壳聚糖/聚乙烯醇共混纤维的结构与性能

采用溶液纺丝法制得壳聚糖/聚乙烯醇共混纤维.用FT-IR、XRD、SEM表征了其结构并测试了其力学性能.结果表明,壳聚糖与聚乙烯醇在共混纤维中具有良好的相容性;共混纤维的抗张强度随壳聚糖脱乙酰度的增大得到改善;聚乙烯醇对共混纤维的力学性能和保水性能有明显影响.壳聚糖脱乙酰度为90.2%时,共混纤维的抗张强度在聚乙烯醇含量为20%(wt)最大,其干、湿态抗张强度分别达到1.82cN/d和0.81cN/d,比纯态壳聚糖纤维的干、湿态抗张强度分别提高21.3%和14.1%;共混纤维的保水值均高于170%,大于纯态壳聚糖纤维的保水值(120%).

Structure and Preparation of Chitosan/Poly(vinyl alcohol) Blend Fibers

The chitosan/poly (vinyl alcohol) blend fibers were prepared by wet\|spining, and characterized by FT\|IR, X\|ray diffraction, SEM and measurements of mechanical properties and water\|retention properties. The results indicated that good compatibility existed between chitosan and poly (vinyl alcohol) molecule in the blend fibers, a the water\|retention properties and mechanical properties of the blend fibers increase with the increase of PVA content in the blends and the mechanical strength of the blends is also related to PVA content and the degree of deacetylation of chitosan. The best mechanical strength values of the blend fibers are 1.82 cN/d (dry state) and 0.81 cN/d (wet state) were obtained when PVA content was 20% and the degree of deacetylation of chitosan in 92.2%, respectively. The water\|retention values of the blend fibers were between 170% and 241%, obviously higher than pure chitosan fiber (120%).