利用颗粒大小分离来调整涂料中的分子添加剂分布.
Huyen Le1, Timothy J Murdoch1, Aitor Barquero2
1Department of Materials, Loughborough University, Leicestershire LE11 3TU, U.K.
概括
控制聚合物涂层中的小分子添加剂分布是性能的关键. 双模体合物混合物和干燥条件有效调整添加剂的位置和缓慢释放,增强功能薄膜设计.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 表面科学是一门学科.
背景情况:
- 聚合物涂层中小分子添加剂的空间分布显著影响性能,包括抗微生物和耐腐蚀性.
- 虽然纳米粒子和聚合物分布控制已经建立,但涂料中的分子添加剂定位仍未得到充分探索.
研究的目的:
- 研究使用双模合体混合物来控制在聚合物涂层干燥过程中模型分子添加剂-二 (NiPc) 的空间分布.
- 了解颗粒大小分布和干燥条件如何影响添加剂定位和释放动力学.
主要方法:
- 利用互补显微镜和光谱技术,分析由双模态合体混合物形成的聚合物薄膜内的NiPc分布.
- 研究了不同相对湿度和干燥速度对添加物分层和局部化的影响.
- 通过Korsmeyer-Peppas模型进行释放研究和拟合数据,以确定扩散机制.
主要成果:
- 由于表面积较大,--II) 酸 (NiPc) 首选与双模混合物中的较小颗粒相关.
- 低至中等湿度干燥导致薄膜表面的NiPc丰富 (小至顶层分层).
- 在高湿度下缓慢干燥导致NiPc通过颗粒聚合和沉积在基质附近积累.
- 与单模膜相比,双模膜的初始NiPc爆发释放速度较慢,表明持续的输送.
结论:
- 在体混合物中的颗粒大小分布和蒸发率是调节分子添加剂位置和释放在聚合物涂层中的关键可调节参数.
- 这种方法为设计具有针对医疗,海洋和保护技术应用的特性的功能性涂层提供了一种多功能策略.
- 菲克的扩散被确定为主要的释放机制,受涂层孔隙结构的影响.
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