聚合物和表面活性剂的疏水和静电相互作用的平衡:阳离子表面活性剂和疏水改性聚合物的情况
Egor A Bersenev1, Lauren Matthews2, Valentina Rein2
1European Synchrotron Radiation Facility (ESRF), 71 avenue des Martyrs, Grenoble, 38000, France; School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, United Kingdom.
Journal of colloid and interface science
|April 23, 2025
概括
这项研究揭示了聚合物表面活性剂聚合物如何随着pH而改变结构. 疏水性修饰的聚 ((乙烯基-罗利) 和二甲基硫酸盐形成由疏水性或静电相互作用驱动的网络.
科学领域:
- 聚合物科学 聚合物科学
- 超分子化学 超分子化学
- 材料科学 材料科学 材料科学
背景情况:
- 聚合物-表面活性剂相互作用对于设计功能性材料至关重要.
- 了解聚合物结构和pH依赖性行为是控制自组装的关键.
- 防水改性聚合物为聚合物形成提供了独特的特性.
研究的目的:
- 研究不同pH条件下的聚合物表面活性剂聚合物的结构演变.
- 阐明水和静电相互作用在聚合物形成中的作用.
- 描述由疏水性修饰的聚乙烯 (Vinyl-pyrrolidone) 和二甲基硫酸盐组成的网络结构.
主要方法:
- 用小角度X射线散射 (SAXS) 来研究聚合物结构.
- 数据分析是在绝对强度尺度上进行的,具有分子参数约束.
- 在弱 (pH9) 和强 (pH2) 相互作用模式下形成的聚合物的比较分析.
主要成果:
- 在pH值为9时,在低度的表面活性剂中形成长长的聚合物,在过度度时转变为紧的状结构.
- 聚合物-表面活性剂聚合物形成了一个连续的网络,聚合物作为一个交叉连接器.
- 在弱相互作用 (pH9) 和强相互作用 (pH2) 方案之间观察到不同的聚合结构.
结论:
- pH值显著影响聚合物表面活性剂聚合物的自我组装和结构特征.
- 疏水性相互作用驱动在中性/性pH下复杂网络的形成.
- 静电吸引导致酸性pH下沉物形成,与网络结构形成鲜明对比.
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