| 纳米SiO_2对PDMS/PIB不相容共混物在低剪切速率下凝聚行为的影响 |
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| 引用本文： | 刘成蕾,佟伟,黄亚江,程小莲,侯康,杨其.纳米SiO_2对PDMS/PIB不相容共混物在低剪切速率下凝聚行为的影响[J].高分子学报,2009,0(12):1219-1225. |
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| 作者姓名： | 刘成蕾 佟伟 黄亚江 程小莲 侯康 杨其 |
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| 作者单位： | 四川大学高分子科学与工程学院,高分子材料与工程国家重点实验室,成都,610065 |
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| 基金项目： | 教育部科学技术研究重点项目(项目号106133)资助 |
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| 摘 要： | 借助在线剪切-显微装置研究了简单剪切流场下疏水纳米二氧化硅(SiO2)粒子对聚二甲基硅氧烷/聚异丁烯(PDMS/PIB=90 wt%∶10 wt%)不相容共混物实时结构演变过程的影响.研究表明,分散相尺寸的大小及其分布由粒子含量和剪切速率共同决定.少量纳米SiO2的加入能够抑制PIB分散相的凝聚,分散相的尺寸随着纳米SiO2含量的增大而减小,并且呈现出双峰分布.但随着SiO2粒子含量的进一步增加,分散相尺寸的双峰分布现象逐渐消失.SiO2的加入还导致PIB分散相对剪切速率的依赖性降低.当SiO2粒子含量低于2.5wt%时,较高的剪切速率凝聚得到的分散相的尺寸较大;当SiO2粒子含量超过2.5 wt%后,低速和高速剪切速率下凝聚得到的分散相尺寸基本相同.粒子的包覆、分散相的破碎和凝聚是出现以上现象的根本原因.
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| 关 键 词： | 不相容高分子共混物 简单剪切 凝聚 纳米二氧化硅 |
| 收稿时间： | 2008-11-13 |
INFLUENCE OF SILICA NANOPARTICLES ON THE COALESCENCE OF IMMISCIBLE PDMS/PIB BLENDS UNDER LOW-RATE SHEAR FLOW |
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| LIU Chenglei,TONG Wei,HUANG Yajiang,CHENG Xiaolian,HOU Kang,YANG Qi.INFLUENCE OF SILICA NANOPARTICLES ON THE COALESCENCE OF IMMISCIBLE PDMS/PIB BLENDS UNDER LOW-RATE SHEAR FLOW[J].Acta Polymerica Sinica,2009,0(12):1219-1225. |
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| Authors: | LIU Chenglei TONG Wei HUANG Yajiang CHENG Xiaolian HOU Kang YANG Qi |
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| Institution: | College of Polymer Science and Engineering;Sichuan University;State Key Laboratory of Polymer Material and Engineering;Chengdu 610065 |
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| Abstract: | The effects of hydrophobic SiO_2 nanoparticles on the real-time morphology evolution of the immiscible blend of polydimethylsiloxane(PDMS)/polyisobutylene(PIB)(90 wt%:10 wt%) were investigated under simple shear flow with an online optical-shear system.The theoretical predication indicated that SiO_2 particles were mainly trapped in the interface between two phases.It was found that the droplet size of PIB dispersed phases was determined by the content of SiO_2 nanoparticles and shear rate.The coverage of S... |
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| Keywords: | Immiscible polymer blends Shear flow Coalescence Silica nanoparticles |
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