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采用溶液共混浇膜法制备了不同单宁含量的聚乙烯醇/单宁共混膜材料,利用扫描电镜(SEM)、广角X-射线衍射(WAXD)及示差扫描量热分析(DSC)对共混膜的结构进行了表征.结果表明,单宁和聚乙烯醇具有良好的相容性,聚乙烯醇的结晶能力及熔点均随单宁的加入量增大而稍降低.少量戊二醛的轻度交联作用使单宁在共混膜中非常稳定,在水中浸泡24 h后也仅有不到1.8%的单宁(相对膜中单宁总质量)渗出.接触法抗菌试验表明,所制备的共混膜对大肠杆菌(E.coli,CMCC 44103)、金黄色葡萄球菌(S.aureus,ATCC6538)和表皮葡萄球菌(S.epidermidis,ATCC 12228)都具有良好的抗菌能力,且随着单宁含量的升高而增强.
Poly (vinyl alcohol) / tannin blend membranes with different tannin contents were prepared by solution blending and casting method. The morphology, morphology, morphology and morphology of PVA / tannin blend membranes were characterized by scanning electron microscopy (SEM), wide angle X-ray diffraction (WAXD) and differential scanning calorimetry The results showed that tannin and polyvinyl alcohol had good compatibility and the crystallization ability and melting point of polyvinyl alcohol decreased slightly with the addition of tannin.A small amount of glutaraldehyde The tannin was very stable in the blend membrane with tannin exudation of less than 1.8% tannin (relative to the total tannin in the membrane) after immersion in water for 24 h. , The prepared blend membrane has good antibacterial ability against E. coli (CMCC 44103), S. aureus (ATCC6538) and S. epidermidis (ATCC 12228), and With tannin content increased.