摘要
目的利用低温等离子体处理PLA膜以提高其亲水性及粘附性,为制备PLA/纳米纤维素复合膜提供一种方法。方法利用单因素试验法探究低温等离子体处理时的放电电压(50~175V)和放电时间(10~50s)对PLA膜表面亲水性和粘附性的影响规律。通过测定PLA膜表面接触角及PLA/纳米纤维素复合膜的剥离强度,分析亲水性及粘附性的变化。利用原子力显微镜观察其微观表面形貌、X射线光电子能谱分析PLA膜表面由疏水性向亲水性转变的机理,并对PLA膜的力学性能及阻隔性能进行分析。结果PLA膜在低温等离子体条件(放电电压为125V、放电时间为40s、电极距离为4.5cm,氧气流速为1 mL/min,真空度为16.0 kPa)下处理后,其亲水性及与纳米纤维素膜的粘附性达到最佳。此时,PLA膜的接触角由90.0°降至42.4°,PLA/纳米纤维素复合膜的剥离强度为39.5 N/m。结论低温等离子体处理使PLA膜表面由疏水性转变为亲水性,且处理后的PLA可较为牢固地与纳米纤维素膜粘附在一起,从而为PLA/纳米纤维素复合膜的制备提供了一种可行方法。同时,低温等离子体处理对PLA膜的力学性能及阻隔性能没有显著影响。
The work aims to treat PLA films with low temperature plasma to improve their hydrophilicity and adhesion,in order to provide a method for the preparation of PLA/CNF film.Single factor experiment was used to investigate the influence of discharge voltage(50-175 V)and discharge time(10-50 s)on the surface hydrophilicity and adhesion of PLA films during low temperature plasma treatment.The surface contact angle of PLA film and the peel strength of PLA/CNF film were measured to analyze the changes of hydrophilicity and adhesion.The surface morphology was observed by atomic force microscopy;the mechanism of surface property changing from hydrophobicity to hydrophilicity was analyzed according to the X-ray photoelectron spectroscopy results,and the mechanical and barrier properties of PLA film were analyzed.PLA film had the best hydrophilicity and adhesion with CNF film after treated by low temperature plasma(125 V discharge voltage,40 s discharge time,4.5 cm electrode distance,1 mL/min oxygen flow rate and 16.0 kPa vacuum degree).At this time,the contact angle of the PLA film reduced from 90°to 42.4°,and the peel strength of PLA/CNF film was 39.5 N/m.Low temperature plasma treatment changes the hydrophobic surface of PLA film to a hydrophilic one,and the treated PLA can be firmly stuck to the CNF film,thus providing a feasible method for the preparation of PLA/CNF film.Meanwhile,low temperature plasma treatment does not affect significantly the mechanical and barrier properties of PLA film.
作者
高琳
鲁鹏
吴敏
陈顺利
孟志谦
GAO Lin;LU Peng;WU Min;CHEN Shun-li;MENG Zhi-qian(College of Light Industry and Food Engineering,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Clean Pulp and Papermaking and Pollution Control,Nanning 530004,China)
出处
《包装工程》
CAS
北大核心
2020年第15期134-141,共8页
Packaging Engineering
基金
广西清洁化制浆造纸与污染控制重点实验主任基金(ZR201708)。
