scholarly journals Estimation of protective ability, physical and mechanical properties of polymer inhibited films

2019 ◽  
Vol 75 (5) ◽  
pp. 601-606
Author(s):  
L. G. Kolyada ◽  
E. V. Tarasyuk ◽  
A. P. Ponomarev
Keyword(s):  
Polymer Film ◽  
Physical And Mechanical Properties ◽  
Polyethylene Film ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Polyethylene Matrix ◽  
Polyethylene Films ◽  
Volatile Inhibitor ◽  
Volatile Inhibitors ◽  
Metal Products

Metal products are subjected to atmosphere corrosion during transporting and longtime storing. Utilization of packing materials eliminating the access of water vapor and aggressive gases to the metal products surface is an important ways of struggling against the corrosion. Among the methods of metal products protection against the corrosion, application of volatile inhibitors is one of most effective one. As a carrier of the volatile corrosion inhibitors, polyethylene films can be used. Study of strength and barrier properties of polyethylene films with a volatile corrosion inhibitor and without it accomplished. As an object of the study, the films, produced under laboratory conditions by extrusion with blowing of low-density polyethylene and mixture of low-density polyethylene and IFKhAN volatile inhibitor, developed by the Institute of Physical Chemistry (Academy of Sciences of RF). For accelerated corrosion tests, samples of 08пс cold rolled steel used. The prepared samples packed in the studied films, a part of the closed airtight, and another part – not compact. It was traced, that the samples packed in the polyethylene film without the volatile inhibitor, had a point corrosion. The airtight sealed polymer film casings protect the carbon steel much better, comparing with the not compact casings. The surface of samples corrosion worms, which were airtight packed, was 0.15%, not compact ones – 0.33%. When inhibited polymer film was used for not compact packing, the corrosion had a uniform character, no local corrosion worms (pitting) was observed. The corrosion products were spongy, weekly cohered with the basic metal, easily peeling off. During the test period, the samples airtight packed in polyethylene film, containing IFKhAN volatile inhibitors, had no areas of corrosion. It was found, that input of inhibitor into the polyethylene matrix results in decreasing the film strength properties due to formation structure defects at the sub-molecular level during the extrusion, and also as a result of inhibitor desorption.

Long- and short-term antibacterial properties of low-density polyethylene-based films coated with zinc oxide nanoparticles for potential use in food packaging

2019 ◽  
Vol 35 (2) ◽  
pp. 117-134 ◽  
Author(s):  
Hajer Rokbani ◽  
France Daigle ◽  
Abdellah Ajji
Keyword(s):  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Zinc Oxide Nanoparticles ◽  
Food Packaging ◽  
Antibacterial Properties ◽  
Polyethylene Film ◽  
Low Density Polyethylene ◽  
Oxide Nanoparticles ◽  
Low Density ◽  
Polyethylene Films

Concerns in food safety and the need for high-quality foods have increased the demand for extending the shelf life of packaged foods. Subsequently, promoting and investigating the development of antibacterial materials for food packaging has become inevitable. Zinc oxide nanoparticles have attracted attention lately owing to their multifunctional properties, especially antibacterial activity. For this study, antibacterial low-density polyethylene films were prepared by coating zinc oxide nanoparticles onto their surface. The low-density polyethylene film antibacterial activity was evaluated toward Gram-positive and Gram-negative bacteria. The scanning electron microscopy images showed that using anhydride-modified low-density polyethylene (LDPE-g-AM) resin permitted improved zinc oxide nanoparticle distribution on the low-density polyethylene film surface, reduced the agglomerate sizes, and reinforced the zinc oxide nanoparticle bonding to the low-density polyethylene film surface. We found that the coated low-density polyethylene films exhibited high antibacterial activity against both strains. The antibacterial tests also proved that the coated films retained their antibacterial efficiency toward Escherichia coli, even after eight months, with a reduction rate higher than 99.9%, whereas for Staphylococcus aureus the antibacterial properties for the linear low-density polyethylene (LLDPE) films decreased at eight months and improved for the LDPE-g-AM films. When the zinc oxide coated films were laminated with neat low-density polyethylene, only the LDPE-g-AM was still active against E. coli provided that the lamination thickness does not go beyond 8 µm. This research demonstrated that the coated low-density polyethylene films have excellent attributes when used as an active coating in the food packaging industry.

scholarly journals Low-Density Polyethylene Films Carrying ferula asafoetida Extract for Active Food Packaging: Thermal, Mechanical, Optical, Barrier, and Antifungal Properties

