Dual-crosslinked starch/carboxymethyl cellulose blend film with ion-responsive dissolution properties
Dual-crosslinked starch/carboxymethyl cellulose blend film with ion-responsive dissolution properties
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DOI：
10.1016/j.polymdegradstab.2023.110453
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发表时间：
2023-09
影响因子：
5.9
通讯作者：
Yuxiang Jia;Yu-I. Hsu;H. Uyama
中科院分区：
文献类型：
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作者：
Yuxiang Jia;Yu-I. Hsu;H. Uyama
虽然淀粉塑料在水中迅速消失的能力使其成为解决目前由废弃一次性塑料造成的海洋塑料问题的潜在解决方案，但这种能力也转化为日常情况下缺乏耐水性。在这里，我们的目标是提高淀粉基共混膜在日常情况下的耐水性，同时通过引入离子交联剂使其在海洋环境中迅速分解和消失。通过改进的溶液浇铸法制备了双醛淀粉(DAS)/羧甲基纤维素(CMC)共混膜，在此过程中，DAS被阳离子试剂吉拉德试剂T逐渐阳离子化，并与CMC相互作用形成离子交联剂。同时，DAS上的缩醛基团还与DAS和CMC上的-OH基团形成缩醛键，进一步提高了材料的湿强度。在日常生活中遇到的低离子强度的溶液中，如淡水，薄膜对这两种类型的交联剂都保持稳定。在高离子强度的溶液中，如海水，由于离子交联键的断裂，薄膜迅速膨胀和解体。这项研究表明，离子交联可能成为平衡保护海洋生态系统和淀粉基共混膜易用性的潜在解决方案，这对未来海洋生态友好型一次性塑料的开发至关重要。
While the ability of quickly vanishing in water has made starch-based plastics a potential solution to the current marine plastic issue caused by discarded single-use plastics, this ability also translates into lack of water resistance in daily scenario. Here, we aim to improve the water resistance of starch-based blend films in daily scenarios while allowing them to disintegrate and vanish rapidly in marine environments via the introduction of ionic crosslinks. A dialdehyde starch (DAS)/carboxymethyl cellulose (CMC) blend film is prepared via a modified solution casting process, during which DAS is gradually rendered cationic by a cationizing reagent, Girard's reagent T, and interacts with CMC to form ionic crosslinks. Meanwhile, the aldehyde groups on DAS also form acetal bonds with the -OH groups on both DAS and CMC, which further increases the wet strength. In solutions of low ionic strength encountered in daily life, such as freshwater, the film remains stable for both types of crosslinks. In high-ionic-strength solutions, such as seawater, the film swells rapidly and disintegrates owing to the cleavage of ionic crosslinks. This study demonstrated ionic crosslink could be a potential solution for balancing the protection of marine ecosystem and ease of use of starch-based blend films, which is essential to the development of future marine ecosystem-friendly single-use plastics.