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Effects of Si/Al,Na/Al and H_(2)O/Na_(2)O molar ratios on formaldehyde barrier properties of inorganic aluminosilicate coatings

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International Journal of Minerals,Metallurgy and Materials 2021年第11期28卷 1868-1874页

作者： Shan-xia Xiong Jian-lei Kuang Qian-fang Zheng Ting Xiao Wen-xiu Liu Qi Wang Peng Jiang Wen-bin Cao Department of Inorganic Nonmetallic Materials School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Wood-based panels containing urea-formaldehyde resin result in the long-term release of formaldehyde and threaten human *** this study,inorganic aluminosilicate coatings prepared by combining metakaolin,silica fume,NaOH,and H_(2)O were applied to the surfaces of wood-based panels to obstruct formaldehyde *** Si/Al,Na/Al,and H_(2)O/Na_(2)O molar ratios of the coatings were regulated to investigate their effects on the structure and formaldehyde-resistant barrier properties of *** showed that the cracks in the coatings gradually disappeared and the formaldehyde resistance rates of the barrier increased as the Si/Al molar ratio was increased from 1.6 to *** value also increased as the Na/Al molar ratio was increased from 0.9 to 1.2 because of the improvement of the degree of *** the H_(2)O/Na_(2)O molar ratio was increased from 12 to 15,the thickness of the dry film decreased gradually and led to the reduction in the formaldehyde resistance *** the Si/Al,Na/Al,and H_(2)O/Na_(2)O molar ratios were 2.2,1.2,and 12,respectively,the inorganic aluminosilicate coating showed good performance as a formaldehyde-resistant barrier and its formaldehyde resistance rate could reach up to 83.2%.

关键词： aluminosilicate coating chemical composition formaldehyde barrier properties

The influence of the structures and compounds of DLC coatings on the barrier properties of PET bottles

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Chinese Physics B 2009年第12期18卷 5401-5405页

作者：杨莉王正铎张受业杨丽珍陈强 Laboratory of Plasma Physics and Materials Beijing Institute of Graphic Communication

To reduce the oxygen transmission rate through a polyethylene terephthalate （PET） bottle （an organic plastic） diamond-like carbon （DLC） coatings on the inner surface of the PET bottle were deposited by radio frequency plasmaenhanced chemical vapour deposition （RF-PECVD） technology with C2H2 as the source of carbon and Ar as the diluted gas. As the barrier layer to humidity and gas permeation, this paper analyses the DLC film structure, composition, morphology and barrier properties by Fourier transform infrared, atomic force microscopy, scanning electron microscopy and oxygen transmission rate in detail. From the spectrum, it is found that the DLC film mainly consists of sp3 bonds. The barrier property of the films is significantly relevant to the sp3 bond concentration in the coating, the film thickness and morphology. Additionally, it is found that DLC film deposited in an inductively coupled plasma enhanced capacitively coupled plasma source shows a compact, homogeneous and crack-free surface, which is beneficial for a good gas barrier property in PET bottles.

关键词： diamond-like carbon film barrier properties

Study on the barrier properties and antibacterial properties of cellulose-based multilayer coated paperboard used for fast food packaging

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Food Bioscience 2022年第2期46卷 138-147页

作者： Fei-jie Wang Li-qiang Wang Xin-chang Zhang Shu-feng Ma Zhi-cheng Zhao Jiangsu Provincial Key Laboratory of Food Advanced Manufacturing Equipment Technology School of Mechanical EngineeringJiangnan UniversityWuxi214122China School of Food Science and Technology Jiangnan UniversityWuxi214122China ss College of Textile Science and Engineering Jiangnan UniversityWuxi214122China

Some petroleum-based packaging materials have a series of safety issues,and as a result,people are more inclined to use biodegradable and nontoxic packaging materials for ***,biodegradable alternatives often need to be modified to overcome their own *** this paper,carboxymethyl chitosan(CMCS)/carboxymethyl cellulose sodium(CMC)+polylactic acid(PLA)nano zinc oxide(ZnO)nanoparticles(CMCS/CMC+PLA/ZnO NPs)multilayer coated paperboard was prepared to explore its potential use in food package *** multilayer CMCS/CMC+PLA coating reduced the oxygen transmission rate by 99%and doubled the barrier properties for soybean oil penetration and water vapor compared with a single PLA coating layer in a 23℃/50 RH *** oil resistance time of the multilayer CMCS/CMC+PLA coating also increased 28 times,and the water vapor barrier properties increased twofold compared to a single CMCS/CMC coating *** water vapor barrier properties increased by a factor of 3 even at 38℃/90 *** with the CMCS/CMC+PLA coating without nanoparticles,the barrier performance of the CMCS/CMC+PLA/ZnO NPs coating was further *** oxygen,water vapor,and heptane vapor barrier properties all doubled,and the oil resistance time reached 235 *** a corona treatment reduced the polar component content in the CMCS/CMC coating and led to a slight decrease in the barrier properties of the coating to heptane,it was still a good oil-repellent coating *** antibacterial activity(A)toward Escherichia coli and Staphylococcus aureus exceeded 2,which meant that the multilayer coating with 1.5%added ZnO NPs reduced the growth of bacteria by more than 99%.The multilayer coated paperboard created here with the blended and modified materials significantly improved the barrier and antibacterial properties,suggesting that multilayer coatings prepared from degradable materials have good commercial prospects as fast food packaging.

