Performance of multilayered LDPE films used as greenhouse cover in semiarid climate

2018 ◽  
Vol 51 (3) ◽  
pp. 211-223
Author(s):  
M Aouinet ◽  
K Djakhdane ◽  
A Dehbi ◽  
D Castronuovo ◽  
P Picuno
Keyword(s):  
Mechanical Properties ◽  
Climatic Conditions ◽  
Low Density Polyethylene ◽  
Cross Linking ◽  
Creep Recovery ◽  
Low Density ◽  
Monolayer Film ◽  
Polyethylene Films ◽  
Anisotropic Character ◽  
Better Than

The low-density polyethylene films used for greenhouse roof were naturally weathered for 9 months in harsh climatic conditions (Tiaret region, Algeria). The changes in the mechanical properties have been measured by tensile and creep-recovery tests. The measurements were carried out for both monolayer and tri-layer films. The anisotropic character of the films is preserved during ageing. The improvement in the creep resistance via cross-linking for both monolayer and tri-layer films affects different deformations. The results revealed that the degradation performance of these new tri-layer films is found to be quite better than that of the monolayer film, with regard to the mechanical properties.

Relationship between Tensile Modulus and Oxygen Uptake of Pro-Oxidant Loaded Low-Density Polyethylene Films during Heat Aging

2016 ◽  
Vol 705 ◽  
pp. 72-76 ◽  
Author(s):  
Reymark D. Maalihan ◽  
Bryan B. Pajarito
Keyword(s):  
Mechanical Properties ◽  
Oxygen Uptake ◽  
Tensile Modulus ◽  
Oxidation Products ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Weight Changes ◽  
Polyethylene Films ◽  
Taguchi Design Of Experiments ◽  
The Relationship

Polyethylene (PE) films with pro-oxidants are commonly used in agricultural and packaging industries due to their inherent biodegradability when initially expose to heat and/or light in the presence of oxygen. The degradation of films is characterized by formation of oxidation products, weight changes and loss of mechanical properties. This study investigated the relationship between tensile modulus and oxygen uptake of low-density PE films with pro-oxidants under thermal treatment at 50 and 70 °C. Blown-type films of varying colorants, thickness and pro-oxidant loading were formulated according to Taguchi design of experiments. Tensile modulus and oxygen uptake of thermally aged films were obtained from force-stroke curves and gravimetric tests, respectively. Results revealed that two out of nine formulated films showed tensile modulus to be significantly increasing with oxygen uptake at 50 °C. Correlation was more evident at 70 °C where seven out of nine formulations followed the same trend. The improvement in tensile modulus with oxygen uptake indicates increase in crystallinity of films during thermal aging. Increase in hydroxyl index of films with exposure time confirmed their degradation during heat aging. Consequently, concentration of carboxylic acids as major thermo-oxidation products was found higher at 70 °C of aging.

Characterization on Optical and Mechanical Properties of Low-Density Polyethylene Films Doped with Eu(III) Complex

2014 ◽  
Vol 895 ◽  
pp. 162-168
Author(s):  
Mohd Nasha’ain Nordin ◽  
Nik Mohd Azmi ◽  
Hasrina Hashim ◽  
Ahmad Makarimi Abdullah ◽  
Wedianti Shualdi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Test ◽  
Chemical Properties ◽  
Extrusion Process ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Polyethylene Films ◽  
Ftir Characterization ◽  
Optical And Mechanical Properties ◽  
Doping Ratio

Low-Density Polyethylene films of 100 μm thickness doped with Eu (TTA)3phen complex was hot-blown by a lab scale extrusion process. The ratio of the complex was varied from 0%, 0.025%, 0.5%, 0.1%, to 0.2% with respect to the total weight of LDPE. The mechanical properties of the films were measured according to ASTM D882, and ASTM D1938 standards. The optical and chemical properties were characterized by spectrofluorometer and FTIR respectively. FTIR characterization shows that Eu (TTA)3phen in LDPE films does not exhibit spectrum due to the dominant nature of amorphous LDPE. All emission transition lines of Eu3+ion for doped films were observed when excited at 394 nm, and the highest peak was detected at 608 nm. The peak intensity reached a saturation level at 0.1% doping ratio, while mechanical test showed that the tensile strength (TS) and elongation at break (EB) of machine direction (MD) oriented films decreased with increasing ratio of the complex, in which at doping ratio of 0.2%, both values dropped by 17.8% and 11.6% respectively.. These results indicate that different doped ratio of Eu (TTA)3phen affect significantly the film properties which offer possibility for an improved photoselective greenhouse plastic films. Keywords; LDPE, Eu (TTA)3phen, Photoluminescence.

