通过聚合诱导的自我组装在缩溶液中合理合成低聚合分散度块共聚合物囊泡
Carlo Gonzato1, Mona Semsarilar, Elizabeth R Jones
1Department of Chemistry, The University of Sheffield , Brook Hill, Sheffield, S3 7HF, United Kingdom.
Journal of the American Chemical Society
|July 16, 2014
概括
我们开发了一种新方法,使用聚合诱导的自我组装来创建统一的块共聚合物囊泡. 这种技术可以在缩溶液中精确控制囊泡大小,克服传统方法的局限性.
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:
- 块共聚合物自组装通常需要高稀释,从而导致聚合物体的大小分布.
- 这种广泛的尺寸分布限制了聚合体的潜在应用.
研究的目的:
- 开发一种方法,在缩溶液中合成低多分散度的双块共聚合物囊泡.
- 为了利用聚合诱导的自我组装 (PISA) 来控制囊泡的形成.
主要方法:
- 甲酸的可逆添加-碎片化链转移 (RAFT) 聚合.
- 使用不同长度的聚甲酸稳定剂块的二元混合物.
- 动态光散射 (DLS) 用于阶段图构造.
- 用于结构分析的小角度X射线散射 (SAXS).
主要成果:
- 在缩溶液中实现了低多聚分散度的双块共聚合物囊泡的合成.
- 证明稳定剂块的二进制混合物与单个稳定剂块相比,产生更窄的尺寸分布.
- 萨克斯和自相一致的平均场理论 (SCMFT) 证实了囊泡结构和更窄的尺寸分布.
- 确定了聚甲酸膜的显著溶剂可塑化.
结论:
- 在RAFT聚合中使用二元混合策略,可实现统一聚合物的受控合成.
- 这种PISA方法比用于囊泡生产的传统后聚合方法具有优势.
- 这些发现提供了对聚合体形成和膜性质的洞察.
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