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Poly(vinyl alcohol)/collagen (PVA/COL) micro-nanofibers were successfully prepared by electrospinning process. Water, green, and non-toxic was used as the solvent. The electrospun mats consisted of micro-nanoscale fibers with mean diameter ranging from approximately 363 nm to 179 nm. It was observed that the mean diameters of PVA/COL electrospun fibers decreased with increasing collagen content. The effects of PVA/COL blending ratio on the rheological behavior of PVA/COL blended solutions were investigated by rotate rheometer. It was found that PVA/COL blended solutions behaved as Non-Newtonian fluids. With increasing collagen content, the Non-Newtonian index (n) of PVA/COL blended solutions decreased. Meanwhile, a linear relationship was found between the Non-Newtonian index (n) and the mean diameters of the PVA/COL micronanofibers. The chemical structures of PVA/COL electrospun fibers were also characterized by FTIR. 相似文献
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The blend films with gelatin and poly(vinyl alcohol) (PVA) were prepared by a solution casting method. The compatibility between gelatin and PVA in the blend films was investigated. The transmittance, Fourier-transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), thermogravimetry analysis (TG), and differential scanning calorimetry (DSC) were employed to characterize the resultant blend films. According to optic result, the opacity of the blend film at the ratio of 20/80 (w/w, Gel to PVA) was the lowest, indicating the best compatibility between Gel and PVA at the ratio. The results oflR, XRD, DSC, and TG revealed an intensive interaction and good compatibility between them in the blend film at the ratio. The mechanical properties and solubility showed that PVA content in the blend films obviously affected the elongation at break and solubility. The mechanical properties and water resistance of gelatin film may be improved by the introduetion of PVA. 相似文献
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铬的污染源及其危害 总被引:1,自引:0,他引:1
汤克勇 《四川大学学报(工程科学版)》1997,7(1):33-37,48
本文介绍了铬污染的来源并对其危害进行了分析和讨论,从而说明了治理铬污染的必要性和重要性。 相似文献
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汗液对皮革耐热稳定性的影响 总被引:1,自引:0,他引:1
采用热台显微镜、热重分析等方法研究了未鞣制皮粉、铬鞣皮粉和戊二醛鞣制皮粉的热收缩和热降解行为,探索了这些试样在受到汗液浸泡作用时热收缩和热降解行为方面所发生的变化,讨论了发生这些变化的机理。 相似文献
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本文研究了胶原蛋白经酶水解后所得胶原水解物的功能特性。酶解后胶原蛋白分子量减小,胶原酶解产物的吸水性、保水性、溶解性较酶解前都得到提高,但是吸油性、起泡性和泡沫稳定性都明显下降。对胶原蛋白进行有限水解,使其功能特性发生改变,有利于其在化妆品以及食品添加剂等方面的应用。 相似文献
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采用异佛尔酮二异氰酸酯(IPDI)、二羟甲基丙酸(DMPA)、聚四氢呋喃(PTMG)为原料制备聚氨酯预聚体,分别以乙二醇(EG)、乙二胺(EN)和正丁胺(n-butylamine)为扩链剂制备了水性聚氨酯皮革涂饰剂,研究了该涂饰剂所成膜的力学性能、断裂伸长率和吸水性。结果表明,以正丁胺为扩链剂制备的水性聚氨酯膜的断裂伸长率最好,高达1454%;其玻璃化转变温度可达-82℃,耐水性也比用其它两种扩链剂合成的产品好。 相似文献