【摘要】 本文用250兆赫~1H-核磁共振技术研究了苯乙烯(S)-4-甲基丙烯酰氧-2、2.6.6-四甲基哌啶(M)自由基引发聚合的共聚物的组分比和微结构,定量测定了以M为中心的三元组分布。由此确认该共聚体系属于一级马尔可夫链模型,并确定了单体竞聚率常数,r_M=0.32,r_S=0.60。对苯乙烯含量较多的共聚物还定量估计了以S为中心的三元组分布,与理论上计算结果有很好的一致性。更多还原

【Abstract】 The compositions and the microstructures of styrene (S)-4-Methacryloyloxy-2.2.6.6-tetramethylpiperine (M) copolymers initiated with free radical have been studied by 250 MHz1H-NMR spectra and M-centred triad distributions were quantitatively measured. It is confirmed from the above results that this copolymerization system belongs to the first order Markov chain model. The corresponding reactivity ratios established are rM=0.32, rs=0.60, respectively. The S-centred triad distrbutions for the copolymers rich in styrene were also quantitatively estimated. The observed S-centred triad fractions agree very well with those calculated theoretically.更多还原