摘要
将酵母菌作为微生物发泡剂引入到聚乙烯醇(PVA)/羟乙基纤维素(HEC)复合材料中,结合循环冷冻-解冻法制备PVA/HEC多孔复合材料。测试了不同实验条件下PVA/HEC多孔复合材料的孔隙率、吸水性、保水性。通过FTIR和SEM表征样品的微观结构;采用热重分析仪(TG)、X射线衍射仪(XRD)、万能拉力试验机分析样品热稳定性、结晶性、力学性能。结果表明:酵母菌发泡PVA/HEC多孔复合材料孔呈大孔套小孔的椭圆状开孔结构,具有快速吸水响应性;保水性良好,24 h后保水率降至最低;与PVA/HEC复合材料相比,PVA/HEC多孔复合材料热稳定性和力学性能均有所提高,压缩强度和极限抗压应力分别是13.2、6.4 MPa。
The yeast as microbial foaming agent was introduced into polyvinyl alcohol （PVA）/ hydroxyethyl cellulose （HEC） composites. Then, PVA/HEC porous composites were prepared by cyclic freeze-thaw process. The porosity, water absorption and water retention property of porous composites were tested in different experimental conditions. The microstructure of samples was characterized by FTIR and SEM. The thermal stability, crystallinity and mechanical properties of samples were analyzed by thermal gravimetric analyzer （TG）, X-ray diffraction （XRD）, and universal tensile testing machine, respectively. The results show that the PVA/HEC porous composites foamed by yeast exhibit elliptical open-cell structures that large cells are surrounded by small cells. The obtained porous composite has fast water absorption response rate and good water retention. Its water retention rate reaches the lowest value after 24 h. Meanwhile, the thermal stability and mechanical properties of PVA/HEC porous composite foamed by yeast improve comparing with that of the PVA/HEC porous composite without addition of yeast. The compression strength and the ultimate compressive stress are 13.2 MPa and 6. 4 MPa, respectively.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2017年第5期505-512,518,共9页
Fine Chemicals
基金
陕西省自然科学基础研究计划项目(2015JM2069)
陕西省技术转移与重点科技成果推广计划项目(2016CG-10)~~
关键词
聚乙烯醇
羟乙基纤维素
多孔复合材料
微生物发酵
冷冻-解冻
功能材料
polyvinyl alcohol
hydroxyethyl cellulose
porous composite
microbial fermentation
freeze- thaw
functional materials
