基于介孔纳米SiO_(2)抗氧活性组装体的聚乙烯基共混薄膜制备与性能  

Preparation and properties of polyethylene-based blended films base on mesoporous nano-SiO_(2)antioxidant active assembly

作　　者：唐有凯 丘晓琳 弓雪峰 唐亚丽 TANG Youkai;QIU Xiaolin;GONG Xuefeng;TANG Yali(School of Mechanical Engineering,Jiangnan University,Wuxi 214122,China;Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment Technology,Wuxi 214122,China)

机构地区：[1]江南大学机械工程学院,无锡214122 [2]江苏省食品先进制造装备技术重点实验室,无锡214122

出　　处：《复合材料学报》2022年第1期169-181,共13页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51503084);国家自然科学基金(31671909);江苏省食品先进制造装备技术重点实验室开放课题(FM-201606);无锡市科技发展资金(WX18ⅡAG722)。

摘　　要：以十六烷基三甲溴化铵(CTAB)为模板剂,制备介孔纳米SiO_(2),以其为载体搭载α-生育酚形成抗氧活性组装体(简称组装体)。以组装体为抗氧活性因子,以低密度聚乙烯(LDPE)为基材,引入线性低密度聚乙烯(LLDPE)、聚烯烃类热塑性弹性体(POE)进行共混改性,并以挤出流延法制备系列控释型抗氧活性膜。通过TEM、XRD、氮气吸附脱附、TGA、力学性能测试和释放性能测试等,研究了LLDPE、POE、α-生育酚、组装体四种添加物对活性膜力学、控释等性能的影响,并研究添加物间协同作用。结果表明,引入添加物令活性膜热加工、力学、控释性能显著提升:α-生育酚搭载于组装体后热分解温度提升70%,利于活性膜热加工;各添加物皆不同程度提升薄膜力学性能,其中,POE及组装体的组合添加具有协同增强作用,薄膜拉伸强度提升率为其他样品2.5倍以上;活性膜控释性能显著,组装体令α-生育酚扩散系数下降45%~47%,薄膜结晶度与α-生育酚释放速率呈负相关,利于活性膜释放调控。所制备活性膜可用于软塑活性包装释放调控,且力学、热加工等性能优于改性前,在功能性活性包装材料领域具有广阔的应用前景。The mesoporous nano-SiO_(2)carrier was prepared with cetyltrimethylammonium bromide(CTAB)that served as template.Thenα-tocopherol(α-TCP)was integrated into the carrier to form antioxidant active assembly.Low-density polyethylene(LDPE)active films were prepared by flat extrusion.Linear low-density polyethylene(LLDPE)and polyolefin thermoplastic elastomer(POE)were used as modified resin to regulate the films for better performance.The assembly andα-TCP were introduced into the films,serving as antioxidant active factor.The structure of the nano-SiO_(2)carrier was studied by TEM,XRD and nitrogen adsorption/desorption apparatus.The thermal stability of the assembly was investigated by thermal gravimetric analysis(TGA).The physical and controlled release properties of the films were determined by mechanical performance test,release performance test,etc.Meanwhile,the additives’synergistic effects on the films were studied.The results show that the active films’thermal processing,mechanical and controlled release properties are significantly improved with introduction of the additives.The assembly’s insulating effect leads to thermal resistant temperature ofα-TCP,which is integrated into assembly,increase by 70%when compared with the baredα-TCP.As compared with pure LDPE film,the mechanical properties of the active films are significantly improved by the additives.The tensile strength increase rate of the film modified by POE and assembly is more than 2.5 times as other samples’.As compared with the films modified with the baredα-TCP,the assembly reduces the diffusion coefficient ofα-TCP by 45%-47%,which shows the remarkable controlled release property of the active films.The films’crystallinity is negatively correlated with release rate of the antioxidant substance.As a result,the prepared materials can be used to regulate active substances’release rate of antioxidant active package.And it shows a good potential for strengthing and toughing package films.

关 键 词：抗氧活性包装 抗氧活性组装体 共混膜 力学性能 协同增强 结晶度 控释 

分 类 号：TS206.4[轻工技术与工程—食品科学]