Preparation and characterization of cycloolefin polymer based on dicyclopentadiene (DCPD) and dimethanooctahydronaphthalene (DMON)

摘要

Ring-opening metathesis polymerization (ROMP) and subsequent hydrogenation of the mixture of dicyclopentadiene (DCPD) and 1,4,5,8-dimethano-1,2,3,4,4a,5,8, 8a-octahydronaphthalene (DMON) were conducted. ROMP was successfully performed at room temperature using WCl_6/iBu_3Al/2-BuOH (1/0.7/1.2) catalyst system when the DCPD/DMON molar ratio was 1. Depending on the DCPD/DMON molar ratio, the catalyst component ratio for the polymerization changed. The double bond in the prepared ROMP polymer could be completely hydrogenated using Ni(acac)_2/iBu_3Al at molar ratio of the Ni/double bond in polymer = 0.2 mol% and Al/Ni = 4 when the reaction was conducted at 80 C for 3 h. After hydrogenation, the glass transition temperature (T_g) of all ROMP polymers was decreased by 40 C. Depending on the DCPD and DMON molar ratio, the T_g of the ROMP polymer and hydrogenated ROMP polymer changed. The hydrogenated DCPD-DMON ROMP copolymer was characterized by using 2D ~1H-~1H COSY and 2D ~1H-~(13)C HSQC NMR spectroscopy. Thermal stability and light transmittance for the ROMP polymer and the hydrogenated ROMP polymer were compared by using TGA and UV.