Abstract Herein, self-healing multi-branched cellulose nanocrystals/polyvinyl alcohol (MCNC/PVA) composite films with excellent sensitivity to human motions was synthesized by employing MCNC as reinforcing agent, where the potassium chloride (KCl) was added to enhance the conductivity and strain sensitivity of the composite film. There was a synergistic effect between MCNC and PVA, which could promote the slip and recombination of hydrogen bonds, so that the films had robust strength (2.2 times to pure PVA) and high self-healing efficiency (69.54% after 20 min). Especially, the flexible composite film could clearly monitor both large and subtle human motions (finger bending, swallowing, breathing, and insect crawling), and showed larger subtle strain sensitivity (strains

中文翻译：

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具有增强多支化纤维素纳米晶体的超灵敏且坚固的自修复复合膜

摘要 在此，以 MCNC 为增强剂，添加氯化钾 (KCl) 以增强导电性，合成了对人体运动具有优异敏感性的自修复多支化纤维素纳米晶/聚乙烯醇 (MCNC/PVA) 复合薄膜。复合薄膜的应变敏感性。MCNC和PVA之间存在协同作用，可以促进氢键的滑移和复合，使薄膜具有强大的强度（是纯PVA的2.2倍）和高自愈效率（20分钟后69.54%）。特别是，柔性复合膜可以清楚地监测人体的大动作和细微动作（手指弯曲、吞咽、呼吸和昆虫爬行），并表现出更大的细微应变敏感性（应变