期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
Phosphine/Benzocyclone-based Neutral Nickel Catalysts for Ethylene Polymerization and Copolymerization with Polar Monomers 被引量:2
1
作者 Fei Wang Li Pan +2 位作者 Vladislav A.Tuskaev Svetlana Ch.Gagieva Yue-Sheng Li 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2024年第2期202-212,I0007,共12页
The efficient copolymerization of olefin with polar monomers using nickel-based catalysts presents a longstanding challenge. In this contribution, three phosphine-benzocyclone ligands and corresponding neutral nickel ... The efficient copolymerization of olefin with polar monomers using nickel-based catalysts presents a longstanding challenge. In this contribution, three phosphine-benzocyclone ligands and corresponding neutral nickel catalysts(Ni1: Ar = Ph;Ni2: Ar = 2-(C_(6)H_(5))C_(6)H_(4);Ni3: Ar = 2-[2',6'-(Me O)_(2)-C_(6)H3]C_(6)H_(4)) were prepared and applied for the ethylene polymerization and copolymerization with polar monomers without any cocatalyst. The bulky substituent groups in complexes Ni2 and Ni3 contributed to high catalytic activities(up to 7.24×10^(6) and 9.04×10^(6)g·mol Ni^(-1)·h^(-1), respectively), and produced high-molecular-weight polyethylene(Mw up to 545.7 k Da). Complex Ni3 exhibited high activities for ethylene polymerization at the level of 10^(6) g·mol Ni^(-1)·h^(-1) across a wide range from 30 ℃ to 120 ℃, exhibiting excellent high temperature tolerance. These nickel complexes were also effectively employed in the copolymerization of ethylene with methyl acrylate, ethyl acrylate, butyl acrylate and lauryl acrylate, producing copolymers with high molecular weights(Mw up to 80.5 k Da) and high polar monomer incorporation(up to 8.2 mol%). Microstructure analyses revealed that the introduction of large sterically hindered substituents facilitated the incorporation of polar functional units into the polymer backbone. This study demonstrates the potential of these nickel-based catalysts for efficient copolymerization of olefin with polar monomers. 展开更多
关键词 Neutral nickel catalyst Ethylene polymerization COPOLYMERIZATION Polar acrylate monomers
原文传递
Effects of Hydrophilic Monomer Types and Level on Polystyrene-Acrylate/montmorillonite Nanocomposite Made by Emulsion Polymerization 被引量:3
2
作者 F.A.Zhang L.Chen +1 位作者 J.Q.Ma X.Yang 《复旦学报(自然科学版)》 CAS CSCD 北大核心 2007年第5期754-,共1页
1 Results Nanocomposite has attracted more and more interest all over the world.Polystyrene (PS) is a commercialized and mass-productive polymer,continuous research efforts have been devoted to the development of poly... 1 Results Nanocomposite has attracted more and more interest all over the world.Polystyrene (PS) is a commercialized and mass-productive polymer,continuous research efforts have been devoted to the development of polystyrene/montmorillonite (PS/MMT) nanocomposites[1-2].But the polarity of styrene (St) is too small to intercalate the space between the clay layers.The polarity of hydrophilic monomer is so strong that it can intercalate the MMT easily,the intercalated smectic clays maybe exfoliated by usin... 展开更多
关键词 nanocomposites STYRENE hydrophilic acrylate monomer clay thermal properties
原文传递
High-efficiency room temperature phosphorescence from amorphous metal-free copolymers
3
作者 Dongpeng Yan 《Science China Chemistry》 SCIE EI CAS CSCD 2017年第2期163-164,共2页
Photofunctional materials with room-temperature phosphorescence(RTP)commonly appeared in expensive metal-coordination complexes and rare-earth-based compounds.Recently,the metal-free organic RTP materials have been ... Photofunctional materials with room-temperature phosphorescence(RTP)commonly appeared in expensive metal-coordination complexes and rare-earth-based compounds.Recently,the metal-free organic RTP materials have been paid growing attention from scientific community because of the ease of molecular design,low cost as well as potential applications in molecular switches,chemical sensors and biological imaging.To date,efficient RTP materials with high quantum yield are still very limited due to the T_1-S_0 spinforbidden process and weak spin-orbital coupling.Current mechanism based on crystallization-induced or aggregationinduced phosphorescence may serve as an effective way to enhance the RTP[1,2]; 展开更多
关键词 Acrylic monomers Crystalline materials Light emission Organic polymers PHOSPHORESCENCE
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部