PVA/P(AA-AM)复合水凝胶的制备及性能

采用水溶液聚合方法合成了不同组成的丙烯酸-丙烯酰胺共聚物(P(AA-AM))。将聚乙烯醇(PVA)与所合成的P(AA-AM)共混,以戊二醛为交联剂,制备出了不同结构的PVA/P(AA-AM)复合水凝胶。采用扫描电镜观察了凝胶形貌,研究了复合水凝胶的结构与性能关系。结果表明,复合水凝胶溶胀性能与所用交联剂加量有关,复合水凝胶的溶胀度随着交联剂加量增加先增大后减小,在交联剂加量为0.5%时水凝胶溶胀度达到最大值。复合凝胶中的聚合物组成对溶胀度影响显著,随着P(AA-AM)含量提高,水凝胶的溶胀度逐渐增大。适当结构的复合水凝胶具有pH敏感性,敏感程度随着凝胶中P(AA-AM)含量的增加而增强。

Synthesis and Properties of PVA/P(AA-AM) Composite Hydrogel

P(AA-AM) copolymer based on acryl acid(AA) and acrylamide(AM) was synthesized by water solution polymerization with potassium peroxydisulfate and natrium sulfurosum as initiator,The PVA/P(AA-AM) composite hydrogel was prepared from aqueous solution containing PVA and P(AA-AM) by using glutaraldehyde as the crosslinker,the property and microcosmic structure of PVA/P(AA-AM) composite hydrogel was studied,The effects of crosslinker amount,P(AA-AM) content in PVA/P(AA-AM) hydrogels and pH on swelling ration were studied.The results show that the swelling ratio of hydrogels has the relationship with the crosslinker amount: the swelling ratio increases to the largest at 0.5% glutaraldehyde and then reduces with the crosslinker amount increasing.P(AA-AM) amount in PVA/ P(AA-AM) hydrogels has significant effect on the swelling ratio and pH sensitivity of hydrogels.The pH sensitivity of PVA/P(AA-AM) hydrogels increases with P(AA-AM) amount in the hydrogel.