两亲性棒−线二嵌段共聚物溶液的聚集行为  

Aggregation behavior of amphiphilic rod-coil diblock copolymer solutions

作　　者：孙振贺 韩向刚[1] SUN Zhen-he;HAN Xiang-gang(School of Physics,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Monggol Autonomous Region,China)

机构地区：[1]内蒙古科技大学理学院,内蒙古包头014010

出　　处：《云南大学学报（自然科学版）》2023年第3期666-673,共8页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金(22163005).

摘　　要：为了明确分子链刚性对嵌段共聚物聚集行为的影响,利用格子自洽场方法,研究了棒−线二嵌段共聚物选择性溶液的自组装行为.通过计算热容曲线,发现不同的平均体积分数条件下系统的聚集结构行为是明显不同的.在低平均体积分数和中等平均体积分数体系,热容曲线上出现多个聚集峰,这说明聚集行为出现了多重重排,即通过胶束形貌转变来实现胶束生长;在相对高平均体积分数和高平均体积分数体系,平均体积分数增加造成胶束结构重排行为明显减弱,没有观察到形貌变化引起的结构转变出现,仅出现近立方胶束有序/无序转变,甚至在高平均体积分数出现了胶束融合现象.这些结果表明,刚性棒对嵌段共聚物自组装行为有显著影响,并且它与平均体积分数密切有关.In order to investigate the effect of molecular chain rigidity on the aggregation behavior of block copolymers,the self-assembly behavior of rod-coil diblock copolymers in selective solvents was investigated using the lattice self-consistent field theory.By calculating the heat capacity curve,it is found that the aggregation structure of the system varies with temperature under different concentration conditions.At low and intermediate concentrations,multiple aggregation peaks appear on the heat capacity curves,indicating that the aggregation behavior appears multiple rearrangements.Namely,the micellar growth was realized through morphologcial transformation.At relatively high and high concentrations,the micellar structure adjustment behavior was significantly weakened due to the increase in concentration,and no morphological transformation is observed,but only quasi-cubic micellar ordered/disordered transformation is observed,and even micellar fusion occurs at high concentrations.These results indicate that the rigid rod has a significant effect on the self-assembly behavior of block copolymers which is closely related to concentration.

关 键 词：两亲性嵌段共聚物 胶束 自洽场方法 刚性嵌段 

分 类 号：O411[理学—理论物理]