Remarkable characteristics and distinct community of biofilms on the photoaged polyethylene films in Riverine microcosms

2021 ◽  
pp. 118485
Author(s):  
Hexinyue Huang ◽  
Peng Liu ◽  
Yanqi Shi ◽  
Xiaowei Wu ◽  
Shixiang Gao
Keyword(s):  
Polyethylene Films

The analysis of “Gels” in polymer films

1989 ◽  
Vol 47 ◽  
pp. 362-363
Author(s):  
G. M. Brown ◽  
D. F. Brown ◽  
J. H. Butler
Keyword(s):  
Molecular Weight ◽  
Film Industry ◽  
Local Stress ◽  
Melt Index ◽  
Polyethylene Films ◽  
Crosslinked Polymer ◽  
Polymeric Gels ◽  
Mineral Particles ◽  
Polymeric Species ◽  
Special Concern

The term “gel”, in the jargon of the plastics film industry, may refer to any inclusion that produces a visible artifact in a polymeric film. Although they can occur in any plastic product, gels are a principle concern in films where they detract from the cosmetic appearance of the product and may compromise its mechanical strength by acting as local stress concentrators. Many film gels are small spheres or ellipsoids less than one millimeter in diameter whereas other gels are fusiform-shaped and may reach several centimeters in length. The actual composition of gel inclusions may vary from miscellaneous inorganics (i.e. glass and mineral particles) and processing additives to heavily oxidized, charred or crosslinked polymer. The most commonly observed gels contain polymer differing from the bulk of the sample in its melt viscosity, density or molecular weight.Polymeric gels are a special concern in polyethylene films. Over the years and with the examination of a variety of these samples three predominant polymeric species have been observed: density gels which have different crystallinity than the film; melt-index gels in which the molecular weight is different than the film and crosslinked gels which are comprised of crosslinked polyethylene.

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

Temperature-Responsive Surface-Functionalized Polyethylene Films

1997 ◽  
Vol 9 (2) ◽  
pp. 472-477 ◽  
Author(s):  
David E. Bergbreiter ◽  
Bill C. Ponder ◽  
Gaston Aguilar ◽  
B. Srinivas
Keyword(s):  
Polyethylene Films ◽  
Temperature Responsive

Coating-Activation and Antimicrobial Efficacy of Different Polyethylene Films with a Nisin-Based Solution

2012 ◽  
Vol 6 (10) ◽  
pp. 2770-2779 ◽  
Author(s):  
Antonietta La Storia ◽  
Gianluigi Mauriello ◽  
Francesco Villani ◽  
Danilo Ercolini
Keyword(s):  
Antimicrobial Efficacy ◽  
Polyethylene Films

Thermodynamics of the absorption of hydrocarbon vapors in polyethylene films

1987 ◽  
Vol 31 (2-3) ◽  
pp. 235-248 ◽  
Author(s):  
E.F. Castro ◽  
E.E. Gonzo ◽  
J.C. Gottifredi
Keyword(s):  
Polyethylene Films

Characteristics of Polyethylene Thin Films Deposited by Ionized Cluster Beam

1987 ◽  
Vol 108 ◽  
Author(s):  
Hiroaki Usui ◽  
Kouji Numata ◽  
Hitoshi Dohmoto ◽  
Isao Yamada ◽  
Toshinori Takagi
Keyword(s):  
Thin Films ◽  
Chemical Structure ◽  
Field Measurements ◽  
Breakdown Field ◽  
Cluster Beam ◽  
Electrical Insulator ◽  
Polyethylene Films ◽  
Interface Property ◽  
Stable Chemical ◽  
Film Substrate

ABSTRACTPolyethylene thin films were deposited by the ionized cluster beam (ICB) method. The dielectric, resistivity, and breakdown field measurements showed that the ICB polyethylene films have excellent properties as an electrical insulator. The characteristics of Au/polyethylene/Si MIS diodes and MISFErs indicated that the ICB method can control the film-substrate interface property. The SIMS and ESCAan alyses showed that the ICB films have pure and stable chemical structure.

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