中文摘要：

以2-溴丙酸甲酯为引发剂，溴化亚铜为催化剂．五甲基二己基三胺为配体，进行丙烯酸正丁酯和甲基丙烯酸甲酯的原子转移自由基聚合。用单体竞聚率的差别合成梯度共聚物（rM=2.58，rB=0.25）。通过分析共聚物^13C-NMR谱图的羰基峰，得到以MMA为中心和以BA为中心的三元组的相对浓度，转化得二元组浓度，用各元组浓度随转化率的变化表征梯度共聚物的梯度结构。

英文摘要：

Copolymers of methyl methacrylate （MMA） and butyl acrylate （BA） were prepared using atom transfer radical polymerization （ATRP） initiated by methyl 2-bromopropionate （BMP）, catalyzed by CuBr / N, N, N′, N″, N′″-pentamethyldiethyhnetriamine （PMDETA） in bulk. Reactivity ratios were calculated （rM=2. 58 rB=0. 25）. The triad sequences were determined by using the carbonyl resonance frequencies. The dyad concentrations in the copolymers were obtained from them. The varieties of triad and dyad concentration fraction with conversion were first introduced to characterize the gradient structures.