List of Articles
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Open Access Article
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Zahra Talebpour Zeinab Zamani -
Open Access Article
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Mohammad Azadi Mehrnaz Farokhpour -
Open Access Article
3 - A Review of Mechanical Recycling of Polylactic Acid: Challenges and Recent Achievements
Farzane TabatabaeeThe growing use of polylactic acid (PLA) encourages technologists to conduct extensive research into valorization of PLA waste with best quality. In general, mechanical recycling of PLA is one of the most cost-effective recycling methods. However, recycled materials are MoreThe growing use of polylactic acid (PLA) encourages technologists to conduct extensive research into valorization of PLA waste with best quality. In general, mechanical recycling of PLA is one of the most cost-effective recycling methods. However, recycled materials are commonly used for minor applications due to the inherent thermo-mechanical degradation of the polymer during recycling, which mainly results in chain scissions and intramolecular and intermolecular transesterification reactions. Therefore, it has a negative effect on the molar mass distribution and consequently on the mechanical, thermal and rheological properties of recycled PLA. In this article, a review of recent research on the effects of mechanical recycling on the properties of PLA including structural, morphological, mechanical, rheological and thermal changes was done. Furthermore, a review of three main ways of valorization of recycled PLA including thermal modification, chemical modifications in the presence of stabilizers, chain extenders, branching agents and finally mixing with nanoadditives or with other polymers was done in order to improve the properties of recycled PLA. Moreover, due to the widespread use of natural fibers to improve the performance of PLA, the recyclability of natural fiber-reinforced PLA biocomposites was investigated. Finally, two important applications of recycled PLA in the food packaging and the 3D printing industries were discussed. Manuscript profile -
Open Access Article
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Farzad Mehrjo -
Open Access Article
5 - Review on the Polysulfone Based Membranes for Separation of Low-Density Lipoprotein from Blood
Rahim Dehghan Jalal Barzin Behnam Darabi Hamidreza GhaderiCardiovascular diseases are the most common cause of fatality all over the world. A severe increase of low-density lipoprotein (LDL) concentration in blood is recognized as the main cause of coronary artery disease (CAD) and atherosclerosis. LDL apheresis from blood is MoreCardiovascular diseases are the most common cause of fatality all over the world. A severe increase of low-density lipoprotein (LDL) concentration in blood is recognized as the main cause of coronary artery disease (CAD) and atherosclerosis. LDL apheresis from blood is one of the extracorporeal options for patients suffering from this disorder which drug therapy is not effective for them. LDL apheresis is classified in cascade filtration and adsorption-based methods. In this study further reviewing all LDL apheresis techniques, polysulfone (PSU) membranes for selective adsorption of LDL were investigated. By inspiring from inherent LDL receptor (LDLR) of body, different methods including heparinization of PSU membrane by various methods such as chloromethylation, treatment with ammonia plasma and co-deposition of polydopamine and polyethyleneimine can be used for adsorption of LDL from the blood. Also, membrane ionic glycosylation by click chemistry and grafting of alginate sulfate on the surface of PSU membrane to adsorption of LDL were reviewed. To investigate surface modification accuracy, different analyses such as X-ray photo spectroscopy (XPS), Attenuated total reflectance Fourier transform infrared (ATR-FTIR), -Potential and water contact angle are used. Blood compatibility is another factor for the development of these membranes for defined application. Manuscript profile -
Open Access Article
6 - Polyoxymetal / polymer composites An overview of synthesis methods and their properties
Marziyeh Kavian Milad Ghani Jahan Bakhsh RaoofThis article gives an overview of the manufacturing method and properties of composites containing polyoxymetals / polymers. Polyoxometals (POMs) are discrete, molecular, metal oxide clusters of various sizes ranging from one to several nanometers that exhibit different MoreThis article gives an overview of the manufacturing method and properties of composites containing polyoxymetals / polymers. Polyoxometals (POMs) are discrete, molecular, metal oxide clusters of various sizes ranging from one to several nanometers that exhibit different topologies and diverse chemical and electronic properties. POMs show very strong acidity, which makes them effective acid catalysts for specific reactions such as esterification, hydrolysis, Friedel-Craft alkylation, and tetrahydrofuran ring-opening polymerization. The integration of mineral components with polymer matrices will combine the properties of the mineral phase with polymers and create new functions. Mineral micrometer building blocks have been used to enhance mechanical strength, improve thermal and chemical stability, and improve the performance of polymeric materials. With the rapid development of nanotechnology, polymers can also be used as a substrate for the stabilization of nanostructures, which will eventually have the properties of nanostructures and polymer substrates at the same time. Methods such as physical composition, electrostatic adsorption, covalent bonding, and supermolecular modification are the main methods for combining POM in organic or inorganic polymer matrices (eg silica). Polyoxymetal / polymer composites have various properties such as unique optical, electrical or catalytic properties of polyoxymetals and the optimal processing and stability of polymer matrices. POM/ polymer composites may have many applications in optics, electronics, biology, medicine and catalysis Manuscript profile