.1021/ma060067s
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发表时间：
2006-05
期刊：
影响因子：
5.5
通讯作者：
Yuqing Zhu;Engin Burgaz;S. Gido;U. Staudinger;R. Weidisch;David M Uhrig;J. Mays
中科院分区：
文献类型：
--
作者：
Yuqing Zhu;Engin Burgaz;S. Gido;U. Staudinger;R. Weidisch;David M Uhrig;J. Mays
使用透射电子显微镜 (TEM)、小角 X 射线散射 (SAXS) 和拉伸测试研究了链结构对具有规则间隔的三、四和六官能连接点的系列多接枝共聚物的形态和拉伸性能的影响。该材料是通过阴离子聚合制备的双官能聚异戊二烯（PI）间隔基和活性聚苯乙烯（PS）支链与不同官能度的氯硅烷偶联而合成的。由于偶联过程是逐步聚合，产生多分散产物，因此利用分馏将每种材料分成三个部分（高、中和低分子量），每个部分具有低多分散性。所有三个级分在每个连接点基础上都具有相同的链结构，但每个分子的连接点单元数量不同。通过应用构成嵌段共聚物的概念，将这些分子的物理行为与当前理论进行了比较。 ...
The effect of chain architecture on the morphological and tensile properties of series of multigraft copolymers, with regularly spaced tri-, tetra-, and hexafunctional junction points, was investigated using transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS), and tensile testing. The materials were synthesized by coupling difunctional polyisoprene (PI) spacers and living polystyrene (PS) branches, made by anionic polymerization, with chlorosilanes of different functionalities. Since the coupling process is a step-growth polymerization, yielding polydisperse products, fractionation was utilized to separate each material into three fractions (high, middle, and low molecular weight), each of low polydispersity. All three fractions have the same chain architecture on a per junction point basis but differ in the number of junction point units per molecule. By applying the constituting block copolymer concept, the physical behavior of these molecules was compared with current theories. ...