两性聚乙烯导致无表面活性剂的热敏纳米粒子
Vladimir A Kryuchkov1, Jean-Christophe Daigle, Kirill M Skupov
1Département de Chimie, Pavillon J.A. Bombardier, Universite de Montréal, CP 6128, Succursale Centre Ville, Montréal, QC, H3C 3J7, Canada.
Journal of the American Chemical Society
|October 16, 2010
概括
乙烯和烯酸 (PEAA) 的线性共聚合物形成稳定的水性纳米粒子. 这些碳酸盐稳定纳米粒子在水中表现出可逆的热敏反应行为.
科学领域:
- 聚合物化学 聚合物化学
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
背景情况:
- 乙烯和烯酸 (PEAA) 的线性共聚合物通过催化聚合合成.
- 这些共聚物体在其晶体结构中包含碳酸 (COOH) 基,形成分子内键.
研究的目的:
- 开发一种没有表面活性剂的方法,从PEAA中制造稳定的水性纳米粒子悬浮物.
- 描述这些PEAA纳米粒子的形态和特性.
- 为了研究PEAA纳米颗粒在水性介质中的热反应行为.
主要方法:
- 乙烯和三乙烯酸的催化聚合,然后进行水解.
- 溶剂交换协议,以创建水性纳米粒子悬浮物.
- 使用差分扫描热度计 (DSC),里埃变换红外光谱 (FTIR),X射线衍射 (XRD),传输电子显微镜 (TEM) 和动态光散射 (DLS) 的表征.
主要成果:
- 在没有表面活性剂的情况下成功合成了PEAA纳米颗粒,形成了合稳定的水性悬浮液.
- 这些纳米颗粒是单晶,具有延长的形状 (极半径:49 nm,赤道半径:9 nm).
- 颗粒表面的碳酸基团稳定了水中的纳米颗粒,它们在25-80°C之间表现出可逆的热敏反应行为.
结论:
- 一种新的,没有表面活性剂的方法产生稳定的水性PEAA纳米粒子.
- 这些纳米粒子具有明确的晶体结构和大小,由表面的碳酸基团稳定.
- 证明的热敏反应行为为水系统中的应用提供了可能性.
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