Ultra‐High‐Molecular‐Weight Polymers Produced by the Immortal Phosphine‐Based Catalyst System
作者:Yun Bai、Jianghua He、Yuetao Zhang
DOI:10.1002/anie.201811946
日期:2018.12.21
promote the frustrated Lewis pair (FLP)‐catalyzed living polymerization of methyl methacrylate (MMA), achieving ultrahigh molecular weight (UHMW) poly(methyl methacrylate) (PMMA) with Mn up to 1927 kg mol−1 and narrow molecular weight distribution (MWD) at room temperature (RT). This FLP catalyst system exhibits exceptionally long lifetime polymerization performance even in the absence of free MMA, which
强大的有机磷超碱N-(二苯基膦基)-1,3-二异丙基-4,5-二甲基-1,3-二氢-2H-咪唑-2-亚胺(IAP3)与位阻但适度为酸性的路易斯酸结合使用(LA),(4-Me- 2,6 - t Bu 2 -C 6 H 2 O)Al i Bu 2((BHT)Al i Bu 2),以协同促进沮丧的Lewis对(FLP)催化的生活聚合甲基丙烯酸甲酯(MMA),实现M n高达1927 kg mol -1的超高分子量(UHMW)聚甲基丙烯酸甲酯(PMMA)和在室温(RT)下较窄的分子量分布(MWD)。该FLP催化剂体系即使在不存在游离MMA的情况下,也表现出异常长的聚合寿命,这可以在将所得体系在室温下放置24小时后重新引发所需的活性聚合。