文献类型：期刊文献

英文题名：Distinctive phase separation dynamics of polymer blends: roles of Janus nanoparticles

作者：Li, Qing[1];Wang, Liquan[1];Lin, Jiaping[1];Zhang, Liangshun[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, State Key Lab Bioreactor Engn, Minist Educ,Sch Mat Sci & Engn,Key Lab Ultrafine, Shanghai 200237, Peoples R China

年份：2019

卷号：21

期号：5

起止页码：2651

外文期刊名：PHYSICAL CHEMISTRY CHEMICAL PHYSICS

收录：;EI(收录号：20201708550031);WOS:【SCI-EXPANDED(收录号:WOS:000461667900044)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 51621002, 21474029, and 21774032). Support from Projects of Shanghai municipality (No. 16520721900) and the Fundamental Research Funds for the Central Universities (222201714042) is also appreciated.

语种：英文

外文关键词：Block copolymers - Nanoparticles - Polymer blends - Phase separation - Compatibilizers

摘要：Janus nanoparticles (JPs), which are anisotropic nanoparticles with at least two opposite surface regions, have been demonstrated as highly efficient compatibilizers for polymer blends. However, there are still a number of open questions concerning the mechanism behind the influence of JPs on the phase separation dynamics of polymer blends. Herein, we report a counter-intuitive feature of JPs concerning their roles during spinodal decomposition (SD); that is, they promote the decomposition of unlike polymers in the early stage of SD but retard it during the late stage. This is in remarkable contrast to traditional compatibilizers such as block copolymers and homogenous nanoparticles, which impede phase separation during both stages. We further demonstrate that the unique promoting effect of JPs at early times is due to the formation of microphase-separated homopolymer-rich regions in the vicinity of opposite JP surface regions. Our findings are expected to have important implications for the phase separation behavior of JP-compatibilized polymer blends, whose morphologies and performance could be controlled by tuning the interactions between the constituent polymers and JP-based compatibilizers.