链内酮使能的环形交联聚乙烯

IF 5.2 Q1 POLYMER SCIENCE

ACS Macro Letters Pub Date : 2024-11-15 DOI:10.1021/acsmacrolett.4c0066010.1021/acsmacrolett.4c00660

Tobias O. Morgen, and , Stefan Mecking*,

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引用次数: 0

摘要

交联聚乙烯（PEs）被广泛使用，但链之间的永久链接阻碍了回收。我们发现，自由基（酮-低密度PE，酮- ldpe）和催化（酮-高密度PE，酮- hdpe）非交替乙烯- co共聚产生的酮功能化聚乙烯通过亚胺与二胺的形成，可以在熔体中有效地交联，形成的交联聚乙烯的凝胶组分高达85%，并改善了拉伸性能。材料中的亚胺基交联可以在140°C水解，以回收高达97%的初始热塑性酮-聚乙烯。低酮含量≤1.5 mol %被认为是理想的保持pe样的热性能，实现足够的交联密度，并保持循环可回收性。

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Circular Cross-Linked Polyethylene Enabled by In-Chain Ketones

Cross-linked polyethylenes (PEs) are widely employed, but the permanent links between the chains impede recycling. We show that via imine formation with diamines keto-functionalized polyethylenes from both free-radical (keto-low-density PE, keto-LDPE) and catalytic (keto-high-density PE, keto-HDPE) nonalternating ethylene-CO copolymerization can be cross-linked efficiently in the melt, resulting in gel fractions of the formed cross-linked PEs of up to 85% and improved tensile properties. The imine-based cross-links in the material can be hydrolyzed at 140 °C to recycle up to 97% of the initial thermoplastic keto-polyethylene. Low keto contents of ≤1.5 mol % are found ideal to retain PE-like thermal properties, achieve sufficient cross-link density, and maintain circular recyclability.

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来源期刊

ACS Macro Letters 化学-

CiteScore

10.40

自引率

3.40%

发文量

209

审稿时长

1 months

期刊介绍： ACS Macro Letters publishes research in all areas of contemporary soft matter science in which macromolecules play a key role, including nanotechnology, self-assembly, supramolecular chemistry, biomaterials, energy generation and storage, and renewable/sustainable materials. Submissions to ACS Macro Letters should justify clearly the rapid disclosure of the key elements of the study. The scope of the journal includes high-impact research of broad interest in all areas of polymer science and engineering, including cross-disciplinary research that interfaces with polymer science. With the launch of ACS Macro Letters, all Communications that were formerly published in Macromolecules and Biomacromolecules will be published as Letters in ACS Macro Letters.