Homo‐ and Copolymerization of Norbornene and Styrene with Pd‐ and Ni‐Based Novel Bridged Dinuclear Diimine Complexes and MAO

Macromolecular Chemistry and Physics - Tập 204 Số 5-6 - Trang 868-876 - 2003
Xia Mi1, Zhi Ma1, Leyong Wang1, Yucai Ke1, Youliang Hu1
1State Key Lab of Engineering Plastics, Center for Molecular Science, Beijing Laboratory of Catalysis, CNPC Key Laboratory of Catalysis, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China

Tóm tắt

AbstractNovel bridged dinuclear diimine nickel and palladium complexes catalyzed the vinyl addition polymerization of norbornene at a single active site with high activity. The latter exhibited higher activity than the former. Smaller substituents around the imido group in the ligand were more favorable for increasing the activity than bulkier ones. The polynorbornenes were all noncrystalline but had short‐range order and their glass transition temperature, Tg, ranged from 270 to 400 °C. Furthermore, the random copolymerization of norbornene and styrene was catalyzed by the bridged dinuclear diimine nickel complex with MAO (methylaluminoxane). Gel permeation chromatography (GPC), FTIR and 1H NMR spectroscopies, wide‐angle X‐ray diffraction (WAXD), and differential scanning calorimetry (DSC) indicated that the copolymers are “true” copolymers. The reactivity ratios were rstyrene = 0.281, rnorbornene = 18.7. The packing density, thermostability and the glass transition temperatures of copolymers are increased relative to polystyrene. The solubility and processability of the copolymers are improved relative to polynorbornene.The structures of bridged dinuclear diimine nickel and palladium complexes.magnified imageThe structures of bridged dinuclear diimine nickel and palladium complexes.

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Macromolecular Chemistry and Physics

Tập 204 Số 5-6

868-876

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