A novel method to control microcapsule release behavior via photo‐crosslink polyurethane acrylate shells
A novel method to control microcapsule release behavior via photo‐crosslink polyurethane acrylate shells
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DOI：
10.1002/app.29604
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发表时间：
2009-07
影响因子：
3
通讯作者：
Xiao Wang;Gangqiang Li;Jie Wei;Weiwen Guan
中科院分区：
文献类型：
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作者：
Xiao Wang;Gangqiang Li;Jie Wei;Weiwen Guan
以丙烯酸聚氨酯二异氰酸酯（PUA）和水为原料，采用界面聚合法制备了以聚氨酯丙烯酸酯（普阿）为壳层的微胶囊体系。微胶囊的尺寸受保护胶体浓度和丙烯酸聚氨酯二异氰酸酯性质的影响。当聚乙烯醇（PVA）浓度为5%，TDI与丙烯酸聚氧乙烯醚季戊四醇（PP 50）的摩尔比为1.50时，微胶囊的平均粒径仅为3.3223 μm。紫外光照射30 min可有效地阻止普阿微胶囊包埋的4-羟基-4 '-异丙氧基二苯砜（D-8）在溶液中的释放。用亮度（L *）测定了普阿微胶囊中D-8与2-苯胺基-6-二丁氨基-3-甲基荧烷（ODB-2）在热处理条件下反应的颜色变化。在干燥状态下，辐照后的普阿微胶囊比未辐照的微胶囊更难释放D-8。
A microcapsule system with polyurethane acrylate (PUA) shell is prepared by interfacial polymerization between acrylic polyurethane diisocyanate and water to achieve controlled release via UV irradiation. The size of the microcapsule is influenced by the concentration of protecting colloid and property of acrylic polyurethane diisocyanate. When concentration of polyvinyl alcohol (PVA) is 5% and molar ratio of TDI and acrylic ethoxylated pentaerythritol (acrylic PP50) rises to 1.50, average diameter of the microcapsule is only 3.3223 μm. Delivery of 4-hydroxy-4'-isopropoxydiphenylsulfone (D-8) encapsuled by PUA microcapsule in solution can be prevented effectively by 30-min UV irradiation. Lightness (L * ) is used to measure color changes of reaction between D-8 in PUA microcapsule and 2-anilino-6-dibutylamino-3-methylfluoran (ODB-2) under thermal treatment. In dry state, irradiated PUA microcapsules are much harder to release D-8 than those not irradiated.