巨大的瓶刷块共聚物表面活性剂的水性自组装作为可调整形状的构建块
Ryan Fenyves1, Marc Schmutz, Ian J Horner
1Department of Chemistry, University at Buffalo, The State University of New York , Buffalo, New York 14260-3000, United States.
Journal of the American Chemical Society
|May 14, 2014
概括
具有瓶架构的巨大聚合物表面活性物自组装成统一的,可预测的纳米结构. 这种可控的组装使得各种微粒结构的合理制造具有增强的稳定性.
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:
- 精确的纳米材料制造依赖于分子构建块的编程自组装.
- 具有瓶架构的巨大聚合物表面活性剂代表了自组装研究的新型材料类.
研究的目的:
- 为了研究在水性环境中的两性瓶形刷块共聚合物的自我组装行为.
- 探索统一聚合物的形成及其结构和稳定性的特征.
主要方法:
- 通过从接种方法合成两性瓶形刷块共聚合物 (聚酸-聚乙烯氧化物).
- 低温传导电子显微镜 (cryo-TEM) 用于自组装聚合物的结构分析.
- 估计聚合物结构数据以确定包装参数.
主要成果:
- 形成均的球状小粒 (核心半径19-55纳米) 具有低分散度的瓶两,包装参数为~0.3.3.
- 对较不不对称的瓶刷表面活性剂的长圆柱状和非球状聚合物的观察.
- 测量了富含PEO的瓶刷两动物的1nM的临界细胞度,表明了增强的热力学稳定性.
结论:
- 巨型聚合物表面活性剂的持久分子形状决定了可预测和均的聚合物形成.
- 瓶表面活性剂的形状依赖组装允许在狭窄的形态窗口内合理制造各种微粒结构.
- 这些发现为设计和合成具有可控形态和稳定性的定制纳米材料提供了一条途径.
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