聚乙烯醇/磷虾蛋白纤维的氢键作用机制及其性能

为解决聚乙烯醇(PVA)难以热塑加工和功能单一的问题,以磷虾蛋白(AKP)和水为增塑剂,通过熔体纺丝制备了PVA/AKP纤维。通过红外光谱仪表征了PVA/AKP纤维中的氢键作用,并分析氢键作用机制。借助X射线衍射仪、扫描电子显微镜、差示扫描量热仪和单纤维强力仪等分析了PVA/AKP纤维的结晶性、形态结构、热性能和力学性能等。结果表明:随着AKP质量分数的增加,PVA/AKP纤维中分子内氢键含量和结晶度呈先增大后减小趋势,当AKP质量分数为2%时,PVA/AKP纤维中分子内氢键含量达到最大值(85.37%),结晶度也达到最大值(48%),该条件下纤维断裂强度达到最大值,为2.15 cN/dtex;AKP的加入有助于提高PVA纤维的表面光滑性,PVA/AKP纤维断面呈规则圆形;PVA/AKP纤维对碱溶液的响应性更强,在水中浸渍2 h后纤维吸水率恒定在36%。

Hydrogen bonding mechanism and properties of polyvinyl alcohol/krill protein fibers

To solve the difficult thermoplastic processing and single function of polyvinyl alcohol(PVA), krill protein(AKP) and water were used as plasticizers to prepare PVA/AKP fibers by melt spinning. The hydrogen bonding in PVA/AKP fiber was characterized by infrared spectrometer, and the mechanism of hydrogen bonding was analyzed. Additionally, the crystallinity, morphology, thermal properties and mechanical properties of PVA/AKP fibers were characterized by X-ray diffractometer, scanning electron microscope, differential scanning calorimeter and single fiber strength tester, respectively. The results show that with the increase of AKP mass fraction, the content of intramolecular hydrogen bond and crystallinity of PVA/AKP fibers firstly increases and then decreases. When the mass fraction of AKP is 2%, the content of intramolecular hydrogen bond in PVA/AKP fibers reaches the maximum value (85.37%), and the crystallinity also reaches the maximum value (48%), and the fiber breakage strength reaches a maximum of 2.15 cN/dtex. AKP is helpful to improve the surface smoothness of the fiber, the fiber cross section presents regular round. Additionally, PVA/AKP fibers are more responsive to alkaline solutions, and the water absorption rate of the fiber is a constant of 36% after 2 h.