HDPE预辐射接枝NIPA/AAc的性能研究

高密度聚乙烯膜(HDPE)在N2保护下预辐射接枝N-异丙基丙烯酰胺(NIPA)和丙烯酸(AAc)，制备了既具有温度敏感又兼具pH敏感的水凝胶，应用傅立叶变换红外光谱(FTIR)、差示扫描量热仪(DSC)、扫描电镜(SEM)，研究了该水凝胶的接枝物组成、物理性质以及表面形态。结果表明接枝复合物在不同pH值的介质环境中表现出不同的温敏特性：在酸性条件下随温度升高，体积溶胀增加，表现为“热胀温敏水凝胶”；在中性或碱性条件下随温度升高，溶胀体积在相变温度附近急剧收缩，表现为“热缩温敏水凝胶”。

Characteristic study of pre-irradiated HDPE grafted with NIPA/AAc

HDPE preirradiated under nitrogen protection was grafted with NIPA/AAc. The grafted hydrogel is temperature and pH sensitive. FTIR, DSC, SEM were used to study the composition, properties and surface morphology of the hydrogel. Results showing that LCST characteristics was different under different pH environment. Under acid condition, hydrogel volume increased with increasing temperature, indicating the hydrogel being heat expansive and temperature sensitive. Under neutral or alkaline condition, hydrogel volume contracted rapidly near phase transition with increasing temperature, indicating the hydrogel being heat shrinking and temperature sensitive.