Photoinduced Redox Initiation System for Delayed-Onset Radical UV-Curable Adhesives on Opaque Substrates

IF 4.9 Q1 POLYMER SCIENCE

ACS Macro Letters Pub Date : 2026-10-20 Epub Date: 2026-09-28 DOI:10.1021/acsmacrolett.6c00416

Naoya Machida, Ataru Daimon, Daisuke Aoki, Koji Arimitsu

{"title":"Photoinduced Redox Initiation System for Delayed-Onset Radical UV-Curable Adhesives on Opaque Substrates","authors":"Naoya Machida, Ataru Daimon, Daisuke Aoki, Koji Arimitsu","doi":"10.1021/acsmacrolett.6c00416","DOIUrl":null,"url":null,"abstract":"<p>Conventional radical\r\nultraviolet (UV) curing requires optically\r\ntransparent substrates owing to the rapid termination of propagating\r\nradicals, limiting its use in opaque or geometrically complex assembly\r\ncases. We report a photoinduced redox initiation system for delayed-onset\r\nradical UV-curable adhesives combining a coumarin-based photobase\r\ngenerator (Cou-TMG) with dilauroyl peroxide (LP). Upon UV irradiation,\r\nCou-TMG releases 1,1,3,3-tetramethylguanidine, which reacts with LP\r\nthrough a redox process that continuously generates radicals, sustaining\r\npolymerization after irradiation stops. Optimized photobase generator\r\nloading and irradiation dose provide an open time sufficient for substrate\r\nlamination (low C═C conversion immediately after UV irradiation)\r\nand endow substantial postpolymerization capability (higher C═C\r\nconversion after 1 h), contrasting conventional radical UV curing\r\nsystems. The delayed-onset, radical UV-curable adhesives are applicable\r\nto various multifunctional acrylates. Specifically, trimethylolpropane\r\ntriacrylate-based adhesives achieve a high lap-shear strength of 4.4\r\nMPa on aluminum, and the present system further bonds Cu, Fe, polycarbonate,\r\nand glass substrates.</p>","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":"15 10","pages":"1532–1537"},"PeriodicalIF":4.9000,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Macro Letters","FirstCategoryId":"92","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsmacrolett.6c00416","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2026/9/28 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}

引用次数: 0

Abstract

Conventional radical ultraviolet (UV) curing requires optically transparent substrates owing to the rapid termination of propagating radicals, limiting its use in opaque or geometrically complex assembly cases. We report a photoinduced redox initiation system for delayed-onset radical UV-curable adhesives combining a coumarin-based photobase generator (Cou-TMG) with dilauroyl peroxide (LP). Upon UV irradiation, Cou-TMG releases 1,1,3,3-tetramethylguanidine, which reacts with LP through a redox process that continuously generates radicals, sustaining polymerization after irradiation stops. Optimized photobase generator loading and irradiation dose provide an open time sufficient for substrate lamination (low C═C conversion immediately after UV irradiation) and endow substantial postpolymerization capability (higher C═C conversion after 1 h), contrasting conventional radical UV curing systems. The delayed-onset, radical UV-curable adhesives are applicable to various multifunctional acrylates. Specifically, trimethylolpropane triacrylate-based adhesives achieve a high lap-shear strength of 4.4 MPa on aluminum, and the present system further bonds Cu, Fe, polycarbonate, and glass substrates.

查看原文本刊更多论文

不透明基材上医用延迟上光固化胶粘剂的光诱导氧化还原引发体系

传统的自由基紫外线（UV）固化需要光学透明的基材，由于传播自由基的快速终止，限制了它在不透明或几何复杂的装配情况下的使用。我们报道了一种结合香豆素基光碱生成剂（cu - tmg）和过氧化二氯脲（LP）的延迟起效自由基紫外光固化胶粘剂的光诱导氧化还原引发系统。在紫外线照射下，cu - tmg释放1,1,3,3-四甲基胍，与LP发生氧化还原反应，不断产生自由基，在照射停止后保持聚合。与传统的自由基UV固化系统相比，优化的光碱发生器负载和辐照剂量提供了足够的基材层合开放时间（紫外线照射后立即降低C = C转化率），并赋予了大量的后聚合能力（1小时后更高的C = C转化率）。迟发性自由基型紫外光固化胶粘剂适用于各种多功能丙烯酸酯。具体来说，基于三甲基丙烷三丙烯酸酯的粘合剂在铝上实现了4.4 MPa的高剪切强度，并且该系统进一步粘合Cu， Fe，聚碳酸酯和玻璃基板。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.