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前已报道,以高活性铁催化剂可以制得性能良好的含顺-1,4-1,2结构的等二元聚丁二烯。文献已有用~(13)C-NMR研究以钴,钼催化剂合成的这种等二元聚合物的报导。本工作用~(13)C-NMR进行了研究,得到的聚合物的~(13)C-NMR图谱表明,聚合物的脂碳部分共有十一个共振峰,烯碳部分有九个峰。通过改进Furukawa的经验参数,并应用Randall的方法,这些共振峰的归属得到了令人满意的结果。确认该聚合物是双烯和单烯的无规共聚物,但偏离Bernoulli分布,趋向于一级Markov分布。
It has been previously reported that isobutene polybutadiene containing cis-1,4-1,2 structure with good activity can be prepared with highly active iron catalyst. The literature has reported the use of ~ (13) C-NMR for such iso binary polymers synthesized with cobalt and molybdenum catalysts. The work was studied by ~ (13) C-NMR. The ~ (13) C-NMR spectrum of the obtained polymer showed that there were eleven resonance peaks in the aliphatic carbon part and nine peaks in the olefinic carbon part. By improving Furukawa’s empirical parameters and applying Randall’s method, the assignment of these formants gives satisfactory results. It was confirmed that the polymer was a random copolymer of diene and mono-olefin but deviated from the Bernoulli distribution and tended to a first order Markov distribution.