Noncovalent Cross-Linking of Diketopyrrolopyrrole Polymer via Polyvinyl Chloride for Intrinsically Stretchable Organic Field-Effect Transistors

作者：Hao Wang, Chengyi Xiao, Haonan Geng, Ying Liu, Jianing Xu, Ziheng Lu, Haiyun Fan, Yonggang Zhen, Weiwei Li · 发表于：Macromolecules · 年份：2025 · DOI：10.1021/acs.macromol.5c01817 · 被引用次数：6 · 研究领域：Organic Electronics and Photovoltaics、Conducting polymers and applications、Organic Light-Emitting Diodes Research

The physical blending of insulating polymers into conjugated polymer matrices has emerged as an effective strategy to improve mechanical properties in flexible electronics through enhanced tie-chain density and noncovalent cross-linking network formation. In this study, we demonstrate polyvinyl chloride (PVC) as an effective tie-chain promoter for diketopyrrolopyrrole (DPP)-thiophene copolymers (DPP-T) through C–H···S hydrogen bonding and C–Cl···C═O dipole–dipole force. The PVC/DPP-T blend simultaneously enhances mechanical properties (crack-onset strain: 40.3% to 80.2%; elastic modulus: 120 to 80 MPa) while maintaining charge transport performance (hole mobility: 0.03–0.06 cm 2 V –1 s –1 ) in stretchable organic field-effect transistors under 100% strain. This physical blending approach creates a noncovalent cross-linking network that improves electromechanical stability without complex synthetic modification, offering a practical solution to the intrinsic mobility-stretchability trade-off in conjugated polymers.