Demonstrated is a new approach to cellulose fiber-based materials that are strong when wet, yet can be recycled after exposure to a weak reducing agent. Poly(N-isopropylacrylamide-co-acrylic acid) microgels were transformed into wet cellulose adhesives by incorporation of hydrazide groups that can form hydrazone linkages to oxidized cellulose. Reductant responsivity was obtained by introducing cleavable disulfide linkages, either in the chains tethering the adhesive hydrazide groups, or by using disulfide cross-links in the microgels. Both types of disulfide derivatives gave about 75% reduction in cellulose wet adhesion after exposure to a reductant. Truly sustainable wood-fiber replacements for plastic packaging must be insensitive to water while being fully recyclable; this work demonstrates two routes to reversible wet cellulose adhesives, facilitating recycling.

中文翻译：

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可降解的微凝胶湿强度胶粘剂：增强纸张回收能力的途径

展示了一种新的纤维素纤维基材料的方法，该材料在潮湿时会很牢固，但在暴露于弱还原剂后仍可以回收利用。聚（Ñ -isopropylacrylamide-共-丙烯酸）微凝胶通过掺入可以形成transformed键与氧化纤维素的酰肼基团而转变成湿纤维素粘合剂。还原剂的响应性是通过在可连接的酰肼基团的链中引入可裂解的二硫键，或在微凝胶中使用二硫键实现的。暴露于还原剂后，两种类型的二硫键衍生物均使纤维素湿粘合力降低了约75％。真正可持续发展的用于塑料包装的木纤维替代品必须对水不敏感，同时必须完全可回收。这项工作演示了两条可逆的湿纤维素胶粘剂路线，促进了回收利用。