Effects of the Amylose/Amylopectin Ratio of Starch on Borax-Crosslinked Hydrogels

被引:3
|
作者
Lu, Kai [1 ,2 ]
Folkersma, Rudy [2 ]
Voet, Vincent S. D. [2 ]
Loos, Katja [1 ]
机构
[1] Univ Groningen, Zernike Inst Adv Mat, Macromol Chem & New Polymer Mat, Nijenborgh 4, NL-9747 AG Groningen, Netherlands
[2] NHL Stenden Univ Appl Sci, Circular Plast Acad Technol & Innovat, Schaikweg 94, NL-7811 KL Emmen, Netherlands
关键词
starch; amylose/amylopectin; hydrogel; borax; dynamic borate ester bonds; INCLUSION COMPLEX-FORMATION; RHEOLOGICAL PROPERTIES; POLY(VINYL ALCOHOL); ACID; LYSOPHOSPHATIDYLCHOLINE; MICROSTRUCTURE; CELLULOSE; GELATION;
D O I
10.3390/polym16162237
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Herein, we simultaneously prepared borax-crosslinked starch-based hydrogels with enhanced mechanical properties and self-healing ability via a simple one-pot method. The focus of this work is to study the effects of the amylose/amylopectin ratio of starch on the grafting reactions and the performance of the resulting borax-crosslinked hydrogels. An increase in the amylose/ amylopectin ratio increased the gel fraction and grafting ratio but decreased the swelling ratio and pore diameter. Compared with hydrogels prepared from low-amylose starches, hydrogels prepared from high-amylose starches showed pronouncedly increased network strength, and the maximum storage modulus increased by 8.54 times because unbranched amylose offered more hydroxyl groups to form dynamic borate ester bonds with borate ions and intermolecular hydrogen bonds, leading to an enhanced crosslink density. In addition, all the hydrogels exhibited a uniformly interconnected network structure. Furthermore, owing to the dynamic borate ester bonds and hydrogen bonds, the hydrogel exhibited excellent recovery behavior under continuous step strain, and it also showed thermal responsiveness.
引用
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页数:15
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