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首页> 外文期刊>Journal of Applied Polymer Science >Encapsulation of N,N-diethyl-meta-toluamide (DEET) via miniemulsion polymerization for temperature controlled release
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Encapsulation of N,N-diethyl-meta-toluamide (DEET) via miniemulsion polymerization for temperature controlled release

机译：通过微型乳液聚合对温度控制释放的N，N-二乙基 - 甲磺酰胺（DEET）的封装

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摘要

N,N-diethyl-meta-toluamide (DEET), an insect repellent, can be successfully encapsulated in poly(n-butyl methacrylate-co-methyl methacrylate) nanospheres via direct miniemulsion polymerization. Stable and low polydisperse nanospheres with a number average diameter of 114 +/- 37nm were obtained. It is shown that DEET is an effective costabilizer and that sodium lauryl sulfate is a suitable surfactant. The nanospheres glass-transition temperature (T-g) can be tuned by adjusting the ratio between n-butyl methacrylate and methyl methacrylate in the monomer formulation. The repellent reduced the polymerization reaction rate and the copolymer molecular weight, and changed the nanoparticle morphology. The release rate of the encapsulated DEET provides repellency for over 9 h and is and more controlled when compared to the free DEET. Results show the mechanism of release is temperature dependent. At temperatures close to and lower than the polymer T-g, polymer relaxation is the limiting mechanism. At higher temperatures, Fickian diffusion limits the overall release. Thus, the DEET release rate can be tuned by adjusting the copolymer T-g. This ensures this material a great potential as temperature-dependent delivery system. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47139.
机译：N，N-二乙基 - 甲磺酰胺（DEET），驱虫剂，可通过直接小型乳液聚合成功地包封在聚（正丁基甲基丙烯酸甲酯 - 共聚甲基丙烯酸甲酯）纳米球中。获得了数均直径为114 +/- 37nm的稳定和低多分散纳米球。结果表明，DEET是一种有效的昂贵剂，并且十二烷基硫酸钠是合适的表面活性剂。通过调节甲基丙烯酸正丁酯与单体配方中甲基丙烯酸甲酯之间的比率，可以调节纳米球玻璃化转变温度（T-G）。避难剂降低了聚合反应速率和共聚物分子量，并改变了纳米颗粒形态。封装的DEET的释放速率提供超过9小时的排斥性，并且与自由湿度相比，并且更具控制。结果显示释放机制是温度依赖性。在接近和低于聚合物T-G的温度下，聚合物弛豫是限制机构。在较高温度下，Fickian扩散限制了整体释放。因此，可以通过调节共聚物T-G来调谐小释放率。这确保了这种材料作为温度相关的输送系统具有很大的潜力。 （c）2018 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47139。

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