標題: | Copolymerization of norbornene with ethylene: a high-resolution liquid NMR, DSC and solid state NMR study |
作者: | Huang, WJ Chang, FC Chu, PPJ 應用化學系 Department of Applied Chemistry |
關鍵字: | cycle olefin copolymer (COC);monomer reactivity ratio;solid state NMR;spin-lattice relaxation time (T-1p(C)) |
公開日期: | 1-三月-2000 |
摘要: | In this paper, we report the monomer reactivity on the copolymerization of norbornene and ethylene. The reactivity ratios for ethylene (M-1) and norbornene (M-2) are 18.5 and 0.035, respectively. Different copolymerization conditions can produce COC with different microstructures. A C-13 NMR shift assignment in pentad sequences in copolymers has been obtained. More isolated polynorbornene or a micro-block length can be obtained using a low Zr/Al catalyst/co-catalyst ratio and at a lower NB/ethylene feed ratio. The T-1p(C) decay curve shows two component decays in all resonance peaks. These two component decays come from different norbornene microstructures, while the block and alternative have similar T-1p(C) values. |
URI: | http://hdl.handle.net/11536/30662 |
ISSN: | 1022-9760 |
期刊: | JOURNAL OF POLYMER RESEARCH-TAIWAN |
Volume: | 7 |
Issue: | 1 |
起始頁: | 51 |
結束頁: | 56 |
顯示於類別: | 期刊論文 |