期刊
CARBOHYDRATE POLYMERS
卷 256, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.117580
关键词
Hydrogel; Self-healing; Hydrogen bond; Semi-IPN
资金
- Startup Foundation of China [3160011181808]
A novel method was developed to prepare a semi-interpenetrating polymer network (semi-IPN) hydrogel with improved properties, based on sodium alginate (SA) and polyacrylamide (PAM). The formation mechanism of a layered structure through hydrogen bonds (HBs) and the key role of HBs in enhancing self-healing of the hydrogel were systematically characterized. The semi-IPN structure resulted in a high tensile strength of 266 kPa and broadened the functionality and variety of hydrogels.
Hydrogels are widely used in many fields but generally suffer from low mechanical strength and poor self-healing performance. Here, a novel and facile method was developed to prepare a semi-interpenetrating polymer network (semi-IPN) hydrogel with layered structure and improved properties based on sodium alginate (SA) and polyacrylamide (PAM). Systematic characterizations revealed a formation mechanism of layered structure via hydrogen bonds (HBs) promoted self-assembly of SA in the porous PAM matrix. Also, HBs can also display a key role in enhancing self-healing of the hydrogel, by which the hydrogel possesses a self-healing capacity of 99 % with sprayed by a few of water. Moreover, the layered semi-IPN structure makes the tensile strength of PAMSA hydrogel reach 266 kPa. The fabricated PAMSA hydrogel with layered microstructure containing SA provides a protocol to broaden the functionality and variety of the hydrogels.
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