盐对POCB-水混合物的相位行为和共结晶动力学的影响
Michael Gresh-Sill1, Sudesna Banerjee1, Tara Y Meyer2
1Department of Chemical Engineering, University of Pittsburgh, 940 Benedum Hall, Pittsburgh 15261, Pennsylvania, USA.
Langmuir : the ACS journal of surfaces and colloids
|February 2, 2024
概括
将 NaCl 盐添加到多氧化和水混合物中,可以扩大液体-液体平衡,降低水合物的点. 在和盐溶液中,POCB-水合物保持稳定,尽管盐会减缓结晶动力学.
科学领域:
- 聚合物科学 聚合物科学
- 物理化学 物理化学
- 材料科学是一种材料科学.
背景情况:
- 聚氧基 (POCB) - 水混合物表现出独特的相位行为,包括液-液平衡 (LLE) 和罕见的聚合物-水合物共结晶.
- 了解添加剂对这些相变的影响对于潜在的应用至关重要.
研究的目的:
- 为了研究NaCl盐对POCB-水混合物的相图和水合物结晶动力学的影响.
- 为了评估POCB-水合物的稳定性和特性,在存在不同的盐度.
主要方法:
- 具有不同NaCl度的POCB-水混合物的相位行为分析.
- 差分扫描热度计 (DSC) 用于确定水合物化温度.
- 动力学研究观察水合物结晶的速度.
主要成果:
- 较低的盐度 (<0.1 wt %) 显著扩大了LLE区域.
- 高度的盐 (~10重量%) 降低了水合物化温度低于37°C.
- POCB-水合物表现出显著的盐分耐受性,在盐和溶液中在室温下持久.
- 盐添加减缓了水合物结晶动力学,远远超过仅仅通过点压缩来预测的速度.
结论:
- NaCl盐调节POCB水系统的相位行为,扩大LLE并降低水合物点.
- 在高盐度条件下,POCB-水合物是稳定的,这表明在盐水环境中应用的潜力.
- 盐对水合物结晶动力学产生影响,表明了超出简单热力学效应的复杂相互作用.
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