期刊
DESIGNED MONOMERS AND POLYMERS
卷 20, 期 -, 页码 505-513出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/15685551.2017.1382433
关键词
Hydrogel; cross-linking; borax; polyvinylalcohol; polyvinylpyrrolidone
资金
- National Natural Science Foundation of China [51673131]
- Project of Science and Technology Department of Sichuan Province [2016FZ0081]
- Provincial Academic and Technical Leaders Foundation of Sichuan Province [2016-183-29]
A dual network hydrogel made up of polyvinylalcohol (PVA) crosslinked by borax and polyvinylpyrrolidone (PVP) was prepared by means of freezing-thawing circles. Here PVP was incorporated by linking with PVA to form a network structure, while the introduction of borax played the role of crosslinking PVA chains to accelerate the formation of a dual network structure in PVA/PVP composite hydrogel, thus endowing the hydrogel with high mechanical properties. The effects of both PVP and borax on the hydrogels were evaluated by comparing the two systems of PVA/PVP/borax and PVA/borax hydrogels. In the former system, adding 4.0% PVP not only increased the water content and the storage modulus but also enhanced the mechanical strength of the final hydrogel. But an overdose of PVP just as more than 4.0% tended to undermine the structure of hydrogels, and thus deteriorated hydrogels' properties because of the weakened secondary interaction between PVP and PVA. Likewise, increasing borax could promote the gel crosslinking degree, thus making gels show a decrease in water content and swelling ratio, meanwhile shrinking the pores inside the hydrogels and finally enhancing the mechanical strength of hydrogels prominently. The developed hydrogel with high performances holds great potential for applications in biomedical and industrial fields.
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