采用硅烷偶联剂KH791修饰硅藻土并与低密度聚乙烯(LDPE)基材共混,制备了氨基化硅藻土/LDPE薄膜,通过扫描电子显微镜、傅里叶变换红外光谱仪、热重分析仪对薄膜的形貌、结构和热性能进行了表征,研究了氨基化硅藻土添加比例对薄膜CO2、O2选择性渗透特性的影响。结果表明,硅烷偶联剂KH791的“分子桥”结构,能在硅藻土表面固定—NH2和—NH等基团,并以此提高CO2/O2选择性渗透、硅藻土在基膜中的分散性;随着氨基化硅藻土添加量的增加,薄膜水蒸气渗透系数、CO2气体渗透系数均随之增加;与LDPE膜相比,添加质量分数3%氨基化硅藻土的薄膜其CO2/O2选择性渗透比提升了154.9%,显示了其在果蔬气调包装中的应用潜力。
Diatomite was modified with silane coupling agent KH791 and blended with low-density polyethylene (LDPE) to prepare aminated diatomite/LDPE films.The morphology,structure,and thermal properties of the films were characterized using scanning electron microscopy (SEM),Fourier transform infrared spectroscopy (FT-IR),and thermogravimetric analysis (TGA).The effect of aminated diatomite content on the CO2/O2 selective permeability of the films was investigated.Results showed that the “molecular bridge” structure of KH791 effectively anchored —NH2 and —NH groups on the diatomite surface,enhancing CO2/O2 selective permeability and improving diatomite dispersion in the matrix.Increasing the aminated diatomite content raised both the water vapor permeability and CO2 permeability of the films.Compared to LDPE film,the CO2/O2 selectivity of the film with 3 wt% aminated diatomite increased by 154.9%,demonstrating its potential for modified atmosphere packaging of fruits and vegetables.
[1] Paulsen E,Barrios S,Bogdanoff N,et al.Recent progress in modified atmosphere packaging and biopolymeric films and coatings for fresh strawberry shelf-life extension[J].Packaging Technology and Science,2024,37(7):619-640.
[2] Qu P,Zhang M,Fan K,et al.Microporous modified atmosphere packaging to extend shelf life of fresh foods:a review[J].Critical Reviews in Food Science and Nutrition,2022,62(1):51-65.
[3] 万哲.基于聚乙烯醇/二乙醇胺的LDPE选择性渗透膜制备与性能研究[D].无锡:江南大学,2017.
[4] Genduso G,Ogieglo W,Wang Y,et al.Carbon molecular sieve gas separation materials and membranes:a comprehensive review[J].Journal of Membrane Science,2024,699:122533.
[5] Shafiee M,Akbari A,Foroutan R,et al.The permeability and selectivity of nanocomposite membrane of PEBAx 1657/PEI/SiO2 for separation of CO2,N2,O2,CH4 gases:a data set[J].Data in Brief,2020,28:104800.
[6] Teesdale J J,Lee M,Lu R,et al.Uncertainty in composite membranes:from defect engineering to film processing[J].Journal of the American Chemical Society,2022,145(2):830-840.
[7] Ashtiani S,Sofer Z,Průša F,et al.Molecular-level fabrication of highly selective composite ZIF-8-CNT-PDMS membranes for effective CO2/N2,CO2/H2 and olefin/paraffin separations[J].Separation and Purification Technology,2021,274:119003.
[8] Xu H,Feng W,Sheng M,et al.Covalent organic frameworks-incorporated thin film composite membranes prepared by interfacial polymerization for efficient CO2 separation[J].Chinese Journal of Chemical Engineering,2022,43:152-160.
[9] Xiang L,Sheng L,Wang C,et al.Amino-functionalized ZIF-7 nanocrystals:improved intrinsic separation ability and interfacial compatibility in mixed-matrix membranes for CO2/CH4 separation[J].Advanced Materials,2017,29(32):1606999.
[10] Deka D J,Biswas C,Paul R,et al.Harmonizing between che-mical functionality and surface area of porous organic polymeric nanotraps for tuning carbon dioxide capture[J].Chemistry-An Asian Journal,2024,19(18):202400515.
[11] Jia J,Song H,Jia P,et al.Adsorption mechanism of CO2/CH4/N2 by the synergistic effect of N/S-doped and functional groups in coal at different temperatures and pressures[J].Arabian Journal of Chemistry,2023,16(12):105333.
[12] Zhao Y,Qiu X,Wang J,et al.Preparation and characterization of CO2/O2 selective facilitated transport films by coating po-lyvinyl alcohol/polyethylene glycol/aminated sodium lignosulfonate on TiO2/ZnO-modified LDPE[J].Journal of Applied Polymer Science,2023,140(21):53877.
[13] 徐庭巧,魏云潇,王毅,等.纳米碳酸钙改性聚乙烯膜对杨梅贮藏品质和生理的影响[J].现代食品科技,2016(10):205-210.
[14] 王宇.新型聚乙烯气调包装薄膜的制备及性能研究[D].上海:东华大学,2022.
[15] Lamastra F R,Mori S,Cherubini V,et al.A new green methodology for surface modification of diatomite filler in elastomers[J].Materials Chemistry and Physics,2017,194:253-260.
[16] Guo S,Luo S,Li X,et al.Effect of silica nanospheres silanized by functional silanes on the physicochemical and mechanical properties of bis-GMA/TEGDMA dental composite resin by photocuring synthesis[J].International Journal of Adhesion and Adhesives,2024,132:103724.
[17] Zheng W,Tang C,Xie J,et al.Micro-scale effects of nano-SiO2 modification with silane coupling agents on the cellulose/nano-SiO2 interface[J].Nanotechnology,2019,30(44):445701.
[18] Huang C,Huang Z,Lv X,et al.Surface modification of hollow glass microsphere with different coupling agents for potential applications in phenolic syntactic foams[J].Journal of Applied Polymer Science,2017,134(4):44415.
[19] Jeong S,Yoo S.Preparation and properties of sodium bicarbonate-incorporated LDPE films with deodorizing function for kimchi packaging[J].Packaging Technology and Science,2017,30(12):781-790.
[20] Fan W,Wang J,Li Z.Antiglare waterborne polyurethane/modified silica nanocomposite with balanced comprehensive properties[J].Polymer Testing,2021,99:107072.
[21] Wang H,Xu J,Wang H,et al.Mechanically robust and self-healing waterborne polyurethane nanocomposites based on inorganic organic hybrid materials and reversible covalent interaction[J].Polymer Engineering & Science,2022,62(3):694-704.
[22] Dammak I,Sobral P J A.Active gelatin films incorporated with eugenol nanoemulsions:effect of emulsifier type on films properties[J].International Journal of Food Science & Technology,2019,54(9):2725-2735.
[23] 陈明.LDPE薄膜料的结构与性能研究[D].兰州:西北师范大学,2015.
[24] 苏英杰.纳米埃洛石负载香芹酚气相缓释抗菌抗氧化包装膜制备[D].无锡:江南大学,2021.
[25] Yang J,Zhou Z,Lu P,et al.Leaf porous structure inspired packaging film for fruits preservation and monitoring CO2 concentration of package[J].Chemical Engineering Journal,2023,464:142660.
[26] 陈方正,崔万祥,庄林家,等.聚乙烯亚胺改性聚酰胺反渗透膜的CO2/N2分离性能[J].膜科学与技术,2024,44(4):130-139.
[27] Cussler E L,Aris R,Bhown A.On the limits of facilitated diffusion[J].Journal of Membrane Science,1989,43(2/3):149-164.
基金资助
国家重点研发计划资助项目(2018YFC1603200)
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