Lye Diane S, Cohen Aaron E, Wong Madeleine Z, Weck Marcus
Molecular Design Institute and Department of Chemistry, New York University, 100 Washington Square East, NY, 10003, USA.
Macromol Rapid Commun. 2017 Jul;38(14). doi: 10.1002/marc.201700174. Epub 2017 May 22.
A direct and facile route toward semitelechelic polymers, end-functionalized with palladated sulfur-carbon-sulfur pincer (Pd -pincer) complexes is reported that avoids any post-polymerization step. Key to our methodology is the combination of reversible addition-fragmentation chain-transfer (RAFT) polymerization with functionalized chain-transfer agents. This strategy yields Pd end-group-functionalized materials with monomodal molar mass dispersities (Đ) of 1.18-1.44. The RAFT polymerization is investigated using a Pd -pincer chain-transfer agent for three classes of monomers: styrene, tert-butyl acrylate, and N-isopropylacrylamide. The ensuing Pd -pincer end-functionalized polymers are analyzed using H NMR spectroscopy, gel-permeation chromatography, and elemental analysis. The RAFT polymerization methodology provides a direct pathway for the fabrication of Pd -pincer functionalized polymers with complete end-group functionalization.
报道了一种直接且简便的合成半遥爪聚合物的方法，该聚合物末端用钯化硫-碳-硫钳形（Pd-钳形）配合物官能化，避免了任何后聚合步骤。我们方法的关键是将可逆加成-断裂链转移（RAFT）聚合与官能化链转移剂相结合。该策略可得到单峰摩尔质量分散度（Đ）为1.18 - 1.44的末端带有钯官能团的材料。使用一种Pd-钳形链转移剂对三类单体（苯乙烯、丙烯酸叔丁酯和N-异丙基丙烯酰胺）进行了RAFT聚合研究。随后，使用核磁共振氢谱、凝胶渗透色谱和元素分析对所得的末端带有Pd-钳形官能团的聚合物进行了分析。RAFT聚合方法为制备具有完全末端官能化的Pd-钳形官能化聚合物提供了一条直接途径。
