标题：MesoDyn modeling study of the phase morphologies of miktoarm poly(ethylene oxide)-b-poly(methyl methacrylate) copolymers doped with nanoparticles
作者：Dan Mu;Jian-Quan Li;Sheng-Yu Feng
作者机构：[Mu, D] School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China, College of Chemistry, Chemical Engineering and Materi 更多
通讯作者地址：[Mu, D]Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Shandong, Peoples R China.
关键词：PEO-b-PMMA copolymer;phase morphology;nanoparticles;microscopic phase separation
摘要：Earlier studies have shown that poiy(ethylene oxide) (PEO) and poly(methyl methacrylate) (PMMA) blocks are compatible at 270 and 298 K, and that their Flory-Huggins interaction parameters have the same blending ratio dependence at both temperatures. At a much higher temperature (400 K), the behavior of PEO/PMMA blends is strikingly different as both components become incompatible, while the Flory-Huggins parameters are low. Here we investigate the effect of doping with nanoparticles on the degree of incompatibility of twelve miktoarm PEO-b-PMMA copolymers at 400 K. Since PEO tends to be semicrystalline and long chains aggregate easily, PEO-rich and long-chain copolymer blends feature the highest degree of incompatibility for all nanoparticle arrangements and present cubic phase morphologies. In addition, the largest nanoparticles can reinforce the microscopic phase separation of all PEO-b-PMMA copolymers. This shows that the main factor affecting the phase morphology is the size of the nanoparticles. Also, only the asymmetric Da3-type PEO-rich copolymers show a hexagonal cylindrical phase morphology, which illustrates the effect induced by the nanoparticles on the microscopic phase separation changes of the PEO-b-PMMA copolymers. These induced effects are also related to the composition and molecular architecture of the copolymers.