| EG 改性 PVA/PAM 双网络水凝胶的抗冻保湿性能及在草莓保鲜中的应用 |
| 点此下载全文 |
| 引用本文：姚雨,李海凤,张燕,王继芬,王星懿,钟健.EG 改性 PVA/PAM 双网络水凝胶的抗冻保湿性能及在草莓保鲜中的应用[J].上海第二工业大学(中文版),2026,43(1):1-8 |
| 摘要点击次数: 469 |
| 全文下载次数: 65 |
|
| 基金项目:国家自然科学基金(51776116, 52176081)，上海市科技项目(22010500600)，上海市扬帆计划(19YF1416500)资助 |
|
| 中文摘要:水凝胶是亲水性高分子三维网络材料，其高保湿性与柔软性使其在农业低温场景中具有潜在应用价值，但传统聚乙烯醇/聚丙烯酰胺(polyvinyl alcohol/acrylamide, PVA/PAM)双网络水凝胶易低温冻结、保湿失效。本研究引入乙二醇(ethylene glycol, EG)改性，以过硫酸胺(ammonium persulfate, APS)为引发剂、N,N'-亚甲基双丙烯酰胺(N,N′-methylene diacrylamide, MBA)为交联促进剂，经冷冻循环法制备抗冻保湿水凝胶。结构表征显示，材料形成致密微孔结构，双网络协同作用使其拉伸应变达540%~550%；EG通过氢键束缚自由水、抑制冰晶，显著提升抗冻保湿性。其在上海冬季(0~5 ℃、65%湿度)与早春(10~15 ℃、60%湿度)环境中，30 d保湿率分别可达72.33%与60.91%。草莓保鲜实验证实，水凝胶薄膜10 d腐烂率低，且EG迁移量符合安全标准，为农业低温保护、食品保鲜提供可行方案。 |
| 中文关键词:抗冻保湿 双网络水凝胶 乙二醇 |
| |
| Anti-Freezing and Moisturizing Properties of EG-Modified PVA/PAM Double Network Hydrogel and Its Application in Strawberry Preservation |
|
|
| Abstract:Hydrogels are three-dimensional network materials composed of hydrophilic polymers. Their high moisture retention and softness make them potentially valuable in agricultural low-temperature scenarios. However, traditional polyvinyl alcohol/acrylamide (PVA/PAM) double network hydrogels are prone to freezing and losing their moisture retention at low temperatures. In this study, ethylene glycol (EG) was introduced for modification, and ammonium persulfate (APS) was used as the initiator and N,N′-methylene diacrylamide (MBA) as the crosslinking accelerator to prepare antifreeze and moisture-retaining hydrogels through a freeze-thaw cycle method. Structural characterization reveals that the material forms a dense micro-porous structure, and the double network synergy enables a tensile strain of 540%~550%. EG binds free water through hydrogen bonds and inhibits ice crystal formation, significantly enhancing the antifreeze and moisture retention properties. In Shanghai’s winter (0~5 ℃, 65% humidity) and early spring (10~15 ℃, 60% humidity), the 30-day moisture retention rate are 72.33% and 60.91%, respectively. The strawberry preservation experiment confirms that the hydrogel film has a low spoilage rate after 10 days, and the EG migration amount meets safety standards, providing a feasible solution for agricultural low-temperature protection and food preservation. |
| keywords:anti-Freezing and moisturizing double network hydrogel ethylene glycol |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|