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聚乙烯的乳液聚合变为聚乙烯纳米粒子,以自乳化纳米滴作为核

Longhua Peng¹, Min Wu¹, Jiahan Lu¹

¹Research Center for Water Resources and Interface Science, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China.

Langmuir : the ACS journal of surfaces and colloids

|January 17, 2025

概括

这项研究表明,自乳化纳米滴是通过乳液聚合形成聚乙烯纳米粒子 (PSNP) 的关键核化地点. 了解这种机制可以控制PSNP大小和形状的调节.

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:

乳液聚合制造聚乙烯纳米颗粒 (PSNP) 的机制尚未完全理解.
现有的知识缺乏预混合物半结构和最终PSNP属性之间的明确联系.

研究的目的:

阐明PSNP在乳液聚合过程中的形成机制.
研究自我乳化纳米滴 (SEND) 在PSNP核化中的作用.
确定反应参数,预混合物中位结构和PSNP特征之间的相关性.

主要方法:

在不同的表面活性剂度,单体含量,温度和平衡时间下研究了烯的乳液聚合.
在不同的反应条件下分析了PSNP的形成和形态.
利用模型系统的冷却来观察中间结构并确认核化地点.

主要成果:

确定了自乳化油纳米滴 (100-300nm) 作为在高温和低表面活性剂度下形成的关键核化部位.
证明了寡合基在油水界面上被捕获,并在油滴中传播.
当系统早期冷却时观察到空心聚烯球体的形成,破裂的PSNP和 dandelion-like PSNP,确认油滴是初级形成地点.

结论:

PSNP的形成主要由自乳化油纳米滴中的核形成控制.
反应条件显著影响预混合物的半结构,决定PSNP的特性.
这项研究为精确控制PSNP单分散性和形态学提供了一条途径.

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