关键词： Carboxymethyl chitosan Polylactic acid Multilayer coating barrier properties Antibacterial properties

Different Kinds of Microfibrillated Cellulose as Coating Layers Providing Fiber-based barrier properties

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Paper And Biomaterials 2021年第1期6卷 33-40页

作者： Ruijuan Zhang Yanqun Su Jingang Liu China National Pulp and Paper Research Institute Co. Ltd.Beijing100102China National Engineering Lab for Pulp and Paper Beijing100102China

In this study,we investigated the barrier properties of different kinds of microfibrillated cellulose(MFC)coating *** air,oxygen,and water vapor permeability,as well as the water contact angles(WCA),were measured to quantify the barrier efficacy of the applied *** WCA data showed that the surfaces of MFC-coated cardboards are more hydrophilic than those of uncoated ***,different MFC coatings realize different oxygen transmission rates(OTRs)and water vapor transmission rates(WVTRs).The MFC coating derived from bleached bamboo pulp subjected to carboxyethylation pretreatment(MFCCBP)gave the best oxygen and water vapor barrier *** OTR of the virgin cardboard(>16500 cm^(3)/(m^(2)·24 h))decreased to 4638 cm^(3)/(m^(2)·24 h)after coating with the *** WVTR similarly decreased from 1016.7 g/(m^(2)·24 h)to 603.2 g/(m^(2)·24 h).

关键词： microfibrillated cellulose coating performance surface properties barrier properties

Silica-Based Nanocoating Doped by Layered Double Hydroxides to Enhance the Paperboard barrier properties

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World Journal of Nano Science and Engineering 2015年第4期5卷 126-139页

作者： Vania M.Dias Alena Kuznetsova Joao Tedim Aleksey A.Yaremchenko Mikhail L.Zheludkevich Inês Portugal Dmitry V.Evtuguin CICECO/Department of Chemistry University of AveiroAveiroPortugal CICECO/Department of Materials and Ceramic Engineering University of AveiroAveiroPortugal

Paperboard is an environment-friendly multi-layer material widely used for packaging applications. However, for food packaging paperboard lacks essential barrier properties towards oxygen and water vapor. Conventional solutions to enhance these barrier properties (e.g. paperboard film coating with synthetic polymers) require special manufacturing facilities and difficult the end-of-life disposal and recycling of the paperboard. Paperboard coating with silica-based formulations is an eco-friendly alternative hereby disclosed. Silica-nanocoatings were prepared by sol-gel synthesis, with or without the addition of Zn(2)-Al-NO3 layered double hydroxides (LDHs), and applied on the surface (ca 2 g/m2) of industrial paperboard samples by a roll-to-roll technique. The physicochemical features of silica-nanocoatings were studied by FTIR-ATR, SEM/EDS, XRD analysis and surface energy measurements. The barrier properties of uncoated and silica-coated paperboard were accessed by water vapor transmission rate (WVTR) and oxygen permeability (Jo2) measurements. The best barrier results were obtained for paperboard coated with a mixture of tetraethoxysilane (TEOS) and 3-aminopropyltriethoxysilane (APTES), with and without the incorporation of LDHs.

关键词： Paperboard Silica-Based Formulations Layered Double Hydroxides Sol-Gel Synthesis barrier properties

Development and Physical properties of Film of Wheat Gluten Cross-linked by Transglutaminase

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Journal of Wuhan University of Technology(Materials Science) 2005年第1期20卷 78-82页

作者：王金水 College of Food and Bioengineering South China University of TechnologyGuang zhou 510641China The Faculty of Food Engineering Henan University of TechnologyZhengzhou 450052China

Films were developed from the modified wheat glutens by microbial transglutamina se(MTGase, [E/S]=10u/g,15u/g and 20u/g) in order to improve physical and barri er properties of the *** was used as a *** films prepared from the modified-glutens by MTGase show a lower elongation at break(E) and a water vapor permeability(WVP), and a higher tensile strength(TS) than the nati ve gluten *** the modified gluten films by different concentrations of MT Gase are immersed in water at 25℃,their weight losses decreased significantly, and their water resistance increases obviously as expected, compared with the c ontrol gluten films. Moreover, an addition of glycerol as plasticizer greatly mo dified water vapor barrier and mechanical properties of the films.

