文献类型：期刊文献

英文题名：Enhanced mechanical properties of acrylate and 5-vinyl-2-norbornene-based ethylene terpolymers: rational design and synthesis using remotely modulated phosphine-sulfonate palladium complexes

作者：Li, Yong-Qing[1,2];Cao, Gui-Ping[1];Cao, Yu-Cai[2]

机构：[1]East China Univ Sci & Technol, UNILAB State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Shanghai Res Inst Chem Ind Co Ltd, State Key Lab Polyolefins & Catalysis, Shanghai Key Lab Catalysis Technol Polyolefins, Shanghai 200062, Peoples R China

年份：2024

卷号：15

期号：45

起止页码：4662

外文期刊名：POLYMER CHEMISTRY

收录：;EI(收录号：20244717381819);WOS:【SCI-EXPANDED(收录号:WOS:001347621300001)】；

基金：This work was sponsored by Shanghai Rising-Star Program (22QB1402800). We thank Yu-Qing Peng for assistance with NMR characterization, Chuan-Lei Zhang for assistance with X-ray crystallography, De-Rong Meng for assistance with GPC analysis, Chun-Lin Ye for assistance with DSC analysis, and Zhen Liu for assistance with calculations.

语种：英文

外文关键词：Bending moments - Compressive strength - Crosslinking - Elastomers - Homopolymerization - Hydroelasticity - Impact strength - Polyacrylates - Silicones - Tensile strength - Terpolymerization

摘要：From a practical perspective, it is important to maintain or increase the mechanical properties of functional ethylene copolymers to those of nonpolar polyethylene (PE). In this contribution, we report the enhanced mechanical properties of acrylate- and 5-vinyl-2-norbornene (VNB)-based ethylene terpolymers. Originally, phosphine-sulfonate Pd1 and Pd2 with methyl and phenyl installed para to the sulfonic group were synthesized and characterized. Subsequently, long-chain (but more challenging) polar monomers in which the polar groups combined linearly with double bonds (butyl acrylate (BA) and ethylene glycol monomethyl ether acrylate (EGMA)) were chosen to obtain more flexible chain structures. Crosslinkable and cyclic VNB were used, targeting at rapid crosslinking and enhanced material properties. Ethylene copolymerization and terpolymerization could be efficiently achieved using this strategy, and polymers exhibited improved surface and similar or enhanced mechanical properties compared with those of PE. High activity (2.9 x 107 g (mol h)-1) and high molecular weight (3.8 x 105) were simultaneously observed in ethylene homopolymerization. E-BA(0.64) and E-EGMA(0.87) had a strain-at-break as high as 1016% and 974%, respectively, and stress-at-break up to 45 MPa compared with those of ethylene homopolymer. VNB-based terpolymers E-BA(0.68)-VNB(0.94) and E-EGMA(0.73)-VNB(1) displayed better tensile elongations (723% and 714%) than those of ENB- and DCPD-based terpolymers. Furthermore, though similar thermoplastic properties to PE (strain recovery (SR) = 10%) were observed, enhanced mechanical properties of teropolymers were obtained after sulfur vulcanization, with SR = 19-23% and Delta sigma (stress differences) = 3.3-10.3 MPa.