采用羟丙基纤维素(Hydroxypropylcellulose,HPC)和聚丙烯腈(PAN)为原料制备了系列共混温敏膜;研究了原料配比、pH值以及温度对共混膜溶胀速率的影响.结果表明,当温度在最低临界溶解温度(LCST)以下且pH=1.4时,HPC/PAN共混膜的溶胀速率随着体系中HPC用量的增加而加快,高分子链的松弛过程成为膜溶胀的主要控制因素;在pH=7.4的弱碱性条件下,水分子的扩散渗透成为膜溶胀过程的主要控制因素.温度对溶胀速率的影响与pH值有关,pH值对膜溶胀速率的影响与温度有关.
Series of thermo-sensitive blending films are prepared from hydroxypropylcellulose and polyarcyloni-trile. The effects of materials ratio, pH value and temperature on these blending films swelling velocity are investigated. As temperature is lower than LCST, different results are found blending films samples are dipped in acid or base condition, such as pH value being 1. 4 and 7.4 respectively. Results from pH value of 1. 4 show that swelling velocity of HPC/PAN blending films increases with the addition of HPC, film's swelling is mainly controlled by polymer chain relaxation. But, it is controlled by water molecules diffusion under pH value of 7. 4. Swelling velocity is affected by both temperature and pH value.
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