异丙基丙烯酰胺接枝改性聚氨酯多孔膜及其理化性能研究

N-isopropyl acrylamide grafted polyurethane porous membrane and studies on its physicochemical properties

采用紫外辐照法将N-异丙基丙烯酰胺(NIPAAm)接枝于聚氨酯(PU)膜表面,得到聚氮异丙基丙烯酰胺接枝改性PU膜(PU-g-PNIPAAm)。采用SEM和IR对接枝前后PU膜的形貌结构及成分进行表征分析,计算其接枝率和透湿率,并考察其在不同温度下的溶胀性能。结果表明,PNIPAAm通过紫外辐照成功接枝于PU膜表面;当NIPAAm单体浓度为5%(质量分数)时,接枝率最高;PU膜的透湿率在接枝后显著降低,更接近于人体皮肤;PU-g-PNIPAAm膜在32℃附近发生明显的溶胀行为变化。该接枝改性多孔膜有望用作人工皮肤的表皮材料。

N-isopropyl acrylamide （NIPAAm）grafted polyurethane （PU）was prepared by UV irradiation.The grafted PU membrane was observed by SEM and its compositions was analyzed by IR.In addition,the grafting ratio and the water vapor transmission rate were calculated,and the swelling behavior in different temperatures was studied.The results show that,NIPAAm has been grafted onto PU membrane successfully and the graft-ing ratio was up to the maximum when the concentration of NIPAAm monomer was 5wt%;the water vapor transmission rate has dropped obviously and was more close to that of human skin;also,the swelling behavior of PU-g-PNIPAAm membrane has changed dramatically at near 32 ℃,which was the lower critical solution temperature （LCST）of PNIPAAm hydrogel.So,the PU-g-PNIPAAm membrane has the potential to be used as the epidermis of artificial skin.