纤维素超细纤维增强大豆分离蛋白透光复合膜性能研究

Studies of Ultrafine Cellulose Fiber Reinforced Soy Protein Isolate Composite Film with High Light Transmittance

以醋酸纤维素为原料,由静电纺丝方法得到平均直径为430nm的纤维素超细纤维,将该纤维与大豆分离蛋白复合制备了一种新型的超细纤维增强透光复合膜.采用扫描电镜、拉伸、三点弯曲和透光率试验等对其结构、力学和透光性进行了分析和表征.结果表明:超细纤维与大豆分离蛋白基体具有良好的界面相互作用;超细纤维对复合材料起到了增强增韧的效果.而且,复合膜具有良好的透光率.即使超细纤维质量分数达到13%,该膜在700nm波长处的透光率仍然可以达到77%.

Ultrafine cellulose fibers with the diameter of ca. 430 nm were synthesized by electrospinning. The cellulose fibers were embedded into soy protein isolate （SPI） to fabricate reinforced composite films. Their light transmittance, morphology and mechanical properties were characterized by scanning electron microscopy （SEM）, tensile test and three-point bending test. Due to the ultrafine diameter of cellulose nanofibers, the composite film showed improved fiber/resin interracial adhesion. This led to high visible light transmittance even though the composite film had a fiber mass fraction as high as 30%. The composite film exhibited improved mechanical properties as compared to the neat SPI film.