Preparation and characterization of cycloolefin polymer based on dicyclopentadiene (DCPD) and dimethanooctahydronaphthalene (DMON)
2013
Widyaya, Vania Tanda | Vo, Huyen Thanh | Dhimas Dhewangga Putra, Robertus | Hwang, Woon Sung | Ahn, Byoung Sung | Lee, Hyunjoo
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 WCl₆/iBu₃Al/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/iBu₃Al at molar ratio of the Ni/double bond in polymer=0.2mol% and Al/Ni=4 when the reaction was conducted at 80°C for 3h. After hydrogenation, the glass transition temperature (Tg) of all ROMP polymers was decreased by 40°C. Depending on the DCPD and DMON molar ratio, the Tg 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–¹³C HSQC NMR spectroscopy. Thermal stability and light transmittance for the ROMP polymer and the hydrogenated ROMP polymer were compared by using TGA and UV.
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