Biopolymer Applications Journal

Adsorption of methylene blue dyes in aqueous medium by polylactic acid/olive husk flours biocomposites

Lisa Klaai — 2025-01-30

The dyes present in the waste from the textile industry represent a real danger for humans and their environment, due to their low biodegradability and their toxicity. For this, new eco-designed technologies for the treatment of polluted water. Several materials have been used in photocatalysis.
This work aims to degrade the dye Methylene Blue (BM) by photo catalysis-solar using polylactic acid /Olive husk flours biocomposites materials.
The degradation of this substance was followed by UV/Visible spectrophotometry, and the best result was obtained by the composite material loaded with 30% olive husk

Aging of the composite material in different environments

Bahia BOUBEKEUR — 2025-01-30

The present work concerns the study of aging a new biodegradable material by mixing the poly lactic acid (PLA), thermoplastic biodegradable, with a low density in the presence of compatibilist PE-GMA in a different environment. The sample formulations LDPE/PLA/PE-GMA (20/80/5; 0/100/0; 100/0/0) are tested in soil and water over time. The aged samples are characterized (by mass loss, pH, and infrared spectroscopy). The results show that the mass loss of blend LDPE/PLA/PE-GMA is 24% after 5 weeks in water at 60°C. The pH value decreases over time. A negligible amount of mass loss in the soil is observed with a pH of 5 and ambient temperature. All results are confirmed by analysis of Infrared Spectroscopy

Study of the effect of the introduction of plant fibers on the properties of composites

Badrina DAIRI — 2025-01-30

To reduce the massive consumption of HDPE, which causes environmental problems, we offer biodegradable composite materials, at low cost and with low density. In this context, a study devoted to the valorization of lignocellulosic waste, a particular interest has been brought to the pistachio shell filler, as vegetable filler in the manufacture of high-density polyethylene matrix composite materials with a filler rate of 5% to 15%. The HDPE/FCP composites were initially mixed in a calendar before preparing the different sample shapes with a thickness of 2 and 3mm by compression at 190°C. The latter were characterized by various techniques: rheological, mechanical, physical tests, and morphological.

Comparative analysis of extracted chitosan versus commercial one: physiochemical effects of extraction

Aicha DEHANE — 2025-01-30

This study successfully extracted chitosan from waste generated by local shrimp shells. Functional and physicochemical properties of Chitosan produced have been evaluated by several methods such as FTIR, XRD and DSC. The obtained chitosan showed similar physicochemical properties compared to commercial one prepared. Structure was confirmed by Fourier transform infrared spectroscopy; X-ray diffraction and differential scanning calorimeter have same differences to refer to the effect of methods of extractions and type of shrimp shells waste.

Polymethyl methacrylate UV aging: numerical modeling and experimental validation

Aghilas HANNOU — 2025-01-31

This work focuses on the experimental study and numerical modeling of the effect of UV aging on the macroscopic and microscopic behavior of Polymethyl Methacrylate (PMMA). The PMMA specimens, elaborated with the plastic molding process, were exposed to UV radiation in a chamber for two aging times: 120h and 250h. Thereafter, the specimens before and after exposures to UV radiation were visually analyzed and weighed on an analytical balance. Compression tests were carried out on the specimens with a strain rate of 10-3s-1. The effect of UV radiation on PMMA specimens was manifested at the macroscopic scale by: yellowing of the specimens, loss of mass, and decrease of some mechanical properties such as Young's modulus, and at the microscopic scale by breaking the c=o chains. UV aging was modeled by introducing mass loss into Young's modulus values. The model was implemented in the finite element code using the VUMAT subroutine. Simulations were conducted on PMMA specimens with different periods of exposure to UV radiation. Comparisons with experimental results demonstrated the capability of the implemented model to simulate the UV aging effect.