Synthesis and Characterization of Optically Active Hyperbranched Poly(carbosiloxane)s
作者:Motoi Oishi、Maki Minakawa、Ichiro Imae、Yusuke Kawakami
DOI:10.1021/ma0120815
日期:2002.6.1
gave optically active hyperbranched poly(carbosiloxane)s in good yield (Mn = 4320−9370, [a]D25 = +13.1 to +4.5, Tg = −29−34 °C). Determinations of the composition and degree of branching (0.27−0.43) of the polymers were made by taking advantage of the simplicity of the 29Si NMR spectra of the optically active polymers compared with meso/dl polymers. End functionalization of the terminal vinyl groups
通过(S)的缩合反应合成了光学纯的(S,S)-1,5-二(1-萘基)-1,5-二苯基-1,5-二乙烯基-3-甲基三硅氧烷(> 99%ee ) -(1-萘基)苯基乙烯基硅烷醇锂(> 99%ee)与甲基二氯硅烷。各种进料比的(S,S)-1,5-二(1-萘基)-1,5-二苯基-1,5-二乙烯基-3-甲基三硅氧烷的氢化硅烷化聚合反应(AB 2单体,A = Si-H和B = Vi)和1,1,3,3-四甲基-1-乙烯基二硅氧烷(A'B'单体)以良好的收率得到旋光性超支化聚(碳硅氧烷)(M n = 4320-9370,[a] D 25 = +13.1至+ 4.5,T g= −29−34°C)。聚合物的组成和支化度(0.27-0.43)的确定是通过利用旋光活性聚合物与meso / dl聚合物相比29 Si NMR光谱的简单性来进行的。通过使用氢化硅烷化反应或氢硼化反应证明了末端乙烯基(Vi)的末端官能化,