Journal of Polymers and the Environment
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Diethanolamides of Castor Oil as Polyols for the Development of Water-Blown Polyurethane Foam
Journal of Polymers and the Environment - Tập 19 - Trang 698-705 - 2011
Castor oil was chemically modified into a diethanolamide by a two step process. The first step was the hydroxylation of double bonds in castor oil and second step was the transamidation using diethanolamine to increase the hydroxyl value. Water blown polyurethane foams were developed with this castor oil based polyol using polypropylene glycol of molecular weight 1,000 as the copolyol and polymeri......
Comparison of Conventional and Microwave-assisted Extraction of Pectin from Watermelon Rind
Journal of Polymers and the Environment - Tập 31 - Trang 3363-3371 - 2023
Microwave-assisted extraction (MAE) and conventional heating extraction (CHE) techniques have been employed to extract pectin from watermelon rind. Pectin extraction was performed under microwave irradiation at different power levels (100, 300, and 500 W) and irradiation times and compared with the CHE method. MAE method exhibits much higher efficiency than conventional extraction and the highest ......
Study on Biodegradable Starch/OMMT Nanocomposites for Packaging Applications
Journal of Polymers and the Environment - Tập 17 - Trang 203-207 - 2009
The thermoplastic starch (TPS) and nanocomposite(TPS/OMMT) was prepared with 15% carbamide, 15% ethanolamine and different contents of organic activated montmorillonite (OMMT) by twin-screw extruder with a 130 °C barrel temperature. Fourier transforms infrared spectroscopy and wide angle X-ray diffraction shown that the alkylamine in dodecyl benzyl dimethyl ammonium bromide could react with MMT vi......
Influence of Organically Modified Nanoclay on Thermal and Combustion Properties of Bagasse Reinforced HDPE Nanocomposites
Journal of Polymers and the Environment - Tập 25 - Trang 1198-1207 - 2016
The nanocomposites of high density polyethylene (HDPE)/bagasse flour (BF) with different contents of the organomodified montmorillonite (OMMT) were produced by melt blending process. The thermal stability and combustion behavior of nanocomposites were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry, and cone calorimeter tests. The results of TGA data of the nan......
Effects of Coagulation Residence Time on the Morphology and Properties of Poly (vinyl) Alcohol (PVA) Asymmetric Membrane via NIPS Method for O2/N2 Separation
Journal of Polymers and the Environment - Tập 28 - Trang 2810-2822 - 2020
This study revealed, a thorough investigation of coagulation residence time effects on the morphology, crystallinity, mechanical properties and oxygen (O2), nitrogen (N2) gas transport behaviour of asymmetric membranes prepared through PVA/water/THF ternary system using non-solvent induced phase separation method. For this purpose PVA asymmetric membranes were fabricated at different coagulation r......
Single-Plant Biocomposite from Ricinus Communis: Preparation, Properties and Environmental Performance
Journal of Polymers and the Environment - Tập 21 - Trang 366-374 - 2012
A single-plant biobased composite material was prepared from fibre and matrix constituents produced from the castor plant, ricinus communis. It is shown that the mechanical properties of the castor plant fibres are comparable to those of other bast fibres and that the stiffness and strength characteristics of the castor fibre/polyamide 11 biocomposite compare well with those of other natural fibre......
Enhancing the Oil Adsorption Properties of Cellulose Nanofiber Aerogels Through Chemical Modification
Journal of Polymers and the Environment - - Trang 1-10 - 2023
The primary objective of the study was to develop a method for enhancing the oil adsorption capacity of cellulose nanofibers (CNFs) by modifying their surface. To achieve this goal, aerogels were first dried in a freeze dryer, followed by surface hydrophobization of CNFs using hexadecyltrimethoxysilane (HDTMS) as the modifier. The optimal concentration of the HDTMS for enhancing the nanofiber’s su......
PLA and Organoclays Nanocomposites: Degradation Process and Evaluation of ecotoxicity Using Allium cepa as Test Organism
Journal of Polymers and the Environment - Tập 21 - Trang 1052-1063 - 2013
In this study, nanocomposites of PLA and organoclays Cloisite 20A and Cloisite 30B were prepared by the melt intercalation method and the obtained samples were characterized by transmission electron microscopy (TEM). Since composting is an important proposal to the final disposal of biopolymers, the influence of clays on the hydrolytic degradation process of PLA was evaluated by visual analysis an......
The Integration of Methylene Blue Decolorization with Polyhydroxyalkanoate (PHA) Production Using Enterobacter Strain TS1L
Journal of Polymers and the Environment - Tập 31 - Trang 1202-1208 - 2022
The present study focused on the decolorization of methylene blue (MB) and the production of polyhydroxyalkanoate (PHA) by Enterobacter strain TS1L using PHA medium containing 50 mg/l of MB. The highest PHA production at 56.02 ± 6.26% of dry cell weight (% DCW) was observed after 24 h of cultivation, while the most effective dye decolorization at 92.57 ± 0.03% was observed after 72 h of cultivatio......
Optimization of Microwave-Assisted and Conventional Heating Comparative Synthesis of Poly(lactic acid) by Direct Melt Polycondensation from Agroindustrial Banana (Musa AAA Cavendish) and Pineapple (Ananas comosus) Fermented Wastes
Journal of Polymers and the Environment - Tập 22 Số 3 - Trang 393-397 - 2014
In Costa Rica, a lot of pineapple (Ananas comosus) and banana (Musa AAA) agroindustrial residues are generated each year. These residues can be used to obtain l-lactic acid by fermentation, ultrafiltration and electrodialysis. Poly(l-lactic acid) (PLLA) is a biodegradable and renewable polyester with many industrial and biomedical applications. There is a growing interest to improve the energetic ......
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