scholarly journals Influence of Plasticizers Over Some Physico-chemical Properties of PLA

2017 ◽  
Vol 54 (1) ◽  
pp. 73-78 ◽  
Author(s):  
Maria Rapa ◽  
Raluca Nicoleta Darie Nita ◽  
Cornelia Vasile
Keyword(s):  
Thermal Properties ◽  
Food Packaging ◽  
Chemical Properties ◽  
Melt Processing ◽  
Main Task ◽  
Mechanical And Thermal Properties ◽  
Oxygen Barrier ◽  
Physico Chemical ◽  
Different Types ◽  
Oxygen Barrier Property

The use of polylactic acid (PLA) for food packaging is limited because it has poor mechanical and thermal properties, low ductility, and its oxygen barrier property is quite poor compared with polymers obtained from petrochemical resources. One main task of processors is to modify these properties in such a way that PLA to be able to compete with conventional polymers such as polyethylene, polypropylene or poly(vinylchloride). Our studies were conducted to test the effect of different types of plasticizers on the PLA melt processing and also on its mechanical and thermal performance.

scholarly journals Reinforcement of Refined and Semi-Refined Carrageenan Film with Nanocellulose

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1145 ◽  
Author(s):  
Bakti B. Sedayu ◽  
Marlene J. Cran ◽  
Stephen W. Bigger
Keyword(s):  
Thin Film ◽  
Thermal Properties ◽  
Food Packaging ◽  
Lower Cost ◽  
Polymer Structure ◽  
Mechanical And Thermal Properties ◽  
Moisture Barrier ◽  
Water Sensitivity ◽  
Reinforced Polymer

Carrageenans obtained from seaweeds can be processed into films for a range of applications including food packaging. The level of carrageenan refinement during extraction can influence the key properties, with semi-refined carrageenan (SRC) containing more impurities than the more refined carrageenan (RC). Further refinement steps, however, result in higher costs associated with the production of RC. In order to obtain a lower cost and more ecofriendly, bio-based material for food packaging applications, SRC was used in this investigation to produce a thin film reinforced with nanocellulose fibrils (NCF). Films derived from RC containing NCF were also investigated with water sensitivity and physico-mechanical and thermal properties among the properties tested. Levels of NCF were varied from 1% to 7% (w/w), and in general, the NCF reinforcement improved the overall properties of both the SRC and RC films, including the water sensitivity and moisture barrier. However, NCF inclusion in SRC film was less effective with regard to the mechanical and thermal properties compared with NCF inclusion in RC film. The enhancement in properties was attributed to the greater cohesiveness of the reinforced polymer structure and the crystalline regions formed in the structures of SRC and RC films by NCF incorporation.

scholarly journals Optimization of Electrolysis Parameters for Green Sanitation Chemicals Production Using Response Surface Methodology

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 792
Author(s):  
Nurul Izzah Khalid ◽  
Nurul Shaqirah Sulaiman ◽  
Norashikin Ab Aziz ◽  
Farah Saleena Taip ◽  
Shafreeza Sobri ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Food Industry ◽  
Chemical Properties ◽  
Bactericidal Effect ◽  
Electrolyzed Water ◽  
Optimum Parameters ◽  
Physico Chemical ◽  
Different Types ◽  
Different Temperatures ◽  
Optimized Conditions

Electrolyzed water (EW) shows great potential as a green and economical sanitation solution for the food industry. However, only limited studies have investigated the optimum electrolysis parameters and the bactericidal effect of acidic electrolyzed water (AcEW) and alkaline electrolyzed water (AlEW). Here, the Box–Behnken experimental design was used to identify the optimum parameters. The tests were conducted with different types of electrodes, electrical voltages, electrolysis times, and NaCl concentrations. There were no obvious differences observed in the physico-chemical properties of EW when different electrodes were used. However, stainless steel was chosen as it meets most of the selection criteria. The best-optimized conditions for AcEW were at 11.39 V, 0.65 wt.% NaCl, and 7.23 min, while the best-optimized conditions for AlEW were at 10.32 V, 0.6 wt.% NaCl, and 7.49 min. The performance of the optimum EW (AcEW and AlEW) compared with commercial cleaning detergents for the food industry was then evaluated. The bactericidal activity of AcEW and AlEW was examined against Escherichia coli ATCC 10536 at different temperatures (30 °C and 50 °C) for 30 s. The results show that both AcEW and AlEW have the ability to reduce the Escherichia coli to non-detectable levels (less than 2 log CFU/mL).

scholarly journals The Utilization of Recycled Masonry Aggregate and Recycled EPS for Concrete Blocks for Mortarless Masonry

