聚双环戊二烯的共聚改性及其性能调控

聚双环戊二烯（PDCPD）是一种新型的高性能热固性工程树脂，具有优异的力学性能、较高的热变形温度和稳定的物化性质。开展表面亲水改性研究有助于拓展其应用领域。其本文采用2-甲基-2-丙烯酸-2(2,3,3A,4,7,7A-六氢-4,7-亚甲基-1氢-茚基)氧]乙酯（DCPEMA）与双环戊二烯（DCPD）通过开环易位聚合反应制备了共聚PDCPD。研究结果表明：DCPEMA通过打开环戊烯基团和烯烃双键的方式，与DCPD生成共聚产物。随着DCPEMA的引入，共聚物的拉伸强度从64.3 MPa下降至9.2 MPa。当n(DCPD) : n(DCPEMA) = 2 : 1时，断裂应变达到最大值68.34 %。随着DCPEMA浓度的继续提高，断裂应变出现则下降。通过溶胀率测试估算了共聚PDCPD 的网络交联度，结果显示聚合网络交联度的变化趋势与断裂应变的变化趋势类似。DCPEMA的引入可以显著提高共聚物的表面亲水性。

Regulation of surface property of polydicyclopentadiene via copolymerization

As a new type of thermoset polymer, polydicyclopentadiene (PDCPD) is valued in industry for its excellent mechanical properties, improved heat resistance, and stable physical and -chemical tolerance. Research on the modification of hydrophilic properties is of importance for the expanding application of the material. Hence, copolymer PDCPD was prepared by copolymerization of dicyclopentadiene (DCPD) with 2-Propenoic acid, 2-methyl-, 2- 2,3, 3a, 4, 7,7a-hexahydro-4,7-methano-1H-indenyl] oxy] ethyl ester (DCPEMA) via Ring Open Metathesis Polymerization (ROMP). The research results indicated that DCPEMA copolymerized with DCPD via opening cyclopentene group and olefin double bond. Tensile strength of the copolymer was decreased from 64.3 MPa to 9.2 MPa by introducing DPCEMA. Breaking elongation of the copolymer reached 68.34% when n(DCPD) : n(DCPEMA) = 2 : 1 was applied, however, it dropped with the further increasing of the DPCEMA content. The crosslinking density of the copolymer was evaluated via swelling test. The swelling ratio of copolymer showed similar trends as breaking elongation. Moreover, the surface hydrophilicity of the copolymer could be improved dramatically with the introduction of DPCEMA.