Effect of C60 fullerene additives on the mechanical properties of low-density polyethylene films

2008 ◽  
Vol 34 (1) ◽  
pp. 56-57 ◽  
Author(s):  
Sh. Tuichiev ◽  
S. Kh. Tabarov ◽  
Dzh. Rashidov ◽  
U. Shoimov ◽  
B. M. Ginzburg
Keyword(s):  
Mechanical Properties ◽  
Low Density Polyethylene ◽  
C60 Fullerene ◽  
Low Density ◽  
Polyethylene Films

Effect of irradiation on the mechanical properties of low-density polyethylene films

1973 ◽  
Vol 7 (1) ◽  
pp. 67-70 ◽  
Author(s):  
G. I. Glukhovskaya ◽  
A. V. Nikit-skii ◽  
V. S. Zhikharev ◽  
A. M. Kabakchi ◽  
A. I. Soshko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Polyethylene Films

Calcium Stearate and Alumina Trihydrate Addition of Irradiated LDPE, EVA and Blends with Electron Beam

2013 ◽  
Vol 290 ◽  
pp. 31-37 ◽  
Author(s):  
Maziyar Sabet ◽  
Mohd Syafiq Bin Anuwar
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Ethylene Vinyl Acetate ◽  
Calcium Stearate ◽  
Low Density Polyethylene ◽  
Cross Linking ◽  
Low Density ◽  
Irradiation Effects ◽  
Polymeric Blends ◽  
Alumina Trihydrate

Irradiation effects on the properties of alumina trihydrate (ATH) / low-density polyethylene (LDPE)/ ethylene vinyl acetate (EVA) / calcium stearate (CS) have been studied and confirmed that EVA and CS addition to the polymeric blends have improved the mechanical properties. ATH addition increased the cross-linking density and improved the blend reinforcing factor but deteriorated the blend mechanical properties. CS addition made ease the ATH dispersion inside polymer matrix. CS addition optimum value in blends was 3 phr and CS addition above 3 phr value deteriorated the blends mechanical properties.

Influence of Natural and Accelerated Weathering on the Mechanical Properties of Low-Density Polyethylene Films

2014 ◽  
Vol 19 (3) ◽  
pp. 189-203 ◽  
Author(s):  
Muhammad Abduh Tuasikal ◽  
Othman Y. Alothman ◽  
Mohammad Luqman ◽  
S. M. Al-Zahrani ◽  
M. Jawaid
Keyword(s):  
Mechanical Properties ◽  
Low Density Polyethylene ◽  
Accelerated Weathering ◽  
Low Density ◽  
Polyethylene Films

The behaviour of the oxo-biodegradable LDPE materials during the service life

2012 ◽  
Vol 23 (2) ◽  
pp. 187-190
Author(s):  
Corina Teodorescu ◽  
Lica Mitrana ◽  
Anca-Corina Teiu
Keyword(s):  
Mechanical Properties ◽  
Service Life ◽  
Polymer Films ◽  
Metal Content ◽  
Synthetic Polymer ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Soil Columns ◽  
Short Life ◽  
Polyethylene Films

AbstractThis is an experimental study on behaviour of oxo-biodegradable plastics containing additives during service life. Low density polyethylene is a most extensive used synthetic polymer with the largest production, because an important part of the production is converted into various products with short life cycle. The goal of this paper was to quantify the biodegradation of two low density polyethylene films containing 10% and 20% pro-oxidant AddiFlex in soil columns. Previously, the physical-mechanical properties and heavy metal content in polymer films have been determined. The obtained degree of mineralization was around 60% after 200 days of incubation for both studied polymer films (59.8% for 10% additive and 64.3% for 20% additive).

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