scholarly journals Physical and gas permeation properties of five-layer polyethylene film used as greenhouse roof

2018 ◽  
Vol 49 (2) ◽  
pp. 124-129
Author(s):  
Abdelkader Dehbi ◽  
Boulos Youssef ◽  
Abdel-Hamid I. Mourad ◽  
Corinne Chappey ◽  
Pietro Picuno ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Fourier Transform ◽  
Surface Morphology ◽  
Vinyl Acetate ◽  
Significant Influence ◽  
Experimental Analysis ◽  
Gas Permeation ◽  
Air Bubble ◽  
Permeation Properties

The effect of sand wind ageing simulation performed under different conditions for a five-layer film consisting of polyethylene, poly-vinyl-acetate and various additives has been investigated. The mechanical properties of the five-layer films after several treatments were evaluated, together with their surface morphology - analysed by using Fourier transform infrared and contact angle - and gas permeation properties. The experimental analysis indicated that these treatments had a significant influence on the surface of the film only. An attempt has been done to compare the properties of the five-layer films with the monolayer and tri-layer films with or without air bubble under similar conditions.

Effects of preparation conditions on the morphology and gas permeation properties of polyethylene (PE) and ethylene vinyl acetate (EVA) films

2010 ◽  
Vol 88 (12) ◽  
pp. 1593-1598 ◽  
Author(s):  
Seyyed Abbas Mousavi ◽  
Morteza Gholizadeh ◽  
Saeid Sedghi ◽  
Mahdi Pourafshari-Chenar ◽  
Molood Barmala ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Gas Permeation ◽  
Preparation Conditions ◽  
Permeation Properties

scholarly journals Multilayers Polyethylene Film for Crop Protection in Harsh Climatic Conditions

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
A. Dehbi ◽  
B. Youssef ◽  
C. Chappey ◽  
A.-H. I. Mourad ◽  
P. Picuno ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Tensile Test ◽  
Optical Microscopy ◽  
Significant Influence ◽  
Crop Protection ◽  
Thermal Characteristics ◽  
Climatic Conditions ◽  
Layer Film ◽  
Air Bubble ◽  
New Generation

In this work the performance and durability of a new generation of greenhouse covers, in which the cover is composed of five layers, are investigated. A sand wind ageing was performed under different exposure conditions. Surface morphology and chemical, physical, and thermal characteristics were investigated by using optical microscopy, FTIR, and tensile test techniques. In addition, the mechanical integrity of the five-layer film was assessed. The analysis indicated that the sand wind treatments have a significant influence only on the performance of the film. An attempt has been done to compare the properties of the five-layer film with the monolayer and trilayer films with or without air bubble under similar conditions. The results revealed that the five-layer film proved to be a promising greenhouse covering film.

Gas permeation properties of ethylene vinyl acetate–silica nanocomposite membranes

2008 ◽  
Vol 322 (2) ◽  
pp. 423-428 ◽  
Author(s):  
Morteza Sadeghi ◽  
Ghader Khanbabaei ◽  
Amir H. Saeedi Dehaghani ◽  
Mohammad Sadeghi ◽  
Mohammad A. Aravand ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Gas Permeation ◽  
Nanocomposite Membranes ◽  
Silica Nanocomposite ◽  
Permeation Properties

scholarly journals Consolidation of Fir Wood by Poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate) Treatment: Study of Surface and Mechanical Characteristics

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1039
Author(s):  
Danial Harandi ◽  
Javier González-Benito ◽  
Dania Olmos
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Vinyl Acetate ◽  
Vinyl Alcohol ◽  
Untreated Wood ◽  
Hydrophobic Surface ◽  
Solution Concentration ◽  
Bending Test ◽  
Water Contact ◽  
Vinyl Butyral

The ability of poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate) (PVBVA) to consolidate Fir wood was studied in terms of the surface and mechanical properties’ changes. Two variables were considered to treat the wood: (i) the concentration (5 and 10 wt.%) of PVBVA solutions and (ii) the method of application (brushing and immersion). The presence of PVBVA on the wood surfaces was confirmed by infrared spectroscopy. Surface roughness measured by optical profilometry did not reveal changes in the topography of the samples, and appropriate visual appearance was confirmed. Contact angle measurements showed that a droplet of the 10%-PVBVA solution needed ~50 s to reach the same contact angle decreasing rate as that measured for the 5%-PVBVA solution, suggesting there was some kind of induction time till the spreading process was no longer controlled by the viscosity, but by the solution-wood interactions. Water contact angle (WCA) measurements proved a more hydrophobic surface of the PVBVA-treated samples, compared to untreated wood. Mechanical characterization of the samples was done macroscopically by a three-point bending test and locally by the Shore D and Martens hardness (MH). Only results from MH experiments provided comparative results, indicating that treatment with PVBVA solutions increased wood hardness locally, being enhanced with solution concentration. The best surface mechanical properties were obtained for the samples immersed in the 10%-PVBVA solution.

Influence of Degumming Methods on Mechanical Properties of Silk and CODcr of Wastewater

2011 ◽  
Vol 332-334 ◽  
pp. 183-187
Author(s):  
Xue Dong ◽  
Tie Ling Xing ◽  
Guo Qiang Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Secondary Structure ◽  
Surface Morphology ◽  
Sodium Carbonate ◽  
Molecular Conformation ◽  
Silk Fibers ◽  
Silk Sericin

Silk fibers was degummed by different methods: sodium carbonate, neutral soap, tartaric acid, 2709 alkaline proteinase and hot pressurized water.The physical properties and secondary structure of silk and the CODcr of degumming wastewater were investigated to elucidate the effects after different degumming treatment.The results showed that the silk sericin was almost removed completely through various degumming methods, the degumming effects on silk including the appearance, the mechanical properties and the CODcr of degumming wastewater were different. Compared with five degumming methods, the surface morphology of degummed silk fiber was very smooth and fine, except hot pressurized water.The tensile strength of silk fibers degummed by all of the methods was decreased to some excent. The molecular conformation estimated by Fourier transform infrared spectroscopy stayed unchanged regardless of different degumming methods. The CODcr of wastewater degummed with different methods showed obvious difference, soap degumming wastewater was much higher than that of sodium carbonate degumming wastewater.

Preparation and Characterization of Polyethylene/Ethylene Vinyl Acetate Composite Non-Dropping Greenhouse Film

2012 ◽  
Vol 724 ◽  
pp. 237-240 ◽  
Author(s):  
Jia Cheng Wei ◽  
Xue Gang Luo ◽  
Xiao Yan Lin ◽  
Hong Ping Zhang
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Vinyl Acetate ◽  
Testing Machine ◽  
Ethylene Vinyl Acetate ◽  
Elongation At Break ◽  
Atomic Force ◽  
Acceleration Method ◽  
The Impact

For the problem it is easy for the film to generate fog and drop in greenhouse, Polyethylene/Ethylene Vinyl Acetate (PE/EVA) composite greenhouse film was prepared by co-blending and extrusion. The impact of preparation parameters and the dosage of anti-fogging and anti-dropping masterbatch on the mechanical properties and non-dropping properties of the film has been investigated by versatile mechanical testing machine, atomic force microscope (AFM), contact angle tester, water bath acceleration method. The results show that the elongation at break and tensile strength of the composite film, contact angle of water and the film have decreased after added the anti-fogging and anti-dropping masterbatch. The addition of the anti-fogging and anti-dropping masterbatch can increase the non-dropping property of the greenhouse film greatly.

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