Controlling the Kinetics of Viscoelastic Phase Separation through Self-Assembly of Spherical Nanoparticles or Block Copolymers
- سال انتشار: 1393
- محل انتشار: یازدهمین سمینار بین المللی علوم و تکنولوژی پلیمر
- کد COI اختصاصی: ISPST11_409
- زبان مقاله: انگلیسی
- تعداد مشاهده: 625
نویسندگان
Polymer Engineering Group, Faculty of Engineering, Qom University of Technology, Qom, Iran
Department of Polymer Engineering, Amirkabir University of Technology, Tehran, Iran
Department of Chemical and Material Engineering, New Mexico State University, Las Cruces, New Mexico, 88003, USA
چکیده
The viscoelastic phase separation (VPS) can produce a network structure of the minor phase, which needs to be stabilized for designing a heterogeneous structure with desired mechanical and electrical functions. In this work, we investigate the stabilization of the VPS-induced network structure in dynamically asymmetric PS/PVME blend by incorporation of SEBS-g-MA block copolymer or dimethyldichlorosilane modified nanosilica. The SEBS-g-MA by localization at the interface retards volume shrinking process and slows down the kinetics of phase separation. Consequently, in the late stage of VPS, phase inversion occurs at longer times with respect to the neat blend due to the decreased interfacial tension. In contrast, hydrophobic nanoparticles self-assemble in the bulk of PS-rich phase and restrain the dynamics of polymer chains which enhances dynamic asymmetry. The efficiency of nanoparticles is found to be superior compared with block copolymer-based compatibilizers indicating the significance of chain dynamics in controlling the kinetics of phase separation. Beyond a critical volume fraction of nanoparticles, phase separation is pinned due to percolation of nanoparticles within the PS-rich phase, yielding a kinetically trapped VPS-induced network structureکلیدواژه ها
Viscoelastic phase separation, Rheology, Hydrophilic nanoparticles, Block copolymerاطلاعات بیشتر در مورد COI
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