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为了改善激光惯性约束聚变用厚壁聚合物空心微球球形度和壁厚均匀性,文中在外水相(W2)引入聚丙烯酸(PAA),对比了不同相对分子质量PAA(L-PAA,H-PAA)与传统界面改性剂聚乙烯醇(PVA)对复合乳粒形变的影响及作用机理.结果表明,PVA通过亲疏水基团可有效稳定直径900 μm复合乳粒,但大幅度降低了油水界面张力,当乳粒直径增加,油相和内水相Laplace压力降低,变形增加,PVA对直径1900 μm复合乳粒稳定性下降;与PVA体系相比,LPAA体系油水界面张力大,但黏度与PVA体系基本相同,导致乳粒形成时维持力大于剥离力,不利于乳粒形成,且LPAA分子链相对较短,空间位阻较小,复合乳粒易融合、合并;H-PAA分子链长,空间位阻较大,不仅对大小直径复合乳粒稳定效果明显,而且其油水界面张力大,有利于乳粒球形化,提高了高球形度PS微球的产率.

参考文献

[1] Tucker-Schwartz, A.K.;Bei, Z.;Garrell, R.L.;Jones, T.B..Polymerization of electric field-centered double emulsion droplets to create polyacrylate shells[J].Langmuir: The ACS Journal of Surfaces and Colloids,201024(24):18606-18611.
[2] R. R. Paguio;S. P. Paguio;C. A. Frederick;A. Nikroo;O. Acenas.IMPROVING THE YIELD OF TARGET QUALITY OMEGA SIZE PAMS MANDRELS BY MODIFYING EMULSION COMPONENTS[J].Fusion science and technology: An international journal of the American Nuclear Society,20064(4):743-749.
[3] Lattaud, C.;Guillot, L.;Brachais, C.-H.;Fleury, E.;Legaie, O.;Couvercelle, J.-P..Influence of a density mismatch on TMPTMA shells nonconcentricity[J].Journal of Applied Polymer Science,20126(6):4882-4888.
[4] Meifang Liu;Sufen Chen;Xiao bo Qi.Improvement of wall thickness uniformity of thick-walled polystyrene shells by density matching[J].Chemical engineering journal,2014:466-476.
[5] 刘梅芳;陈素芬;刘一杨;苏琳;史瑞廷;漆小波;李波;张占文.厚壁空心微球的球形度和壁厚均匀性的表征研究[J].强激光与粒子束,2014(2):153-157.
[6] Xu JH;Li SW;Lan WJ;Luo GS.Microfluidic approach for rapid interfacial tension measurement[J].Langmuir: The ACS Journal of Surfaces and Colloids,200819(19):11287-11292.
[7] Duy Nguyen;Vittoria Balsamo.Emulsification of Heavy Oil in Aqueous Solutions of Poly(vinyl alcohol): A Method for Reducing Apparent Viscosity of Production Fluids[J].Energy & Fuels,2013Mar./Apr.(Mar./Apr.):1736-1747.
[8] Alvarez, N.J.;Walker, L.M.;Anna, S.L..A microtensiometer to probe the effect of radius of curvature on surfactant transport to a spherical interface[J].Langmuir: The ACS Journal of Surfaces and Colloids,201016(16):13310-13319.
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