摘要
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.
Wattle tannin（TN）,a kind of polyphenols compound originated from black wattle,was introduced into poly（vinyl alcohol）（PVA） to prepare PVA/TN blend films by solution blending method.Glutaraldehyde was used to slightly crosslink PVA/TN blend films.The PVA/TN blend films were characterized by scanning electron microscopy（SEM）,wide-angle X-ray diffraction（WAXD） and differential scanning calorimetry（DSC）.The SEM observations revealed that PVA and TN was miscible in the blend films,which may due to the strong intermolecular hydrogen bonding between the hydroxyl groups from PVA and TN.The melting temperature of the blend film decreased from 231.7℃ to 221.3℃ when the TN content in the blend film increased from 0 to 20%,but the crystallinity of PVA was slightly decreased.It was found that less than 1.8% of the total amount of TN in blend films could be leached out when the blend films were soaked in water even for 24 h.This implies the good stability of PVA/TN blend films in water,which is beneficial to the long duration of antibacterial activity.The antibacterial activities of PVA/TN blend films were challenged by Escherichia coli（CMCC 44103）,Staphylococcus epidermidis（ATCC 12228） and Staphylococcus aureus（ATCC 6538） with contact mode.The results showed that with the addition of TN,these PVA-based polymer films exhibited strong antibacterial activities against both gram-negative and gram-positive bacteria.For instance,only 0.5% of E.coli was survived on the blend film with 20% TN after 1 h contacting.Therefore,the PVA/TN blended films may have great potential in packaging material and coating fields.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2012年第2期125-130,共6页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号21034003)资助项目
关键词
单宁
聚乙烯醇
共混膜
抗菌
Tannin
PVA
Blend films
Antibacterial activity