关键词： wheat gluten microbial transglutaminase barrier properties tensile strengt h elongation at break

A Potential Alternative to Polystyrene: Ring-opening Terpolymerization of Different Epoxides with Phthalic Anhydride Using Metal-free Dual Catalysts

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Chinese Journal of Polymer Science 2021年第3期39卷 337-343,I0006页

作者： Li-Miao Lin Yong-Hang Xu Man Shen Jia-Xin Liang Shuan-Jin Wang Min Xiao Yue-Zhong Meng The Key Laboratory of Low-carbon Chemistry&Energy Conservation of Guangdong Province/State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China School of Environmental and Chemical Engineering Foshan UniversityFoshan 528000China School of Materials Science&Energy Engineering Foshan UniversityFoshan 528000China

A series of semi-aromatic polyesters named as Poly(PO-CHO-PA) were facilely synthesized via ring-opening terpolymerization of biobased cyclohexane oxide(CHO)/propylene oxide(PO)/phthalic anhydride(PA) using economical U1/PPNCl as dual catalyst. The proportion of CHO-PA and PO-PA segments in polymer can be readily altered by changing the feed ratio of CHO/PO because the reactivity ratios of CHO and PO with PA calculated by Fineman-Ross method are comparable. All synthesized amorphous polyesters with various compositions show one Tg ranging from 62 ℃ to 133 ℃. Significantly, the mechanical, thermal and barrier properties of these amorphous semi-aromatic polyesters are also adjustable and investigated for the first time. The results indicate the semi-polyesters exhibit superior thermostability(T5% ranging from 306 ℃ to323 ℃) and high tensile strength(40.21-55.7 MPa) that is comparable with polystyrene(PS). Furthermore, Poly(PO-CHO-PA) films possess a promising prospect as packaging materials because of its colorless and highly transparent nature, along with low oxygen and water vapor transmission rate. All above performances may guarantee its potential alternative to commercial PS.

关键词： Aromatic polyester Ring-opening polymerization Metal-free catalyst Polystyrene barrier properties

Investigation of Microwave Surface-Wave Plasma Deposited SiO_x Coatings on Polymeric Substrates

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Plasma Science and Technology 2014年第1期16卷 37-40页

作者：王欢杨丽珍陈强 Laboratory of Plasma Physics and Materials Beijing Institute of Graphic Communication

In this paper, we reported nano-scale SiOx coatings deposited on polyethylene terephthalate （PET） webs by microwave surface-wave assisted plasma enhanced chemical vapor deposition for the purpose of improving their barrier properties. Oxygen （O2） and hexamethyl- disiloxane （HMDSO） were employed as oxidant gas and Si monomer during SiOx deposition, re- spectively. Analysis by Fourier transform infrared spectroscope （FTIR） for chemical structure and observation by atomic force microscopy （AFM） for surface morphology of SiO~ coatings demon- strated that both chemical compounds and surface feature of coatings have a remarkable influence on the coating barrier properties. It is noted that the processing parameters play a critical role in the barrier properties of coatings. After optimization of the SiOx coatings deposition conditions, i.e. the discharge power of 1500 W, 2 ： 1 of O2 ： HMDSO ratio and working pressure of 20 Pa, a better barrier property was achieved in this work.

关键词： silicon oxide barrier properties microwave surface wave PET

Formulation and Characterization of Film Based on Gum Exudates from Brea Tree （Cercidium praecox）

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Journal of Food Science and Engineering 2013年第3期3卷 113-122页

作者： Marfa A. Bertuzzi Anibal M. Slavutsky Instituto de Investigaciones para la Industria Quimica (CONICET) CIUNSa Facultad de lngenieria Universidad Nacional deSalta Salta A4408FVY Argentina Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT) Instituto de Investigaciones para la Industria Quimica(CONICET) C1UNSa Universidad Naeional de Salta Salta A4408FVY Argentina

In the present study, films and coatings for food applications based on a gum exudate from Brea tree （Cercidium praecox） were formulated and the influence of plasticizer content on their functional properties was evaluated. Brea gum is a renewable resource available in semi-desert areas, extracted by native people. Films were produced by casting method and characterized through water vapour permeability, mechanical （tensile strength and elongation at break）, morphological and optical properties. Glycerol was used as plasticizer. Brea gum films presented good visual aspect, transparency and amber colour. Microscopic observation showed a dense and homogeneous structure. Film wettability increased with glycerol content due to hydrophilic nature of the plasticizer. Solubility of films in water increased with temperature. Water sorption isotherms of films at 25 ~C showed that at high aw （above 0.50）, the film matrix swells altering its structure and properties. Water vapour permeability remained practically constant up to 20% of glycerol content and then increases linearly with the plasticizer. The addition of glycerol decreased the opacity and tensile strength. The best film properties were obtained at 20% of glycerol concentration.

关键词： Films brea gum mechanical properties barrier properties plasticizer effects