以N-异丙基丙烯酰胺（NIPAm）为单体，聚乙二醇（PEG）为致孔剂，聚甲基丙烯酸-β-羟乙酯（PHEMA）为第2网络物质，制备了多孔半互穿温敏水凝胶。考察了不同分子质量致孔剂（PEG1000、PEG1500、PEG2000）、致孔剂质量、交联剂BIS质量、PHEMA/NIPAm质量比对凝胶结构和性能的影响。并用FT-IR、SEM、DSC、BET和称重法对凝胶进行性能测试。结果表明，最佳制备条件为：m（PHEMA）/m（NIPAm）=0.25，BIS质量为单体总质量的2.67%，PEG分子质量为1 000~2 000，PEG质量为单体总质量的40%。凝胶孔径为10~20 μm，室温20℃下20 min凝胶可以吸收60%以上水分，90 min可以达到溶胀平衡，50℃下10 min内失去90%以上的水分，其LCST在35.8℃左右。

By using N-isopropylacrylamide (NIPAm) as monomer,polyethylene glycol (PEG) as porogenic agent,poly (methylacrylic acid-beta hydroxy ethyl ester)(PHEMA) as second network substance,the thermosensitive porous semi-interpenetrating network hydrogels are prepared.Effects of different molecular weight porogenic agents (PEG1000,PEG1500,PEG2000),dosage of porogenic agent,crosslinker dosage and mass ratio of PHEMA/NIPAm on hydrogels structure and properties are investigated.The prepared hydrogels are characterized by FT-IR,SEM,DSC,BET and gravimetric method.The optimal preparation conditions are:m(PHEMA)/m(NIPAm)=0.25 (weight ratio),crosslinker dosage accounting 2.67% of total monomer,PEG molecular weight in the range of 1 000-2 000,and PEG dosage accounting 40% of total monomer.It is detected that pore sizes of hydrogels are 10-20 microns.At room temperature 20℃,the hydrogels can absorb more than 60% of water in 20 minutes,and can reach swelling equilibrium in 90 minutes.The hydrogels can lose more than 90% of water at 50℃ in 10 minutes.The lower critical solution temperature is about 35.8℃.

杨毅(1992-),男,硕士生,研究方向为环境安全,1253122401@qq,com