Polynorbornenes prepared by vinyl addition pathway are known to have some desirable characteristics for wider application but they have some critical drawbacks such as brittleness, poor solubility and adhesion. In order to improve these drawbacks, extensive research for the successful homo- and copolymerization of polar functionalized norbornene with olefin has been carried out. Even though considerable advance has been achieved in the polymerization of polar functionalized monomers, successful catalytic systems for the homopolymerization of polar functionalized norbornene are rare. In this study, a novel successful catalytic system for the polymerization of polar functionalized norborene is proposed. This system employs Pd $\beta}$-diketiminate/borate cocatalyst in water/organic mixed solvents and it is unique due to introduction of water as a component of solvents. Polymers obtained in this study show high Mw with narrow PDI. Effects of several reaction parameters to the polymer activity and properties are investigated and optimal catalytic system are proposed.
通过 vinyl 加成途径制备的聚诺尔博烯已知具有一些适合更广泛应用的优良特性,但也存在一些关键缺点,如脆性差、溶解性差和粘附性差。为了改善这些缺点,已针对极性官能化诺尔博烯与烯烃的成功均聚和共聚反应进行了广泛研究。尽管在极性官能化单体的聚合方面已取得相当大的进展,成功的催化体系用于极性官能化诺尔博烯的均聚反应仍然很少。在本研究中,提出了一种新颖且成功的催化体系,用于极性官能化诺尔博烯的聚合。该体系在
水/有机混合溶剂中采用 Pd
$\beta}$-
二酮胺/
硼酸盐助催化剂,其独特之处在于将
水作为溶剂的成分引入。本研究中获得的聚合物显示出高分子量和窄的分子量分布指数(PDI)。研究了多个反应参数对聚合活性和性质的影响,并提出了优化的催化体系。