Effect of molecular weight of added polystyrene on the order-disorder transition of styrene-butadiene diblock copolymer
Effect of molecular weight of added polystyrene on the order-disorder transition of styrene-butadiene diblock copolymer
复制标题
添加聚苯乙烯分子量对苯乙烯-丁二烯二嵌段共聚物有序-无序转变的影响
DOI：
10.1021/ma00174a029
复制
发表时间：
1987
期刊：
影响因子：
5.5
通讯作者：
R. Roe
中科院分区：
文献类型：
--
作者：
S. Nojima;R. Roe
摘要：研究了均聚物的加入对嵌段共聚物有序无序转变温度的影响。基于随机相近似的理论表达式分析表明，转变温度的变化方向由加入的均聚物长度与嵌段共聚物长度的关系以及混合物中单体的总体组成决定。用含有苯乙烯-丁二烯二嵌段共聚物和不同分子量聚苯乙烯的混合物进行小角度x射线散射测量。观测到的散射强度曲线形状、峰值强度的角位置和微相分离的旋量温度与理论预测吻合较好。结果确定的相互作用能密度值与先前从云点数据确定的值相当吻合。关键词。嵌段共聚物，有序无序过渡，混相，聚苯乙烯，丁二烯嵌段共聚物，小角度X射线散射。
Abstract : The change in the order disorder transition temperature of block copolymer, induced by the addition of homopolymer, is investigated. Analysis of the theoretical expression based on the random phase approximation shows that the direction of the change in the transition temperature is determined by the length of the added homopolymer in relation to the length of the block copolymer and the overall composition of the monomers in the mixture. Small-angle x ray scattering measurements are performed with mixtures containing a styrene butadiene diblock copolymer and a polystyrene of various molecular weight. The observed shape of the scattered intensity curve, the angular position of the peak intensity, and the spinodal temperature for the micro-phase separation all agree well with the prediction from the theory. The values of the interaction energy density determined from the results agree fairly well with values determined previously from cloud point data. Keywords. Block copolymer, Order disorder transition, Miscibility, Polystyrene, Styrene butadiene block copolymer, Small angle X ray scattering.