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1923 ◽  
Author(s):  
Tereza Pavlu ◽  
Kristina Fortova ◽  
Jakub Divis ◽  
Petr Hajek
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Masonry Wall ◽  
Expanded Polystyrene ◽  
Mechanical And Thermal Properties ◽  
Concrete Mixtures ◽  
Wall Structures ◽  
Different Types ◽  
Concrete Blocks ◽  
Recycled Masonry

The main aim of this paper is to carry out the environmentally based enhancement of a concrete mixture containing recycled materials whilst considering natural resource consumption as well as mechanical and thermal property levels. The developed concrete is intended to be used in mortarless masonry wall structures. Ten concrete mixtures with different types and replacement rates of recycled masonry aggregate and recycled expanded polystyrene were prepared, and their mechanical and thermal properties were experimentally investigated. It was found that the use of recycled masonry aggregate led to better thermal properties while maintaining sufficient mechanical properties. On the contrary, the addition of recycled expanded polystyrene did not significantly affect the thermal properties of concrete, but the mechanical properties considerably declined. For this reason, the recycled masonry aggregate is suitable to use as an aggregate for concrete masonry blocks for wall structures.

Electron Transport in Boron-Rich Borides

1987 ◽  
Vol 97 ◽  
Author(s):  
O. A. Golikova
Keyword(s):  
Thermal Properties ◽  
Electron Transport ◽  
Chemical Properties ◽  
Amorphous Semiconductors ◽  
Physico Chemical

Boron-rich borides represent a class of unique semiconductors. They combine the physico-chemical properties of refractory crystals with the electrical, optical, thermal properties typical for amorphous semiconductors [ 1–3 ].

scholarly journals Modification of Physico-Chemical Properties of Acryl-Coated Polypropylene Foils for Food Packaging by Reactive Particles from Oxygen Plasma

Materials ◽  
2018 ◽  
Vol 11 (3) ◽  
pp. 372 ◽  
Author(s):  
Tomislava Vukušić ◽  
Alenka Vesel ◽  
Matej Holc ◽  
Mario Ščetar ◽  
Anet Jambrak ◽  
...  
Keyword(s):  
Food Packaging ◽  
Oxygen Plasma ◽  
Chemical Properties ◽  
Physico Chemical ◽  
Reactive Particles

scholarly journals Gelatin: sources, preparation and application in food and biomedicine

2020 ◽  
pp. 28-46
Author(s):  
Elvira Shatabayeva ◽  
Grigoriy Mun ◽  
Yerengaip Shaikhutdinov ◽  
Vitaliy Khutoryanskiy
Keyword(s):  
Pharmaceutical Industry ◽  
Food Packaging ◽  
Chemical Properties ◽  
Essential Amino Acids ◽  
Biologically Active ◽  
Wound Dressings ◽  
Human Gastrointestinal Tract ◽  
Physico Chemical ◽  
Anti Cancer ◽  
Cell Adhesion And Proliferation

Gelatin is a proteinaceous substance composed of all the essential amino acids (except tryptophan) and derived from collagen using a hydrolysis technique. Hydrogels and modified composites based on gelatin are widely used in the food industry, biomedicine, pharmaceutical industry and food packaging materials due to their biocompatibility, biodegradability, nonimmunogenicity and ability to stimulate cell adhesion and proliferation. Gelatin can absorb 5-10 times its weight of water and is the main ingredient of hard and soft capsules in pharmaceutical industry. It melts above 30°C and easily releases biologically active compounds, nutrients and drugs in human gastrointestinal tract. In addition, gelatin contains arginine-glycine-asparagine RGD-sequences in the polymer structure and contributes to various functions such as antioxidant, anti-hypertensive, anti-microbial, tissue regeneration, wound healing, enhances bone formation and anti-cancer therapy. This article reports a brief overview of gelatin sources, gelatin preparation processes and its physico-chemical properties, as well as advances in the preparation of gelatin-based composite materials and hydrogels for tissue engineering, drug delivery, wound dressings, active packaging using various cross-linking techniques.

Deviation of polarity from linearity in liquid mixtures containing an ionic liquid

2015 ◽  
Vol 17 (47) ◽  
pp. 31613-31617 ◽  
Author(s):  
Vijay Beniwal ◽  
Shashi K. Shukla ◽  
Anil Kumar
Keyword(s):  
Ionic Liquid ◽  
Intermolecular Interactions ◽  
Chemical Properties ◽  
Liquid Mixtures ◽  
Physico Chemical ◽  
Different Types ◽  
Linear Behaviour

The physico-chemical properties of liquid mixtures, in general, exhibit deviations from linear behaviour with respect to their composition, arising out of different types of cross-intermolecular interactions (both specific and non-specific).

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