以豌豆分离蛋白(pea protein isolate,PPI)和普鲁兰多糖(pullulan,PUL)为原料,大蒜素(allicin,AC)作为抗菌物质,利用静电纺丝技术制备纳米纤维材料。考察AC添加量对纳米纤维的结构特性、形貌特征、直径分布以及抑菌效果的影响。红外光...以豌豆分离蛋白(pea protein isolate,PPI)和普鲁兰多糖(pullulan,PUL)为原料,大蒜素(allicin,AC)作为抗菌物质,利用静电纺丝技术制备纳米纤维材料。考察AC添加量对纳米纤维的结构特性、形貌特征、直径分布以及抑菌效果的影响。红外光谱结果表明AC被成功包裹在PPI/PUL复合纳米纤维中。扫描电子显微镜显示AC的加入使纳米纤维周围出现大小不等的“球状”结构,且“球状”结构的尺寸随AC添加量增大逐渐增大(P<0.05),同时纳米纤维直径呈现逐渐减小的趋势(P<0.05)。当AC添加量小于15%时,随着AC添加量增大,复合纳米纤维的弹性模量和拉伸强度逐渐增大(P<0.05),断裂伸长率逐渐减小(P<0.05)。此外,当AC添加量大于10%时,PPI/PUL/AC复合纳米纤维表现出明显的抑菌效果,其中添加15%和20%AC的PPI/PUL/AC复合纳米纤维抑菌效果最明显,对大肠杆菌和金黄色葡萄球菌的抑菌圈直径分别高达到16.5 mm和12.8 mm。本研究将为新型绿色食品包装纳米材料的开发与应用提供创新性理论依据和技术指导。展开更多
This presentation predicts the elastic properties of three-dimensional(3D)orthogonal woven composite(3DOWC)by finite element analysis based on micro/meso repeated unit cell(RUC)models.First,the properties of fiber yar...This presentation predicts the elastic properties of three-dimensional(3D)orthogonal woven composite(3DOWC)by finite element analysis based on micro/meso repeated unit cell(RUC)models.First,the properties of fiber yarn are obtained by analysis on a micro-scale RUC model assuming fibers in a hexagonal distribution pattern in the polymer matrix.Then a full thickness meso-scale RUC model including weft yarns,warp yarns,Z-yarns and pure resin zones is established and full stiffness matrix of the 3DOWC including the in-plane and flexural constants are predicted.For thick 3DOWC with large number of weft,warp layers,an alternative analysis method is proposed in which an inner meso-RUC and a surface meso-RUC are established,respectively.Then the properties of 3DOWC are deduced based on laminate theory and properties of the inner and surface layers.The predicted results by the above two alternative methods are in good experimental agreement.展开更多
文摘以豌豆分离蛋白(pea protein isolate,PPI)和普鲁兰多糖(pullulan,PUL)为原料,大蒜素(allicin,AC)作为抗菌物质,利用静电纺丝技术制备纳米纤维材料。考察AC添加量对纳米纤维的结构特性、形貌特征、直径分布以及抑菌效果的影响。红外光谱结果表明AC被成功包裹在PPI/PUL复合纳米纤维中。扫描电子显微镜显示AC的加入使纳米纤维周围出现大小不等的“球状”结构,且“球状”结构的尺寸随AC添加量增大逐渐增大(P<0.05),同时纳米纤维直径呈现逐渐减小的趋势(P<0.05)。当AC添加量小于15%时,随着AC添加量增大,复合纳米纤维的弹性模量和拉伸强度逐渐增大(P<0.05),断裂伸长率逐渐减小(P<0.05)。此外,当AC添加量大于10%时,PPI/PUL/AC复合纳米纤维表现出明显的抑菌效果,其中添加15%和20%AC的PPI/PUL/AC复合纳米纤维抑菌效果最明显,对大肠杆菌和金黄色葡萄球菌的抑菌圈直径分别高达到16.5 mm和12.8 mm。本研究将为新型绿色食品包装纳米材料的开发与应用提供创新性理论依据和技术指导。
基金BASTRI Subtopic Research about Digital Sampler Technology of Body Structure Performance Study Based on Big Data Calculation Model,China(No.MIIT Civil aircraft special purpose MJ-2017-F-20)
文摘This presentation predicts the elastic properties of three-dimensional(3D)orthogonal woven composite(3DOWC)by finite element analysis based on micro/meso repeated unit cell(RUC)models.First,the properties of fiber yarn are obtained by analysis on a micro-scale RUC model assuming fibers in a hexagonal distribution pattern in the polymer matrix.Then a full thickness meso-scale RUC model including weft yarns,warp yarns,Z-yarns and pure resin zones is established and full stiffness matrix of the 3DOWC including the in-plane and flexural constants are predicted.For thick 3DOWC with large number of weft,warp layers,an alternative analysis method is proposed in which an inner meso-RUC and a surface meso-RUC are established,respectively.Then the properties of 3DOWC are deduced based on laminate theory and properties of the inner and surface layers.The predicted results by the above two alternative methods are in good experimental agreement.
