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《高分子科学(英文版)》 2018-02
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Synthesis of High Performance Cyclic Olefin Polymers Using Highly Efficient WCl_6-based Catalyst System

Yi-Ran Zhang;Ji-Xing Yang;Li Pan;Yue-Sheng Li;Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University;Collaborative Innovation Center of Chemical Science and Engineering (Tianjin);  
Cyclic olefin polymers(COPs) with high glass transition temperature, high transparency(higher than 80%) in the visible light range, excellent thermal stability and outstanding mechanical properties have been synthesized by effective ring opening metathesis polymerization(ROMP) of exo-1,4,4 a,9,9 a,10-hexahydro-9,10(1′,2′)-benzeno-l,4-methanoanthracene(HBM) and dicyclopentadiene(DCPD) or norbornene(NBE) using WCl_6/i-Bu_3Al/ethanol/1-hexene catalyst system, followed by hydrogenation of double bonds. 1-Hexene acted as a molecular weight controller in the polymerization reaction, tuning the number-average molecular weight(M_n) of P-HBM from 5.8 × 10~4 to 41.1 × 10~4. The monomer composition and thermal properties of the copolymers were characterized by nuclear magnetic resonance(NMR), differential scanning calorimetry(DSC) and thermogravimetric analysis(TGA). The saturated polymers exhibited high decomposition temperatures(T_d) around 340 °C and glass transition temperatures(T_g) in the range from 117.5 °C to 219.7 °C. What is more, tensile tests indicated that the mechanical properties of the COPs could be effectively tuned in a wide range by introducing varying amount of small cyclic olefin such as DCPD or NBE.
【Fund】: financial support by the National Natural Science Foundation of China (Nos. 21234006 and U1510124)
【CateGory Index】: O632.12;O643.36
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