当前位置：
X-MOL 学术
›
Macromolecules
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Fast and Regioselective Polymerization of para-Alkoxystyrene by Palladium Catalysts for Precision Production of High-Molecular-Weight Polystyrene Derivatives
Macromolecules ( IF 5.1 ) Pub Date : 2019-12-24 , DOI: 10.1021/acs.macromol.9b02274 Guangfu Liao 1 , Zefan Xiao 1 , Xiaolin Chen 1 , Cheng Du 1 , Liu Zhong 1 , Chi Shing Cheung 1 , Haiyang Gao 1
Macromolecules ( IF 5.1 ) Pub Date : 2019-12-24 , DOI: 10.1021/acs.macromol.9b02274 Guangfu Liao 1 , Zefan Xiao 1 , Xiaolin Chen 1 , Cheng Du 1 , Liu Zhong 1 , Chi Shing Cheung 1 , Haiyang Gao 1
Affiliation
|
Polymerization of polar vinyl monomers by a coordination–insertion approach is a topic of fundamental importance to the field of polymer synthesis. Herein, we initially report the coordination–insertion polymerization of para-alkoxystyrene (pAOS) monomers by the dibenzobarrelene-based α-diimine palladium catalysts. The unprecedented polymerization characteristics including rapid initiation, fast chain growth, controlled chain transfer, and high-molecular-weight polymer with a narrow distribution (Mw > 1000 kg/mol, PDI < 1.32) reflected previously unrecognized aspects of palladium-catalyzed pAOS polymerization. Chain-end analysis and characterization of palladium intermediates showed that the pAOS monomer was rapidly inserted into the primary palladium species in a full 1,2-regioselectivity, and the chain transfer took place by monomer-assisted β-H abstraction at high monomer concentrations. The resultant polymers showed improved mechanical properties and thermal stabilities and were also attractive candidates of hydrophilic styrenic resin.
中文翻译：
钯催化剂快速和区域选择性聚合对位烷氧基苯乙烯，可精确生产高分子量聚苯乙烯衍生物
通过配位-插入方法聚合极性乙烯基单体是聚合物合成领域最重要的主题。在本文中，我们首先报道了基于二苯并barrelene的α-二亚胺钯催化剂对对烷氧基苯乙烯（p AOS）单体的配位-插入聚合反应。前所未有的聚合特性包括快速引发，快速链增长，受控链转移以及分布窄（M w > 1000 kg / mol，PDI <1.32）的高分子量聚合物，反映了钯催化的p AOS以前无法识别的方面聚合。钯中间体的链端分析和表征表明，pAOS单体以完全的1，2-区域选择性快速插入到主要的钯物种中，并且链转移是通过在高单体浓度下通过单体辅助的β-H提取进行的。所得聚合物显示出改善的机械性能和热稳定性，并且还是亲水性苯乙烯树脂的有吸引力的候选物。
更新日期：2019-12-25
中文翻译：
钯催化剂快速和区域选择性聚合对位烷氧基苯乙烯，可精确生产高分子量聚苯乙烯衍生物
通过配位-插入方法聚合极性乙烯基单体是聚合物合成领域最重要的主题。在本文中，我们首先报道了基于二苯并barrelene的α-二亚胺钯催化剂对对烷氧基苯乙烯（p AOS）单体的配位-插入聚合反应。前所未有的聚合特性包括快速引发，快速链增长，受控链转移以及分布窄（M w > 1000 kg / mol，PDI <1.32）的高分子量聚合物，反映了钯催化的p AOS以前无法识别的方面聚合。钯中间体的链端分析和表征表明，pAOS单体以完全的1，2-区域选择性快速插入到主要的钯物种中，并且链转移是通过在高单体浓度下通过单体辅助的β-H提取进行的。所得聚合物显示出改善的机械性能和热稳定性，并且还是亲水性苯乙烯树脂的有吸引力的候选物。
京公网安备 11010802027423号