聚乙烯醇/磷虾蛋白纤维的氢键作用机制及其性能

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

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%。

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.