摘要
将胶原纤维(CF)与聚乙烯醇(PVA)按不同比例进行共混、冻干,制得CF/PVA复合海绵。采用红外光谱、X射线衍射和扫描电镜对CF/PVA复合海绵进行了结构表征,并考察了复合海绵的吸水性、保水性、透水汽性、力学性能及吸湿动力学性能。结果表明:CF/PVA复合海绵的最佳共混比例为3∶7,其综合性能较好,其孔隙率与透水汽率分别达到95.44%和2 786g/(m2·d),最为接近医用敷料推荐值2 500g/(m2·d);吸水率与保水率分别为19.32g/g和7.11g/g;力学性能较纯的胶原纤维海绵得到了显著的改善。CF/PVA复合海绵的吸湿动力学过程符合Langmuir二级动力学吸附方程,说明有多个水分子在同一个活性点(极性基)上发生了多层的物理吸附。CF/PVA复合海绵的性能研究,为构建理想的胶原纤维基生物医用材料提供了良好的理论依据。
Collagen fibers （CF） and Polyvinyl alcohol （PVA） were blended with different quantity ratios and then freeze - dried, by this way the blend sponges （CF/PVA） were prepared. The structure of CF/PVA blend sponges was studied by using FF - IR, X - ray diffraction and SEM. Their water absorption and retention, permeability rate, mechanical properties and moisture ab- sorption kinetics of CF/PVA blend sponges were tested. The experimental results show that a better comprehensive performance of CF/PVA blend sponges is obtained with the optimal blend ratio （3： 7） of CF and PVA. The porosity and water vapor permeability rate of the blend sponges are 95.44% and 2 786g / （m2 · d） respectively, which is close to the numerical value of medical dressings of 2 500g/（ m2 · d）. The water absorption and retention are 19.32g/g and 7. llg/g respectively. The mechanical performanco, of this CF/PVA blend film is improved significantly than that of the pure collagen fibers. The water adsorption process of CF/PVA blends could be characterized by the second - order moisture - adsorption kinetic equation after kinetic analysis of moisture adsorption under RH85% and RH43%, which proves that the muhilayer physisorption of multiple water molecules is in the same activity point. The study of CF/PVA blends provides a preferable theory bases for developing ideal CF -based biomedical materials.
出处
《中国皮革》
CAS
北大核心
2013年第21期20-25,共6页
China Leather
基金
成都市科技计划项目(10GGYB345SW-023)
关键词
胶原纤维
聚乙烯醇
复合海绵
吸湿动力
collagen fibers
polyvinyl alcohol
blend sponges
moisture absorption kinetics
