Cross-linked poly(methyl methacrylate) (PMMA) microspheres have been successfully prepared by using the asymmetric cross-linker allyl methacrylate (AMA) via dispersion polymerization. The influence of the AMA amount and polymerization process on the PMMA particle size and morphology has been studied thoroughly. It was found that micron-sized, cross-linked PMMA particles with narrow size distributions could be obtained by a semi-continuous process with the asymmetric cross-linker AMA. The obtained micron-sized, cross-linked PMMA particles could be further used as a light diffusion agent in a polycarbonate matrix, and their light diffusion properties were significantly enhanced by increasing the gel content in the cross-linked particles. Moreover, the influence of the polymerization process, cross-linker content in PMMA and PMMA content in the polycarbonate matrix on light diffusion was carefully investigated. The results showed that the PMMA particles containing 5.0 wt% AMA, obtained by semi-continuous polymerization, had a higher haze and gel content and exhibited a better light diffusion effect than did the other particles. Graphical abstract We prepared cross-linked PMMA microspheres by dispersion polymerization with asymmetric cross-linker AMA and obtained light diffusers by blending cross-linked PMMA microspheres with matrix PC.

中文翻译：

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使用不对称交联剂通过分散聚合制备交联聚甲基丙烯酸甲酯微球及其在光漫射器中的应用

使用不对称交联剂甲基丙烯酸烯丙酯（AMA）通过分散聚合成功制备了交联聚（甲基丙烯酸甲酯）（PMMA）微球。已经深入研究了 AMA 用量和聚合过程对 PMMA 粒径和形态的影响。发现具有窄尺寸分布的微米级、交联的 PMMA 颗粒可以通过使用不对称交联剂 AMA 的半连续工艺获得。获得的微米级、交联的 PMMA 颗粒可以进一步用作聚碳酸酯基体中的光扩散剂，并且通过增加交联颗粒中的凝胶含量显着增强了它们的光扩散性能。此外，聚合过程的影响，仔细研究了光扩散下 PMMA 中的交联剂含量和聚碳酸酯基质中的 PMMA 含量。结果表明，通过半连续聚合获得的含有 5.0 wt% AMA 的 PMMA 颗粒具有更高的雾度和凝胶含量，并且表现出比其他颗粒更好的光扩散效果。图形摘要我们通过分散聚合与不对称交联剂 AMA 制备交联 PMMA 微球，并通过将交联 PMMA 微球与基质 PC 混合获得光漫射器。