Effect of Silica Nanoparticles on the Morphology of Immiscible PIB/PDMS Blends in Confined Shear Flow

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (12): 2896.

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Effect of Silica Nanoparticles on the Morphology of Immiscible PIB/PDMS Blends in Confined Shear Flow

PENG Xiao-Juan, HUANG Ya-Jiang*, HE Yu-Song, LUO Yong, YANG Qi, LI Guang\|Xian

College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China

Received:2011-03-30 Revised:2011-05-07 Online:2011-12-10 Published:2011-11-25
Contact: HUANG Ya-Jiang E-mail:hyj@scu.edu.cn
Supported by:
国家自然科学基金(批准号: 51003062)资助.

Abstract

Abstract: The morphology development in immiscible polymer blends under confined shear flow(such as in the field of micro-processing) usually differs significantly to that observed in bulk conditions. In this work, the effect of silica nanoparticles with different surface properties on the morphology development of immiscible polyisobutylene(PIB)/polydimethylsiloxane(PDMS)(10:90) blends under confined shear flow was investigated. The confined environment was created by an optical-shear cell united system. It was found that the addition of only a very small amount(0.2%) of hydrophobic SiO2 nanoparticles could suppress the coalescence of dispersed droplets effectively and thus decreased the confinement degree of droplets. As a result, the formation of the superstructures(such as pearl necklaces and strings), as presented in the pure PIB/PDMS blends, were prevented and the blends displayed a near bulk behavior. On the contrary, the blends with the addition of small amount of hydrophilic SiO2 nanoparticles still formed superstructures of dispersed droplets under shear flow. Bulk behavior of dispersed phase could only be obtained with higher concentration of the hydrophilic SiO2 nanoparticles and under higher shear rate.

Key words: Polyisobutylene/polydimethylsiloxane(PIB/PDMS), SiO2 nanoparticle, Confinement, Shearing, Phase morphology

CLC Number:

O631.1+1

TrendMD:

PENG Xiao-Juan, HUANG Ya-Jiang*, HE Yu-Song, LUO Yong, YANG Qi, LI Guang\|Xian. Effect of Silica Nanoparticles on the Morphology of Immiscible PIB/PDMS Blends in Confined Shear Flow[J]. Chem. J. Chinese Universities, 2011, 32(12): 2896.

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Effect of Silica Nanoparticles on the Morphology of Immiscible PIB/PDMS Blends in Confined Shear Flow

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