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区块共聚合物分子设计,以解决回收聚烯混合物的实际限制

Shuquan Cui¹, Daun Jeong², Yukai Shi²

¹Department of Chemistry, University of Minnesota, Minneapolis, MN 55455.

Proceedings of the National Academy of Sciences of the United States of America

|July 18, 2025

概括

这项研究开发了一种修改的triblock共聚合物 (EXE),以提高回收聚乙烯 (PE) 和异性聚烯 (iPP) 混合物的性. 新的共聚物增强了机械性能,使成本效益高的塑料回收利用成为可能.

科学领域:

聚合物科学聚合物科学
材料科学材料科学材料科学
可持续化学可持续化学

背景情况:

聚乙烯 (PE) 和异性聚烯 (iPP) 是主要的塑料污染物.
通过融混合来回收PE和iPP,由于相位分离导致产生的材料的机械性能差,因此受到阻碍.
现有的回收方法难以有效地分离聚烯,导致具有较差界面强度的脆性产品.

研究的目的:

开发一种改进的triblock共聚合物 (EXE),增强回收PE和iPP混合物的性.
为了克服与以前的EXE配方低温溶剂不溶性相关的工业化挑战.
通过现有工业设施,提供一个具有成本效益的回收PE和iPP的战略.

主要方法:

通过阳离子聚合和溶液化合成的聚乙烯 (乙烯) 块聚乙烯 (乙烯) 块聚乙烯 (乙烯) (EXE) 三块共聚合物.
在EXE共聚合物的E块中变化了乙烯分支含量 (EB) (1.5 ≤ EB ≤ 6.5).
评估了PE/iPP混合物中改性EXE共聚物质的机械性能 (抗拉性,破裂时应变) 和溶解性.

主要成果:

在回收PE/iPP混合物中,使用1.5 ≤ EB ≤ 6.5.5的改性EXE共聚合物实现了可比性 (>400%的破裂应变).
降低了EXE结晶性,并在室温下改善了在环素中的溶解性,EB含量增加.
证明了硬化源于E块纠/结晶性和iPP/PE矩阵之间的协同相互作用,防止相位分离和提高界面强度.

结论:

经过修改的EXEtriblock共聚合物具有受控的乙烯分支,可以有效地使回收PE和iPP混合物变硬.
减少晶度和提高EXE共聚物溶解度,促进了工业规模的生产和应用.
这种方法提供了一种可行且具有成本效益的解决方案,用于回收混合聚烯废物流,解决塑料污染问题.

关键词:

区块共聚物的区块共聚物.兼容性兼容性兼容性兼容性聚烯的多种类型回收回收是回收的方法.

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