Preparation and Mechanical Properties of Hydroxyl Boron Nitride Nanosheets/Sodium Alginate/Polyacrylamide Hydrogels
Boron nitride nanosheets(BNNSs)have unique structure and superior physical properties,so they are ideal nano fillers.Hydroxyl functionalized boron nitride nanosheets(OH-BNNSs)were modified on the surface of boron nitride nanosheets by ball milling to im-prove the hydrophilicity of the boron nitride nanosheets.Then,the composite nano-sized hy-droxy boron nitride/sodium alginate/polyacrylamide(m(SA)∶m(PAM)=1∶2,2.0%(mass concentration)OH-BNNSs)composite hydrogel(OH-BNNSs/SA/PAM)was pre-pared.SEM and FT-IR results showed that hydrogen bonds were formed between the amino groups on the molecular chains of polyacrylamide and the hydroxyl groups on functional bo-ron nitride,resulting in the formation of new crosslinking points.Sodium alginate was crosslinked with calcium ions and free radical polymerization with acrylamide.Therefore,af-ter adding OH-BNNSs and introducing new crosslinking network,the crosslinking density of three component composite hydrogel increased significantly.Static mechanical tensile tests showed that the OH-BNNSs/SA/PAM three component composite hydrogel had higher ten-sile strength and modulus compared with pure PAM hydrogel.At the same time,TGA and DTG showed that the maximum degradation temperature increased,and the equilibrium swelling degree decreased by differential weight method.
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