Seo, Jin Young Kang, Seung Hyun Lee, Mi Ryu Choi, Chul-Hwan Lee, Sang-Ho Cho, Sangho Lee, Jung-Hyun Baek, Kyung-Youl 2024-01-19T12:32:00Z 2024-01-19T12:32:00Z 2022-04-05 2022-03 1598-5032 https://pubs.kist.re.kr/handle/201004/115559 Cyclic olefin polymers (COPs) have gained attention as key components of future engineering plastics. Herein, we synthesized thermally stable COPs with high flexibility and optical transparency utilizing an industrially available WCl6/iBu(3)Al/EtOH catalyst system. The strategically designed cyclic monomers with flexible butyl group (nbutylnorbornene (nBuNB) and nbutyl-tetracyclododec-4-ene (nBuDMON) (flexible modifier)) and commercially available tetracyclic monomer (DMON) were copolymerized via ring opening metathesis polymerization (ROMP). Thereafter, the double bonds of the resulting polymer backbone were saturated by hydrogenation. The obtained series of COPs by changing the molar ratio of DMON and the flexible modifier showed not only various glass transition temperatures (Tg) ranged from 80 to 155 C but also constantly high degradation temperatures (T-d,T-5%) around 300 C. The representative hydrogenated P(DMON0.7-co-nBuDMON(0.3)) exhibited 155 C of T-g and 402 C of T-d,T-5% as well as excellent optical transmittance (> 91%) in the visible range. Considering these superior thermal stability, optical transparency, and high productivity (190 g L-1), COPs with the flexible modifier were anticipated to be key component materials for future optical applications. English 한국고분자학회 Synthesis of Thermo-Controlled Cyclic Olefin Polymers via Ring Opening Metathesis Polymerization: Effect of Copolymerization with Flexible Modifier Article 10.1007/s13233-022-0025-9 1 Macromolecular Research, v.30, no.3, pp.205 - 211 Macromolecular Research 30 3 205 211 N scie scopus kci ART002821747 000764758000001 2-s2.0-85125656254 Polymer Science Polymer Science Article; Early Access GLASS-TRANSITION TEMPERATURE DICYCLOPENTADIENE HYDROGENATION COMPLEXES ROMP cyclic olefin polymer ring-opening metathesis polymerization hydrogenation glass transition temperature optical transparency