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首页> 外文期刊>Journal of Applied Polymer Science >Nano-SiO2/PMMA-PU composite particles with core- shell structure via emulsion polymerization and their application in epoxy resin
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Nano-SiO2/PMMA-PU composite particles with core- shell structure via emulsion polymerization and their application in epoxy resin

机译：乳液聚合的核壳结构纳米SiO2 / PMMA-PU复合颗粒及其在环氧树脂中的应用

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摘要

A novel method of nano-SiO2/poly(methyl methacrylate)(PMMA)-polyurethane(PU) composite particles modifying epoxy resin is reported. The composite particles with the obvious core-shell structure were prepared by emulsion polymerization of PMMA and PU prepolymer on the surface of nano-SiO2. The diameter of the composite particles was 50-100 nm with dark core SiO2 (30-60 nm) and light shell polymer of PMMA and PU (20-30 nm); moreover, PU was well distributed in PMMA with about 10 nm diameter. After nano-SiO2 was encapsulated by PMMA and PU, the Si content on the surface decreased rapidly to 2.08% and the N content introduced by PU was about 1.27%. The ratio of polymer to original nano-SiO2 (f(p)), the grafting ratio of polymer to original nano-SiO2 (f(r)) and the efficiency grafting ratio of polymer (f(e)) were, respectively, about 116.7%, 104.4%, and 89.5%. The as-prepared composite particles were an effective toughness agent to modify epoxy resin, and the impact strength of the modified epoxy resin increased to 46.64 kJ m(-2) from 19.12 kJ m(-2) of the neat epoxy resin. This research may enrich the field of inorganic nanoparticles with important advances toward the modification for polymer composite materials. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41919.
机译：报道了纳米SiO2 /聚甲基丙烯酸甲酯（PMMA）-聚氨酯（PU）复合粒子改性环氧树脂的新方法。通过PMMA和PU预聚物在纳米SiO2表面上乳液聚合制备了具有明显核壳结构的复合颗粒。复合颗粒的直径为50-100nm，具有深色核SiO 2（30-60nm）和PMMA和PU的轻壳聚合物（20-30nm）。另外，PU在直径约10nm的PMMA中分布良好。用PMMA和PU包裹纳米SiO2后，表面Si含量迅速下降至2.08％，PU引入的N含量约为1.27％。聚合物与原始纳米SiO2的比率（f（p）），聚合物与原始纳米SiO2的接枝比率（f（r））和聚合物的有效接枝比率（f（e））分别约为116.7％，104.4％和89.5％。所制备的复合颗粒是改性环氧树脂的有效增韧剂，改性环氧树脂的冲击强度从纯环氧树脂的19.12 kJ m（-2）增加到46.64 kJ m（-2）。这项研究可能会丰富无机纳米粒子的领域，并在聚合物复合材料的改性方面取得重要进展。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41919。

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