羧基化改性聚苯乙烯微球的制备及对其聚乙二醇悬液的剪切增稠特性
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摘要
以丙烯酸(AA)为改性剂,采用无皂乳液聚合的方法将其聚合接枝于聚苯乙烯(PS)微粒表面。使用红外光谱仪、热分析仪分析了其物性结构,使用扫描电子显微镜观察了粒子直径及阵列,使用接触角测量仪对比测试了PS粒子改性前后的接触角,分析了表面接枝基团对粒子亲水性能的影响。结果表明,改性后的PS粒子平均粒径为250 nm,表面富含羧基,亲水性得以改善。通过高能球磨法将合成的羧基化PS粒子分散在聚乙二醇200中,得到一种有机高分子体系的剪切增稠液(STF),分别采用动态流变仪和扩散波谱仪对其机械流变性能和微流变性能进行了测试,二者所测数据均表明流体具有显著的剪切增稠特性。
Acrylic acid was used as modifier to prepare a kind of hydroxyl terminated core-shell particles in aqueous phase. Its physic-chemical structure was analyzed by infrared spectroscopy,thermal analysis,scanning electron microscopy and contact angle instrument. The results show that the modified PS particles have an average diameter of 250 nm and its hydrophilic is improved by the surface carboxyl. Product particles were dispersed in the polyethylene glycol 200 through the experiment of high-energy ball milling method so that a new organic polymer shear thickening fluid( STF)was got. The shear thickening behavior was tested by the dynamic rheometer and diffusion spectroscopy. The data of the two tests indicate that the fluid has significant shear thickening characteristics.
Acrylic acid was used as modifier to prepare a kind of hydroxyl terminated core-shell particles in aqueous phase. Its physic-chemical structure was analyzed by infrared spectroscopy,thermal analysis,scanning electron microscopy and contact angle instrument. The results show that the modified PS particles have an average diameter of 250 nm and its hydrophilic is improved by the surface carboxyl. Product particles were dispersed in the polyethylene glycol 200 through the experiment of high-energy ball milling method so that a new organic polymer shear thickening fluid( STF)was got. The shear thickening behavior was tested by the dynamic rheometer and diffusion spectroscopy. The data of the two tests indicate that the fluid has significant shear thickening characteristics.
引文
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[14]Maranzano B J,Wagner N J.The effect of interparticle interactions and particle size on reversible shear thickening:hard-sphere colloidaldispersions[J].J.Rheol.,2001,45:1205-1222.
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[16]Tingey K G,Andrade J D.Probing surface microheterogeneity of poly(ether urethanes)in an aqueous environment[J].Langmuir,1991,7:2471-2478.
[17]郑文.颗粒物质体系复杂动力学行为研究[D].合肥:中国科学技术大学,2013.Zheng W.Study on complex dynamic behavior of granular material system[D].Hefei:University of Science&Technology China,2013.
[18]康万利,杨红斌.粘弹微球的合成及分散体系的流变性能[J].高分子材料科学与工程,2015,31(3):1-5.Kang W L,Yang H B.Synthesis and rheological properties of viscoelastic microspheres[J].Polymer Materials Science&Engineering,2015,31(3):1-5.
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