2-乙烯基吡啶与甲基丙烯酸甲酯共聚物的高分辨^1HNMR研究

本文根据自由基引发聚合的2-乙烯基吡啶-甲基丙烯酸甲酯共聚物的~1H NMR谱,定量地研究了共聚物中的微结构单元及其组成.对分别以2-乙烯基吡啶和甲基丙烯酸甲酯为中心的三元组分分布,都做了定量测定.确定了该共聚体系属于一级Markov链模型和单体竞聚率γ_v=O.64,γ_m=O.31.与理论上的计算结果吻合良好.

High resolution ^1H NMR study of 2-vinyl-pyridine -- methyl methacrylate copolymers

The composition and the microstructures of the copolymer of 2-vinylpyridine (V) -- methyl methacrylate(M) initiated with free radical have been quantitatively studied by 250 MHZ ^1H NMR spectra. V-centred triad 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 γv=0.64, γM=0.31, respectively, agreeing very well with those calculated theoretically.