Preparation And Antifouling Properties Of The Modified Polyvinyl Alcohol Hydrogel

Hydrogel is a kind of three-dimensional network structure with new functional polymer materials, which could swell and insoluble in water and keep a large amount of water.Because hydrogel has the ability to swell quickly, absorb large quantities of water, high elasticity, soft and good biocompatibility, it was widely applied in various fields. However,the mechanical strength and stability of hydrogel were poor, which limited the application of hydrogel materials. Hence, in this thesis, aiming at the poor mechanical properties of hydrogel,some research work had been done taking ship protection coating as background, it was prepared physically crosslinked modified polyvinyl alcohol (PVA) hydrogel with phyllosilicate clay (Bentonite, Kaolin,Mica) and agarose (AG) by freezing-thawing method.We explored the effects of different amounts of clay and the ratio of AG and PVA on the microstructure, swelling properties and compression performance of composite hydrogel. We also studied the antifouling performance of composite hydrogel by means of laboratory evaluation, including protein-resistant experiments and testing the marine microalgae adhesion amount.Clay and agarose modified PVA hydrogel were still able to maintain the full three-dimensional network structure of after swelling by SEM analysis. When the clay content was 2.0% in the clay-modified hydrogel, the content ratio of the PVA and AG is 10:0.5 in the AG-modified hydrogel, the grid structure of the system was relatively uniform, while the pore size was about 1 ?m.After swelling properties and compression performance analysis, the swelling properties of the clay-modified hydrogel was reduced with clay content increasing in the system, and the higher content of the clay was not conducive to the swelling behavior of composite hydrogel;the higher content of the clay, the better mechanical properties of the system, and the mica-modified hydrogel had the maximum compressive stress in the same compressive strain;the swelling properties of AG-modified hydrogel is significantly higher than the single hydrogel system, and the mechanical properties increased of with the PVA content increased.It exhibited high resistance to the attachment of bovine serum albumin by protein-resistant experiments, while the content of clay in the clay-modified PVA hydrogel was 2.0%. Moreover, the mica-modified composite hydrogel was the best; When the content ratio of AG and PVA was 3:1,the AG-modified composite hydrogel had the best protein-resistant properties.The anti-adhesion properties of diatom of clay-modified PVA hydrogel decreased with clay content increasing. And when the clay content in the system was less than 2.0%, the amount of diatom attached was the least; while AG and PVA was 1:1, the AG-modified PVA hydrogel had the best antifouling performance.