摘要
通过等离子体增强化学气相沉积技术得到的SiOx沉积膜作为聚乳酸-壳聚糖(PLA-CS)的过渡层,从而制备具有三层结构的PLA/SiOx/CS复合膜。通过表面接触角、剥离强度测试及扫描电子显微镜考察不同时间氧气等离子体处理(0,30,60 s)对SiOx表面及PLA-CS界面的影响,并对PLA/SiOx/CS膜的阻隔性和抑菌性进行表征。结果发现,随着氧等离子体轰击处理时间的延长,SiOx表面亲水性提高,且PLA/SiOx/CS中SiOx与CS的层间结合强度随之增加。SEM图像可见,PLA/CS膜出现了明显的层间分离,而增加过渡层SiOx且氧等离子体处理60 s的PLA/SiOx/CS膜中层间界面结合紧密。此外,与PLA基膜相比,通过CS的有效复合得到的PLA/SiOx/CS显著改善了PLA膜的阻氧性及对大肠杆菌和金黄色葡萄球菌的抑菌性,而使其阻湿性略有降低。
The chitosan(CS) coatings,an advanced food packaging material, were synthesized via chemical route on the substrate of polylactic acid(PLA),with the SiOx-transition layer pre-deposited by plasma enhanced chemical vapor deposition(PECVD).The influence of the SiOx-transition layer and O-plasma irradiation time on the PLA-CS interfacial adhesion and properties of PLA/SiOx/CS multilayers was investigated.The results show that that the SiOx-transition layer and O2-plasma irradiation time had a major impact.To be specific,as the O2-plasma irradiation time increased,the adhesion at SiOx/CS and PLA/SiOx interfaces and wettability of SiOx increased,possibly because of the formation of radicals on plasma roughened SiOx surfaces;the CS/SiOx coatings on PLA-membrane dramatically improved antibacterial activity(against E.coli and S.aureus) and significantly decreased O2-permeation,in spite of a slight decrease of moisture resistance. We suggest that the PLA/SiOx/CS multilayers be of much economic impact in food industry.
作者
李亚娜
任纪州
罗毅诚
贺庆辉
王北海
路婉秋
Li Yana;Ren Jizhou;Luo Yicheng;He Qinghui;Wang Beihai;Lu Wanqiu(Mechanical Engineering College,Wuhan Polytehcni University,Wuhan 430023,China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2020年第3期250-254,共5页
Chinese Journal of Vacuum Science and Technology
基金
湖北省自然科学基金面上项目(2017CFB494)
武汉轻工大学科研项目(2019y18)
武汉轻工大学科研项目(2020Y08)。
