Rational Design of Functional Bottlebrush Polymers for Polylactide Blends with Improved Toughness and Antibacterial Performance

IF 4.9 Q1 POLYMER SCIENCE

ACS Macro Letters Pub Date : 2026-08-18 Epub Date: 2026-08-05 DOI:10.1021/acsmacrolett.6c00274

Jae Jun Kim, Hyojin Jung, Yejin Kim, So Youn Kim, Jong-Chan Lee

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Abstract

A series of bottlebrush polymers was rationally synthesized using norbornene-functionalized polylactide (NB-PLA), polycaprolactone (NB-PCL), and quaternized poly(2-(dimethylamino)ethyl methacrylate (NB-QPDM) via ring-opening metathesis polymerization (ROMP). These polymeric additives enabled the simultaneous improvement of toughness and antibacterial activity in PLA blends. Incorporating 10 wt % of P34, which consists of NB-PLA, NB-PCL, and NB-QPDM with backbone degrees of polymerization of 6, 34, and 4, respectively, led to a significant increase in tensile toughness while maintaining the tensile strength and Young’s modulus comparable to neat PLA. This enhancement could be ascribed to the combined effects of a dispersed toughening phase and a weak physical network structure. Furthermore, the PLA blend containing P34 exhibited outstanding antibacterial efficacy of 99.5% against E. coli, which originated from the presence of a quaternary ammonium group.

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提高韧性和抗菌性能的聚乳酸共混物功能性瓶刷聚合物的合理设计

以降冰片烯功能化聚乳酸（NB-PLA）、聚己内酯（NB-PCL）和季铵盐化聚(2-（二甲氨基）甲基丙烯酸乙酯（NB-QPDM）为原料，通过开环复分解聚合（ROMP）合理合成了一系列瓶刷聚合物。这些聚合物添加剂能够同时改善PLA共混物的韧性和抗菌活性。P34由NB-PLA、NB-PCL和NB-QPDM组成，主聚合度分别为6、34和4，加入10 wt %的P34，可以显著提高拉伸韧性，同时保持拉伸强度和杨氏模量与纯PLA相当。这种增强可以归因于分散的增韧相和弱物理网络结构的共同作用。此外，含有P34的PLA共混物对大肠杆菌的抑菌率为99.5%，这主要是因为P34的季铵基团的存在。

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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.