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Razieh Niazmand ◽  
Bibi Marzieh Razavizadeh ◽  
Farzaneh Sabbagh
Keyword(s):  
Polymer Matrix ◽  
Food Packaging ◽  
Barrier Properties ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Optical Barrier ◽  
Leaf Extracts ◽  
Polyethylene Films ◽  
Active Food Packaging ◽  
Ferula Asafoetida

The physical, thermal, mechanical, optical, microstructural, and barrier properties of low-density polyethylene films (LDPE) containing ferula asafoetida leaf and gum extracts were investigated. Results showed a reduction in elasticity and tensile strength with increasing extract concentration in the polymer matrix. The melting temperature and enthalpy increased with increasing concentration of extracts. The films containing extracts had lower L∗ and a∗ and higher b∗ indices. The films containing leaf extract had more barrier potential to UV than the gum extracts. The oxygen permeability in films containing 5% of leaf and gum extracts increased by 2.3 and 2.1 times, respectively. The morphology of the active films was similar to bubble swollen islands, which was more pronounced at higher concentrations of gum and leaf extracts. FTIR results confirmed some chemical interactions of ferula extracts with the polymer matrix. At the end of day 14th, the growth rate of Aspergillus niger and Saccharomyces cerevisea in the presence of the PE-Gum-5 reduced more than PE-Leaf-5 (3.7 and 2.4 logarithmic cycles, respectively) compared to the first day. Our findings showed that active LDPE films have desire thermo-mechanical and barrier properties for food packaging.

The use of recycled low‐density polyethylene films from protective prepreg for the development of nanocomposites with bentonite clay

2021 ◽  
pp. 50559
Author(s):  
Pamela Rodrigues Passos Severino ◽  
Natália Ferreira Braga ◽  
Guilherme Ferreira Morgado ◽  
Juliano Marini ◽  
Orestes Ferro ◽  
...  
Keyword(s):  
Bentonite Clay ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Polyethylene Films ◽  
Recycled Low Density Polyethylene

Physical and mechanical properties of linear low-density polyethylene/cycloolefin copolymer/layered silicate nanocomposite

2015 ◽  
Vol 37 (11) ◽  
pp. 3167-3174 ◽  
Author(s):  
S. Sánchez-Valdes ◽  
E. Ramírez-Vargas ◽  
L.F. Ramos de Valle ◽  
J.G. Martinez-Colunga ◽  
J. Romero-Garcia ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Layered Silicate ◽  
Physical And Mechanical Properties ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene

Physicomechanical, optical, barrier, and WAXS studies of filled linear low-density polyethylene films

2003 ◽  
Vol 90 (11) ◽  
pp. 2938-2944 ◽  
Author(s):  
Siddaramaiah ◽  
T. Jeevananda ◽  
K. S. Jagadeesh ◽  
H. Somashekarappa ◽  
R. Somashekar
Keyword(s):  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Optical Barrier ◽  
Polyethylene Films

Temperature Dependence of Degradation of Colored Oxo-Biodegradable Low-Density Polyethylene Films under Accelerated Thermal Aging

2017 ◽  
Vol 890 ◽  
pp. 82-85 ◽  
Author(s):  
Reymark D. Maalihan ◽  
Bryan B. Pajarito
Keyword(s):  
Thermal Aging ◽  
Degradation Products ◽  
Low Density Polyethylene ◽  
Effect Of Temperature ◽  
Low Density ◽  
Polyethylene Films ◽  
Hot Air ◽  
Taguchi Design Of Experiments ◽  
Oxidant Concentration ◽  
The Stability

This work reports the effect of temperature on degradation of colored low-density polyethylene (PE) films during thermal aging. Film samples were formulated according to Taguchi design of experiments where colorant, thickness, and pro-oxidant concentration were varied accordingly. Tensile properties of films were monitored with time during heat aging in a hot air oven at 50, 70, and 90 °C. Likewise, surfaces of aged films were analyzed to evaluate the degree of oxidation of PE during thermal aging. The Arrhenius equation was then used to predict the lifetime of PE at an in-use temperature of 30 °C. Results indicate that increasing the temperature reduces the tensile strength and modulus of films. Formation of carbonyl groups as degradation products is also observed at higher temperatures. Consequently, thermal aging at 90 °C offers the highest extent of degradation of exposed films. Regression analysis reveals that white films degrade at a higher rate than yellow and non-colored films. The presence of TiO2 in white films shortens the lifetime of PE while amine stabilizer in yellow films enhances the stability of PE during thermal aging.

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