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CHINESE JOURNAL OF POLYMER SCIENCE · 2015 ·Vol. 34 ·期 1 ·104-110 · IF 1.835

High trans-1,4 (co)polymerization of β-myrcene and isoprene with an iminophosphonamide lanthanum catalyst

Liu Bo,Liu Dong-tao,Li Shi-hui,Sun Guang-ping,Cui Dong-mei

β -Iminophosphonamide ligated lanthanum bis(benzyl) complex (NPN Dipp )La(CH 2 Ph-4-Me) 2 (THF) (NPN Dipp = Ph 2 P(NC 6 H 3 i Pr 2 -2,6) 2 ), upon activation of AlEt 3 and [Ph 3 C][B(C 6 F 5 ) 4 ], exhibited high catalytic activity and high trans -1,4 stereoselectivity for the polymerization of bio-sourced β -myrcene (MY). Based on which, a series of novel trans -1,4 regulated elastomers could be generated by random/block copolymerization of MY and isoprene (IP).

CAS / MDL: 557-20-0 24544-04-5 109-72-8

研究领域: 高分子化学 · 生物材料 · 催化化学

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POLYMER SCIENCE SERIES B · 2021 ·Vol. 63 ·期 3 ·239-244 · IF 1.049

Synthesis of Aromatic Polyamide Copolymers with Reduced Dielectric Constant

Huanhuan Zhu,Niu Mingkang,Feng Zhongtai,Li Chengjie,Li Yonghao,Jiao Qingze,Wang Shanshan,Feng Caihong,Zhao Yun,Lv Yuzhen

Abstract To obtain aromatic polyamides with reduced dielectric constant, a series of aromatic polyamide copolymers derived from the reaction between m -phenylenediamine to trans -1,2-cyclohexanediamine and isophthaloyl chloride were synthesized using the low-temperature solution polymerization in the presence of 2-methylpyridine. The influence of the content of trans -1,2-cyclohexanediamine on the structure and properties of aromatic copolyamides was evaluated. With increasing the content of trans -1,2-cyclohexanediamine, the inherent viscosities of copolymers decrease from 1.95 to 1.14 dL/g. The copolymer with 25 mol % of trans -1,2-cyclohexanediamine has a reduced dielectric constant ε r of 4.61 at 1 MHz, which is 26% lower than homopolyamide. Meanwhile, as-synthesized aromatic polyamides and copolyamides show good thermal stability and mechanical properties.

研究领域: 材料科学 · 高分子化学

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ORGANOMETALLICS · 2022 · IF 3.837

Rare-Earth Metal Complexes Bearing Pyridyl-Functionalized Amidinate Ligands for Highly trans-1,4-Selective Living (Co)Polymerization of 1,3-Conjugated Dienes

Jixing Wang,Suting Xu,Xiang Hu,Yanchen Huo,Xiaochao Shi

Rare-earth metal complexes bearing pyridyl-functionalized amidinate ligands were synthesized, and upon activation by a borate, all of these complexes exhibited high catalytic activities for the living polymerization of isoprene and myrcene to generate trans-1,4 polymers (≤96.8% for polyisoprene and ≤94.8% for polymyrcene). A metal dependence effect was observed, and the scandium complexes with a smaller central ion afforded polymers with the highest trans-1,4-regularity. Moreover, the 3-Sc/[PhMe2NH][B(C6F5)4] binary system also promoted block copolymerization of isoprene and ε-caprolactone, affording the copolymers that consisted of a nonpolar polyisoprene block possessing trans-1,4-microstructure and a polar poly(ε-caprolactone) block.

CAS / MDL: 78-79-5

研究领域: 化学 · 高分子科学

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High trans-1,4 (co)polymerization of β-myrcene and isoprene with an iminophosphonamide lanthanum catalyst

Synthesis of Aromatic Polyamide Copolymers with Reduced Dielectric Constant

Rare-Earth Metal Complexes Bearing Pyridyl-Functionalized Amidinate Ligands for Highly trans-1,4-Selective Living (Co)Polymerization of 1,3-Conjugated Dienes