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首页> 外文期刊>Advanced functional materials >Designing a Length-Modulated Azide Photocrosslinker to Improve the Stretchability of Semiconducting Polymers
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Designing a Length-Modulated Azide Photocrosslinker to Improve the Stretchability of Semiconducting Polymers

机译：Designing a Length-Modulated Azide Photocrosslinker to Improve the Stretchability of Semiconducting Polymers

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摘要

To impart high stretchability to semiconducting polymers, researchers haveused a photocrosslinking approach based on the nitrene chemistry of anazide-incorporated molecular additive. However, understanding of the moleculardesign of azide crosslinkers with respect to their effects on the electricaland mechanical properties of semiconducting polymer thin films is lacking.In this study, the effects of an azide photocrosslinker’s molecular length andstructure on the microstructural, electrical features, and stretchability ofphotocrosslinked conjugated polymer films is investigated. For a systematiccomparison, a series of nitrene-induced photocrosslinkers (n-NIPSs) with differentnumbers of ethylene glycol repeating units (n = 1, 4, 8, 13) that bridgetwo tetrafluoro-aryl azide end groups is synthesized. Two semicrystallineconjugated polymers and two nearly amorphous conjugated polymers areco-processed with n-NIPSs and crosslinked by brief exposure to UV light. It isfound that, among the synthesized n-NIPSs, the shortest one (1-NIPS) is themost efficient in improving the stretchability of crosslinked indacenodithiophene-benzothiadiazole films and that the improvement is achieved only withnearly amorphous polymers, not with semicrystalline conjugated polymers.On the basis of systematic studies, it is suggested that crosslinking density inamorphous regions is important in improving thin film stretchability.

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