摘要
可生物降解、具有良好水溶性、优异成膜性及黏结力的聚乙烯醇在包装领域具有极大的应用潜力,但其较低拉伸强度和阻隔性能严重影响应用效果。笔者以自制氧化石墨烯为加强相,以维生素C为绿色还原剂,制备了石墨烯/聚乙烯醇复合薄膜,重点研究了石墨烯的含量对复合薄膜性能的影响。结果表明,石墨烯的引入不仅可明显改善聚乙烯醇基复合薄膜的拉伸强度和阻水阻氧性能,而且还可赋予其导电性能。但是石墨烯的用量存在一个阈值:当石墨烯质量分数从1%逐步增加到5%时,复合薄膜的拉伸强度、对水的接触角和导电率均逐渐增加,吸水率和氧气透过系数均逐渐降低;但当石墨烯质量分数超过5%时,上述效果将不复存在,故将质量分数5%定为石墨烯/聚乙烯醇复合薄膜中石墨烯用量的阈值。
As one of biodegradable polymers,polyvinyl alcohol(PVA)has great potential applications in packaging because of its special water solubility,filmforming property and excellent adhesion,however,this potential application is limited by its poor mechanical strength and barrier property.In this paper,a type of graphene/polyvinyl alcohol(rGO/PVA)film with good tensile strength and barrier performances as well as certain electrical conductivity was fabricated by using selfmade graphene oxide and vitamin C as a strengthen phase and green reducing agent,respectively.The research was focused on the effects of the rGO content(1 wt%,3 wt%,5 wt%,and 7 wt%)on the performance of the rGO/PVA composite film.The results showed that the introducing of graphene into the PVA matrix significantly improved the tensile strength,water resistance and oxygen resistance of the PVA based composite films.In addition,the adding of graphene provided the composite certain electrical conductivity.However,the additive dosage of graphene had a threshold value.With an increase in graphene loading in the rGO/PVA film from 1wt%to 5 wt%,the tensile strength,contact angle of water and electrical conductivity increased gradually,but its water absorption rate and oxygen permeability coefficient decreased gradually.When the dosage of the graphene in the rGO/PVA film increased from 5 wt%to 7 wt%,the previously mentioned improvement was stopped.Therefore,in this study,the graphene loading of 5 wt%was set as the threshold value in the rGO/PVA film fabrication.At this case,the electrical conductivity of the composite film,the tensile strength,contact angle of deionized water,water absorption rate,oxygen penetration and oxygen permeability were 4.2×10-5s/cm,78.02 MPa,84.9°,38.9 wt%,3.96 cm3/(m2〖DK〗·24h)and 0.902×10-15cm3〖DK〗·cm/(cm2〖DK〗·s〖DK〗·Pa),respectively.The experiment results can provide reference values for the realization of the rGOreinforced PVA film with high mechanical and barrier properties in packaging industry.
作者
王希
李影
连海兰
陈一鸣
郭露
汪倩
徐长妍
WANG Xi;LI Ying;LIAN Hailan;CHEN Yiming;GUO Lu;WANG Qian;XU Changyan(College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,China)
出处
《林业工程学报》
北大核心
2018年第2期109-115,共7页
Journal of Forestry Engineering
基金
国家自然科学基金项目(31370567)
江苏省优势学科建设项目(PAPD)
2017年南京林业大学大学生科技创新项目
关键词
聚乙烯醇
还原氧化石墨烯
复合薄膜
阻隔性能
拉伸性能
导电性能
polyvinyl alcohol
reduced graphene oxide
composite film
barrier properties
tensile strength
electrical conductivity
