从不对称的晶体线圈聚合物 (ferrocenylsilane-siloxane) 块共聚合物的自组装中产生的纳米管
Jose Raez1, Ian Manners, Mitchell A Winnik
1Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada.
Journal of the American Chemical Society
|August 29, 2002
概括
聚 ((ferrocenyldimethylsilane-b-dimethylsiloxane) 阻断共聚物形成独特的纳米管. 这些结构具有结晶的聚铁二甲外和空心,长度可达0.1毫米.
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:
- 区块共聚合物通常在选择性溶剂中形成球形.
- 区块共聚合物的高不对称性通常会导致类似恒星的微粒结构.
- 了解区块共聚合物的自我组装是设计新型纳米材料的关键.
研究的目的:
- 调查聚铁二甲基-b-二甲基) (PFS-b-PDMS) 块共聚合物的自组装行为.
- 探索从这些块共聚合物中形成非球形纳米结构,特别是纳米管的形成.
- 描述所产生的纳米管的形态,形成机制和可调节性质.
主要方法:
- 通过序列离子聚合合成PFS-b-PDMS阻断共聚合物的合成.
- 使用常规传输电子显微镜 (TEM) 和暗场扫描传输电子显微镜 (STEM) 进行自我组装纳米结构的表征.
- 通过时间和温度依赖性研究分析结构演变,并使用能量分散式X射线 (EDX) 光谱学确认空心.
主要成果:
- 具有高不对称性 (1:12比) 的PFS-b-PDMS阻塞共聚合物在PFS (n-hexane, n-decane) 较差的溶剂中自组装成纳米管.
- 这些纳米管具有结晶的PFS核心,形成外和PDMS冠状,具有明显的中空腔.
- 观察到形态转变,各种初始结构最终重新排列成稳定的纳米管,长度 (高达0.1毫米) 可通过时间和溶剂选择控制.
结论:
- 在PFS-b-PDMS块共聚合物中的高不对称性推动了独特的纳米管状结构的形成,与典型的球形菌粒不同.
- 自组装过程涉及PFS块的结晶,形成一个围绕空心的坚固外.
- 这些纳米管代表了一种新的纳米材料类别,具有可调节的尺寸和在封装和受控释放中的潜在应用.
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