磺化聚苯乙烯纳米微球-聚丙烯酰胺杂化水凝胶的制备及性能

Preparation and Properties of Sulfonated Polystyrene Nanospheres-Polyacrylamide Hybrid Hydrogels

首先通过乳液聚合法合成了聚苯乙烯(PS)微球,该微球经浓硫酸磺化后得到了磺化聚苯乙烯(SPS)微球;然后将合成的SPS微球作为多功能交联点加入丙稀酰胺(AAm)化学水凝胶网络中制备了SPS-PAAm杂化水凝胶。通过扫描电镜、透射电镜观察了SPS微球及杂化水凝胶的微观结构。研究了SPS微球对SPS-PAAm杂化水凝胶的凝胶分数、溶胀性能和力学性能的影响。结果显示:随着SPS微球用量的增加,SPS-PAAm水凝胶的凝胶分数先增加后降低,平衡溶胀度降低;SPS微球的加入能改善水凝胶的力学性能,随着SPS含量的增加,水凝胶的拉伸强度和能量损耗增加;SPS微球和PAAm分子链间存在物理相互作用。

Polystyrene（PS）microspheres were prepared by emulsion polymerization.PS microspheres were sulfonated by concentrated sulfuric acid to obtain sulfonated polystyrene（SPS）microspheres.SPS-PAAm hybrid hydrogels were prepared by adding synthetic SPS microspheres as a multifunctional crosslinking point to the polyacrylamide（PAAm）chemical hydrogel network.The microstructure of SPS microspheres and hybrid hydrogel were observed by scanning electron microscopy and transmission electron microscopy.The effects of SPS microspheres on the gel fraction,swelling properties and mechanical properties of hybrid hydrogels were studied.Results show that with the increase of SPS dosage,the SPS-PAAm gel fraction increases first and then decreases,and the equilibrium swelling degree of SPS-PAAm hydrogel decreases.In addition,the addition of SPS microspheres can improve the mechanical properties of hydrogels.The tensile strength and the energy loss of hydrogel increase with the increase of SPS dosage,and there is physical interaction between SPS microspheres and PAAm molecular chains.