醇功能化TiO2作为反应性纳米吸收剂,用于从水borne聚合物分散中去除残留单体
Ana Trajcheva1, Pablo Morales1, Justine Elgoyhen1
1POLYMAT and Departamento de Química Aplicada, Facultad de Ciencias Químicas, University of the Basque Country UPV/EHU, Joxe Mari Korta Zentroa, Tolosa Etorbidea 72, Donostia, San Sebastián 20018, Spain.
概括
硫醇功能化二氧化纳米颗粒有效地从乳涂层中去除残留的甲基甲酸盐 (MMA) 和丁酸盐 (BA) 单体. 这种创新方法提高了机械性能,并大大降低了单体含量.
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
- 纳米技术纳米技术
背景情况:
- 水性聚合物分散 (乳) 中的甲基甲酸盐 (MMA) 和丁酸盐 (BA) 等残留单体可以影响涂层性能和安全性.
- 要达到严格的质量和环境标准,需要有效的清除策略.
研究的目的:
- 开发和评估二氧化 (TiO2) 纳米颗粒作为吸附剂,用于减少乳中的残留MMA和BA单体.
- 研究这些纳米颗粒对产生的聚合物涂层的分散,薄膜形成和机械性能的影响.
主要方法:
- 用 (3-mercaptopropyl) -triethoxysilane (MPTES) 来修改TiO2纳米粒子,以引入醇 (-SH) 组.
- 系统评估功能化密度,纳米粒子度和混合时间,以提高单体去除效率.
- 使用动态光散射 (DLS),传输电子显微镜 (TEM) 和泽塔电位分析进行纳米粒子分散,聚合和定位的表征.
- 评估最终聚合物薄膜的单体吸附 (可逆或不可逆) 和机械性能 (模量).
主要成果:
- 经过MPTES修改的TiO2纳米颗粒实现了高达90%的MMA去除和几乎完全的BA去除,将总残留单体从1900ppm降低到120ppm.
- 大约80-90%的吸附单体是化学结合的,这表明吸附是不可逆转的.
- 修改后的纳米颗粒在乳中显示出更好的分散和减少聚合,从而使薄膜分布均,并在聚合物颗粒表面上具有优越的定位.
- 结果的薄膜显示水的灵敏度没有变化,但Young的模量显著增加了75%.
结论:
- 醇功能化TiO2纳米粒子作为MMA/BA乳涂层中残留单体的有效反应性吸附剂.
- 功能化的纳米粒子增强了乳膜的机械性能,而不会影响水的灵敏性.
- 这项技术为生产高性能,低残留单体聚合物涂层提供了一个有前途的途径.
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