Arborescent graft polybutadienes
Arborescent graft polybutadienes
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DOI：
10.1021/ma970280b
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发表时间：
1997-09
期刊：
影响因子：
5.5
通讯作者：
M. Hempenius;Walter Michelberger;M. Möller
中科院分区：
文献类型：
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作者：
M. Hempenius;Walter Michelberger;M. Möller
通过聚丁二烯乙烯基与氯二甲基硅烷的氢化硅烷化，然后与活性聚丁二烯链接枝，制备了级联支化的“接枝上接枝”聚丁二烯，称为树状接枝聚合物。重复的氢化硅烷化-阴离子接枝循环导致树状向外生长，产生定义明确的球形大分子。材料的分子量随着每个接枝循环而急剧增加，因为聚合物链而不是小分子被用作结构单元。通过凝胶渗透色谱法，静态光散射测量，和粘度测定的材料进行了表征。
Cascade-branched, “graft on graft” polybutadienes, denoted arborescent graft polymers, were prepared by hydrosilylation of polybutadiene vinyl groups with chlorodimethylsilane, followed by grafting with living polybutadiene chains. Repeated hydrosilylation−anionic grafting cycles led to a treelike outward growth, yielding well-defined, spherically shaped macromolecules. The molecular weight of the materials increased dramatically with each grafting cycle, since polymer chains rather than small molecules were used as building blocks. The materials were characterized by means of gel permeation chromatography, static light scattering measurements, and viscosimetry.