Tuning the thermodynamic behavior and phase separating morphology of dynamically asymmetric LCST blends through the self-assembly of hydrophilic spherical nanoparticles

سال انتشار: 1393
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 376

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شناسه ملی سند علمی:

ISPST11_406

تاریخ نمایه سازی: 6 اردیبهشت 1396

چکیده مقاله:

In this study we investigated the effect of hydrophobic R974 Aerosil spherical nanoparticles as a potential i- to control kinetics of phase separation by slowing down or arresting the domain growth ii- to induce preferred phase separating morphology by tuning the dynamic asymmetry. Nanoparticles considerably slowed down phase separation for different mechanisms (NG, SD, and VPS) at a low volume fraction of 0.5% which was intensified as the volume fraction was increased. Remarkably, at 2 vol% of R974 nanoparticles the dynamic asymmetry increased considerably and thermodynamically controlled phase separation mechanisms (NG and SD) changed to VPS mechanism. At 2 vol% nanoparticle phase separation was arrested and a stable percolating network structure induced by VPS and a stable co-continuous structure induced by SD were formed in presence of R974 nanoparticles. TEM images indicated that double percolated structures were induced in presence of 2 vol% of the R974 nanoparticle through the PS-rich one

نویسندگان

Jafar Khademzadeh Yeganeh

Polymer Engineering Group, Faculty of Engineering, Qom University of Technology, Qom, Iran

Fatemeh Goharpey

Department of Polymer Engineering, Amirkabir University of Technology, Tehran, Iran

Reza Foudazi

Department of Chemical and Material Engineering, New Mexico State University, Las Cruces, New Mexico, 88003, USA