Kim Chae Bin, You Nam-Ho, Goh Munju
Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST) Chudong-ro 92, Bongdong-eup Wanju-gun Jeonbuk-do 55324 Korea
RSC Adv. 2018 Mar 6;8(17):9480-9486. doi: 10.1039/c8ra00801a. eCollection 2018 Feb 28.
We herein report a facile and scalable approach to manufacturing optically transparent and heat-insulating films by incorporating hollow poly(methyl methacrylate) microcapsules into a transparent polymeric matrix. The microcapsule was prepared emulsion polymerization. The size of the microcapsules could be easily controlled from ∼1 to 3 μm by varying the polymerization time in a narrow size distribution. The microcapsules were then mixed with a UV-curable transparent liquid resin and cured by a subsequent light irradiation. The current approach could enhance the thermal barrier property of the films without a significant reduction in the optical transparency. The solid film possessing 30 wt% microcapsules, for example, exhibited a high visible light transmittance (∼80% as measured by UV-vis spectroscopy) and the thermal conductivity was reduced to 0.06 W mK, corresponding to 46% of the capsule free film. To quantify and verify this result, theoretical models describing a heat transfer in a hollow microsphere composite were used, and the model showed a good agreement with our experimental observations.
我们在此报告一种简便且可扩展的方法，通过将中空聚甲基丙烯酸甲酯微胶囊掺入透明聚合物基质中来制造光学透明且隔热的薄膜。微胶囊通过乳液聚合制备。通过在窄尺寸分布内改变聚合时间，微胶囊的尺寸可轻松控制在约1至3μm。然后将微胶囊与可紫外光固化的透明液体树脂混合，并通过随后的光照射进行固化。当前方法可增强薄膜的热阻隔性能，而不会显著降低光学透明度。例如，含有30 wt%微胶囊的固体薄膜表现出高可见光透射率（通过紫外可见光谱法测量约为80%），并且热导率降低至0.06 W mK，相当于无胶囊薄膜的46%。为了量化和验证这一结果，使用了描述中空微球复合材料中热传递的理论模型，该模型与我们的实验观察结果显示出良好的一致性。
