在分子结构的分支增强可溶性在CO2
Kazuya Kobayashi1,2, Abbas Firoozabadi2
1Technical Division, INPEX Corporation, Minato-ku, Tokyo 107-6332, Japan.
PNAS nexus
|November 29, 2023
概括
在碳化合物寡合物中分支显著提高了在二氧化碳 (CO2) 中的溶解性. 分子结构的修改,特别是添加甲基,改善了CO2耐溶性,提高了可溶性高达270倍.
科学领域:
- 物理化学 物理化学
- 计算化学计算化学
- 聚合物科学 聚合物科学
背景情况:
- 高分子量化合物在二氧化碳 (CO2) 中溶解性较差,限制了其作为溶剂的使用.
- 用添加剂修改CO2特性是一种常见的方法,但改变溶液特性提供了一个替代方案.
研究的目的:
- 研究分子结构如何影响碳化合物寡合体在二氧化碳中的可溶性.
- 开发和利用一个粗粒度分子模型来预测溶解度.
主要方法:
- 开发了碳化合物寡合物的粗粒度分子模型.
- 使用粒子群优化优化优化模型以匹配实验性质 (密度,表面张力,蒸发度).
- 在CO2中模拟各种寡合物的可溶性.
主要成果:
- 与类似分子量线性基相比,寡合体分支显著增加了在CO2中的可溶性,高达270倍.
- 结构"边缘"的数量 (例如,甲基) 与增强的二氧化碳性相关.
- 一个分支较多的寡合物 (九个单元的聚-1-二甲烯) 显示出比一个分支较少的寡合物 (六个单元的聚-1-二甲烯) 更高的溶解度,尽管分子重量更高.
结论:
- 改变分子结构,特别是增加分支,是提高高分子量化合物的可溶性在CO2中的有效策略.
- 这种方法提供了一种改善二氧化碳的方法,而不会改变溶液的化学成分.
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