不同中和度聚苯乙烯-丙烯酸粒子的聚乙二醇悬液剪切增稠特性研究
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摘要
实验采用无皂乳液聚合法,以NaHCO_3为中和剂,合成了一系列不同中和度的聚苯乙烯-丙烯酸(PS-AA)粒子。分别通过一步法、两步法合成了两种PS-AA粒子,并通过扫描电镜(SEM)观察了两种粒子的微观形貌。采用高能球磨法将粒子分散到聚乙二醇中,制备得到PS-AA/PEG剪切增稠液(STF),并通过动态流变仪稳态扫描测试了其聚乙二醇悬液的剪切增稠特性,结果表明用两步法合成的粒子作分散相可制备出优良的剪切增稠液。通过红外光谱、热重-DSC、扫描电镜、激光粒度分布仪对不同中和度的粒子进行了表征,并通过动态流变仪对其聚乙二醇悬液流变性能进行表征。结果表明,实验成功合成了不同中和度且表面光滑、粒径均一的核壳状的PS-AA粒子,并以此制备出性能优异的剪切增稠液,得出最优中和度为45%和50%。其中50%中和度PS-AA粒子,其质量浓度为64%的聚乙二醇悬液最大粘度高达2 200Pa·s,该性能在抗外力防护领域研究成果内出类拔萃。
Emulsifier free emulsion polymerization was used,with NaHCO_3 as neutralizing agent,respectively,by one step,two step synthesis,two kinds of polystyrene and acrylic particles(PS-AA)were produced,and by scanning electron microscopy(SEM)observation and contrast analysis the morphology of two kinds of particles.The particles dispersed in polyethylene glycol by high-energy ball milling method,preparation of PS-AA/PEG shear thickening fluid(STF),and through the analysis of steady state dynamic rheometer,scanning test shear thickening behavior of the polyethylene glycol suspension,preparation of polymer particles to study using two step method;by infrared spectroscopy,scanning electron microscopy,thermogravimetric-DSC.Laser particle size distribution instrument of different degrees of neutralization particles were characterized by the characterization of the dynamic rheometer suspension rheological properties of polyethylene glycol.The results showed that different degree of neutralization of PSAA core-shell particles was synthesized with smooth surface,uniform particle size,and then shear thickening fluid was prepared,and the optimal degree of neutralization was 45% and 50%,of which 50% neutralization degree of PS-AA particles,the maximum viscosity of polyethylene glycol suspension concentration 64% up to 2 200 Pa·s,the performance in anti external protection field research results in the rise above the common herd.
Emulsifier free emulsion polymerization was used,with NaHCO_3 as neutralizing agent,respectively,by one step,two step synthesis,two kinds of polystyrene and acrylic particles(PS-AA)were produced,and by scanning electron microscopy(SEM)observation and contrast analysis the morphology of two kinds of particles.The particles dispersed in polyethylene glycol by high-energy ball milling method,preparation of PS-AA/PEG shear thickening fluid(STF),and through the analysis of steady state dynamic rheometer,scanning test shear thickening behavior of the polyethylene glycol suspension,preparation of polymer particles to study using two step method;by infrared spectroscopy,scanning electron microscopy,thermogravimetric-DSC.Laser particle size distribution instrument of different degrees of neutralization particles were characterized by the characterization of the dynamic rheometer suspension rheological properties of polyethylene glycol.The results showed that different degree of neutralization of PSAA core-shell particles was synthesized with smooth surface,uniform particle size,and then shear thickening fluid was prepared,and the optimal degree of neutralization was 45% and 50%,of which 50% neutralization degree of PS-AA particles,the maximum viscosity of polyethylene glycol suspension concentration 64% up to 2 200 Pa·s,the performance in anti external protection field research results in the rise above the common herd.
引文
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3 Kamibayashi M,Ogura H,Otsubo Y.Shear-thickening flow of nanoparticle suspensions flocculated by polymer bridging[J].Journal of Colloid and Interface Science,2008,321(2):294.
4 叶芳.聚苯乙烯-丙烯酸粒子基剪切增稠液的制备与性能研究[D].合肥:中国科技大学,2014:39.
5 Ye F,Zhu W,Jiang WQ,et al.Influence of surfactants onshearthickening behavior in concentrated polymer dispersions[J].Journal of Nanoparticle Research,2013,15:2122.
6 Jiang W Q,Ye F,He Q Y,et al.Study of the particles’structure dependent rheological behavior for polymer nanospheres based shear thickening fluid[J].Journal of Colloid and Interface Science,2014,413(3):8.
7 Paine A J.Dispersion polymerization of styrene in polar solvents:A simple mechanisticmodel to predict particle size[J].Macromolecules,1990,23(12):3109.
8 Teare D O H,Emmison N,Ton-That C,et al.Effects of serum on the kinetics of CHO attachment to ultraviolet-ozone modified polystyrene surfaces[J].Journal of Colloid and Interface Science,2001,234(1):84.
9 王新平,陈志方.端羟基化聚苯乙烯的表面性质[J].高等学校化学学报,2005,26(9):1752.
10 Song J S,Chagal L,Winnik M A.Monodisperse,micrometer-size,carboxyl-functionalizedpolystyrene particles obtained by two-stagedispersionpolymerization[J].Macromolecules,2006,39(17):5729.
11 Li J,Li H M.Functionalization of syndiotactic polystyrene with succinic anhydride in the presence of aluminum chloride[J].European Polymer Journal,2005,41(4):823.
12 吴升红,光普仪.单分散聚(苯乙烯-丙烯酰胺)高分子微球的制备及性能[J].高分子材料科学与工程,2010,26(6):156.
13 Maranzano B J,Wagner N J.Flow-small angle neutron scatteringmeasurements of colloidal dispersion microstructure evolution through the shear thickening transition[J].Chemical Physics,2002,117:10291.
14 Maranzano B J,Wagner N J.The effect of interparticleinteractionsand particle size on reversible shear thickening:Hard-sphere colloidaldispersions[J].Journal of Rheology,2001,45:1205.
15 Hoffmann R L.Explanations for the cause of shear thickening inconcentrated colloidal suspensions[J].Journla of Rheology,1998,42:111.
16 潘冬俊,杨文盼.静电凝聚法制备苯乙烯-丙烯酸共聚物/氧化铈核壳纳米复合材料[J].材料导报:研究篇,2015,29(3):71.
17 郑文.颗粒物质体系复杂动力学行为研究[D].中国科学技术大学,2013.
18 秦建彬,张广成.剪切增稠液及其复合材料[J].材料导报:综述篇,2017,31(4):59.
19 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,2015,31:1.
20 Lim A S,Lopatnikov S L,Wagner N J,et al.Investigating the transient response of a shear thickening fluid using the split Hopkinson pressure bar technique[J].Rheologica acta,2013,V49(8):879.