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    • 4. 发明授权
    • Multi-arm cationic star-polymers
    • 多臂阳离子星形聚合物
    • US5395885A
    • 1995-03-07
    • US169434
    • 1993-12-17
    • Joseph P. KennedyTimea M. MarsalkoIstvan J. Majoros
    • Joseph P. KennedyTimea M. MarsalkoIstvan J. Majoros
    • C08F293/00C08F297/00C08G81/00
    • C08F297/00
    • The first synthesis of a multi-arm radial-star polyisobutylene is described. The synthesis occurred by the addition of excess divinylbenzene (DVB) linking reagent to a living polyisobutylene (PIB.sup..sym.), charge, i.e., by the "arm first" method under specific conditions. The radial structure of the star-PIB was proven by determining the molecular weight of a sample by light scattering, then selectively destroying the aromatic polydivinylbenzene core, and finally determining the molecular weight of the surviving aliphatic PIB arms. The synthesis strategy, kinetic observations during synthesis, and procedures leading to a representative star-PIB are described. This product whose M.sub.w =1,134,400 g/mole with M.sub.w /M.sub.n =2.83, contained .about.90.3 mole % (.about.78 wt. %) PIB arms and .about.9.7 mole % (.about.22 wt. %) aromatic core; thus the number of PIB arms emanating from the core was N.sub.n, arm =56 or N.sub.w, arm (weight average number of arms)=110.
    • 描述了多臂径向星形聚异丁烯的第一次合成。 通过在特定条件下通过加入过量的二乙烯基苯(DVB)连接试剂与活性聚异丁烯(PIB(+))进行合成,即通过“臂第一”方法进行加料。 通过用光散射确定样品的分子量,然后选择性地破坏芳族聚二乙烯基苯核心,最后确定存活的脂族PIB臂的分子量,证明了星形PIB的径向结构。 描述了合成策略,合成过程中的动力学观察以及导致代表性的星形-PIB的程序。 该产品的&upbar&Mw = 1,134,400克/摩尔<上升&Mw /&upbar&Mn = 2.83,含有差异90.3摩尔%(差异78重量%)PIB臂和差异9.7摩尔%(差异22重量%)芳香核; 因此从核心发出的PIB武器的数量是&upbar&Nn,arm = 56或&upbar&Nw,手臂(重量平均臂数)= 110。