PBAT/EVOH共混薄膜的制备及其包装特性
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摘要
通过熔融共混挤出法制备不同质量比(9:1、8:2和7:3)的聚己二酸-对苯二甲酸丁二酯/乙烯乙烯醇共聚物(PBAT/EVOH)共混薄膜,研究EVOH的添加量对PBAT薄膜的力学性能、热学性能及阻隔性能的影响。结果表明:PBAT和EVOH共混体系是热力学不相容体系,随着EVOH添加量的增加,其氧气透过系数(OP)和水蒸气透过系数(WVP)逐渐降低。当添加30%的EVOH时,共混薄膜的OP和WVP达到最低值1.12×10~(-7) cm~3·m/(m~2·d·Pa)和1.19×10~(-7) g·m/(m~2·d·Pa),较纯PBAT薄膜分别降低66.8%和67.1%,说明EVOH的添加显著提高了薄膜的阻隔性能;10%EVOH不仅能使PBAT保持较好的韧性,还增强了薄膜的刚性,改善PBAT极易变形现象。
The different mass ratio(9:1,8:2 and 7:3)of PBAT/EVOH blend films were prepared by melt extrusion.The effects of EVOH on mechanical,thermal and barrier properties of PBAT/EVOH blend film were investigated.The results show that:the blend system of PBAT and EVOH is a thermodynamic incompatible system.With the increase of EVOH addition,the oxygen permeability coefficient(OP)and water vapor transmission coefficient(WVP)gradually decrease.When adding 30%EVOH,the OP and WVP of blend film reach to the lowest value of1.12×10~(-7) cm~3·m/(m~2·d·Pa)and 1.19×10~(-7) g·m/(m~2·d·Pa),66.76%and 67.13%lower than that of the pure PBAT films,indicating that the barrier properties of PBAT are significantly improved.10%EVOH can not only make PBAT maintain good toughness,but also enhance the rigidity of the film,and improve the PBAT deformation.
The different mass ratio(9:1,8:2 and 7:3)of PBAT/EVOH blend films were prepared by melt extrusion.The effects of EVOH on mechanical,thermal and barrier properties of PBAT/EVOH blend film were investigated.The results show that:the blend system of PBAT and EVOH is a thermodynamic incompatible system.With the increase of EVOH addition,the oxygen permeability coefficient(OP)and water vapor transmission coefficient(WVP)gradually decrease.When adding 30%EVOH,the OP and WVP of blend film reach to the lowest value of1.12×10~(-7) cm~3·m/(m~2·d·Pa)and 1.19×10~(-7) g·m/(m~2·d·Pa),66.76%and 67.13%lower than that of the pure PBAT films,indicating that the barrier properties of PBAT are significantly improved.10%EVOH can not only make PBAT maintain good toughness,but also enhance the rigidity of the film,and improve the PBAT deformation.
引文
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[3]Mohapatra A K,Mohanty S,Nayak S K.Study of thermomechanical and morphological behaviour of biodegradable PLA/PBAT/layered silicate blend nanocomposites[J].Journal of Polymers&the Environment,2014,22(3):398-408.
[4]司鹏.PLA/PBAT薄膜的制备及其降解性能研究[D].镇江:江苏科技大学,2016.
[5]邹阳雪.木质素/PBAT/PES复合材料的制备及性能研究[D].绵阳:西南科技大学,2016.
[6]王治洲,李晓芳,宋树鑫,等.PCL对PBAT薄膜气体透过率的影响[J].塑料科技,2017,45(11):56-61.
[7]Ren P G,Liu X H,Ren F,et al.Biodegradable graphene oxidenanosheets/poly-(butyleneadipate-co-Tereph-thalate)nanocomposite film with enhanced gas and water vapor barrier properties[J].Polymer Testing,2016,58:173-180.
[8]周志斌.无机纳米Si O2填充PLA/PBAT复合体系的制备及流变性能研究[D].株洲:湖南工业大学,2016.
[9]宁平,陈明月,肖运鹤.淀粉填充改性PBAT的结构与性能研究[J].化工新型材料,2010,38(7):116-119.
[10]王香云.PBAT/改性纤维素复合材料的制备与性能研究[D].乌鲁木齐:新疆大学,2016.
[11]Kit K M,Schultz J M,Gohil R M.Morphology and barrier properties of oriented blends of poly(ethylene terephalate and poly(ethylene 2,6-naphalate)with poly(ethylene-covinylac)[J].Polymer Engineering&Science,1995,35(8):680-692.
[12]Lagarón J M,Giménez E,Gavara R,et al.Study of the influence of water sorption in pure components and binary blends of high barrier ethylene-vinyl alcohol copolymer and amorphous polyamide and nylon-containin gionomer[J].Polymer,2001,42(23):9 531-9 540.
[13]邹盛欧.功能性包装材料[J].塑料科技,1999(1):41-45.
[14]葛铁军,李英明,杨雪.PBS/EVOH共混材料的阻透性能研究[J].塑料科技,2013,41(11):46-49.
[15]Schott H.Solubility parameter,specific molar cohesion,and the solubility of ethylene oxide in polymers[J].Biomaterials,1982,3(4):195-198.
[16]呼和,梁晓红,王羽,等.EHA/PE薄膜的阻隔性及其在冷鲜肉包装中的应用[J].塑料工业,2015,43(6):66-69.
[17]李泽江.EVOH树脂的性能、生产工艺及国内外市场分析[J].塑料工业,2011,39(2):1-4,9.