Lyu Xiaolin, Tang Zhehao, Li Yujie, Xiao Anqi, Shen Zhihao, Zheng Shijun, Fan Xing-He
Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Key Laboratory of Advanced Materials Technologies, College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China.
Langmuir. 2021 Jan 12;37(1):509-515. doi: 10.1021/acs.langmuir.0c03179. Epub 2020 Dec 21.
The structural control of block copolymer (BCP) particles, which determines their properties and utilities, is quite important. Understanding the structural relationship between solution-cast samples and polymer particles in a confined space is necessary to precisely regulate the internal structure of polymer particles. Therefore, a facile method by choosing an appropriate selective solvent is reported to prepare spherical polymer particles with ordered network structures. The rod-coil BCP, poly(dimethylsiloxane)--poly{2,5-bis[(4-methoxyphenyl)-oxycarbonyl]styrene} (PDMS--PMPCS), was chosen as a model polymer because of its strong phase segregation ability. First, the structures of the BCP with a thermodynamically stable lamellar structure cast from different selective solvents were systematically studied. Then, a polymer particle with the same internal structure as that of the solution-cast sample can be easily prepared by self-assembling in an emulsion confined space. The relatively large particle size is of importance in this process because the large value of the particle size to periodicity ratio can provide a weak confined environment. This method helps us understand the inherent self-assembling mechanism of polymer particles in an emulsion confined space and accurately control the internal structure of the polymer particle obtained.
嵌段共聚物（BCP）颗粒的结构控制对于决定其性质和用途而言至关重要。了解溶液浇铸样品与受限空间内聚合物颗粒之间的结构关系，对于精确调控聚合物颗粒的内部结构是必要的。因此，本文报道了一种通过选择合适的选择性溶剂来制备具有有序网络结构的球形聚合物颗粒的简便方法。由于其较强的相分离能力，棒-线圈型BCP，聚（二甲基硅氧烷）-聚{2,5-双[（4-甲氧基苯基）-氧羰基]苯乙烯}（PDMS-PMPCS）被选为模型聚合物。首先，系统研究了由不同选择性溶剂浇铸而成的具有热力学稳定层状结构的BCP的结构。然后，通过在乳液受限空间内自组装，可以轻松制备出与溶液浇铸样品具有相同内部结构的聚合物颗粒。在此过程中相对较大的粒径很重要，因为粒径与周期性的比值较大可以提供一个弱受限环境。该方法有助于我们理解乳液受限空间内聚合物颗粒的固有自组装机制，并精确控制所得聚合物颗粒的内部结构。
