纳米SiO_2-聚乙二醇分散体系的分散性及流变行为研究  

Study on Dispersion and Rheology Behavior of Nano-SiO_2-Polyethylene Glycol Dispersion System

作　　者：徐素鹏[1] 张玉芳[2] 

机构地区：[1]济源职业技术学院冶金化工系,济源454650 [2]北京服装学院科技处,北京100029

出　　处：《北京服装学院学报（自然科学版）》2011年第4期15-20,共6页Journal of Beijing Institute of Fashion Technology：Natural Science Edition

基　　金：北京市教委科技创新平台建设项目(PXM2008_014216_053705)

摘　　要：为了减轻个体防刺装甲质量、增加其穿着舒适性,人们尝试将具有剪切增稠作用的剪切增稠液体(STF)用于改性防护织物.理想的STF取决于流体的分散性与流变行为.本文选用市售国产纳米SiO2、聚乙二醇(PEG)及硅烷偶联剂A1120,采用球磨方法配制分散体系,通过考察球磨时间、分散剂用量等因素考察该体系的分散性和流变性.流体的分散性与流变行为影响因素实验结果表明:延长球磨时间和增加分散剂含量,可有效防止纳米SiO2团聚,提高其分散性;当分散剂含量较低时,随着球磨时间延长、分散剂含量增加、分散相含量增加,纳米SiO2-聚乙二醇分散体系都具有明显的先剪切变稀后剪切增稠的效果;而当分散剂含量过大时,体系则是先剪切增稠后剪切变稀.In order to reduce the weight of stab-resistant body armor and enhance it＇ s comfort, the scientists try to modify the resistant fabric by shear thickening fluid（STF） ; However, in order to get ideal STF, the critical factors are fluid＇ s dispersion behavior and rheology behavior. This paper prepares dispersion system by high-energy planetary ball milling with commercial domestic nano- SiO2 ,polyethylene glycol（ PEG）, silane coupling agent A1120. Through investigating the influence of the time of ball milling, dispersant content, etc, the dispersion and rheology behavior of the sys- tem was studied. Results show that prolonging the ball milling time and increasing dispersant content can effectively decrease the aggregation of nano-SiO2, increase its dispersion behavior. When the dispersant content is low, prolonging the ball milling time,increasing dispersant content and increasing dispersed phase content result in obvious behavior of nano-SiO2-polyethylene glycol dispersion which has shear thinning first and then shear thickening; when the dispersant content is high, the dispersion exhibits shear thickening first and secondly shear thinning.

关 键 词：纳米SiO2-聚乙二醇分散体系 剪切增稠液体 分散性 流变行为 

分 类 号：TB383[一般工业技术—材料科学与工程]