مقالههای Gity Mir Mohamad Sadeghi
توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
اطلاعات انتشار: کنفرانس بین المللی فرآورش پلیمرها، سال ۱۳۹۰
تعداد صفحات: ۴
Cellulose is a biocompatible and biodegradable polymer that is widely used in the textile industry. Cellulose fibres are wasted during processing and final usages. These fibers are valuable resources for the production of cellulose powder which is one of the useful physical forms of cellulose. Cellulose nano–powder maintains the original properties of cellulose and also has large marketing potential in biomaterials, food additives, cosmetics and pharmaceutical industries. In this research, an environmental friendly process without solvents or chemical reactants, enzymatic hydrolysis in combination with a short time and low power sonication, has been used to produce cellulose nano–particles from cotton and lyocell waste fibers. The structure and geometrical characteristics of the samples were investigated by SEM, FTIR, and Laser Light Scattering. The results showed that the fiber diameter decreases during the hydrolysis process. The particle size distribution analysis indicated that the median size of the produced nano–particles from cotton and lyocell fibers were 70 and 50 nm, respectively. The SEM images showed that both cotton and lyocell nano–particles have spherical shapes. FTIR studies denoted that the enzymatic treatment and ultrasonic have no significant changes on the chemical structure of cotton and lyocell fibers.<\div>
۲Investigating the effects of chemical modification of clay nanoparticles on thermal degradation and mechanical properties of TPU\nanoclay composites
اطلاعات انتشار: Journal of Particle Science and Technology، اول،شماره۱، Winter ۲۰۱۵، سال ۰
تعداد صفحات: ۱۱
Thermoplastic polyurethane (TPU)\clay nanocomposites were prepared via a melt–compounding method using ester type TPU and two different modified organoclays (Cloisite 30B and Cloisite 15A) in different contents. The Effects of the chemical structure and content of the nanoclays on the thermal degradation and mechanical properties of TPU were also investigated. The effect of structural modification on dispersion during melt compounding has been studied by XRD and FTIR analysis. Barrier effect formation and thermal stability in both nanocomposites containing different nanoparticle content have been studied. The effect of chemical modification of the nanoparticles on mechanical properties in all contents has been investigated. The XRD results show that better dispersion near the exfoliated structure obtained for cloisite 30B is due to good interaction via hydrogen bonding between the TPU chains and layered silicate. A high content of the nanoparticles leads to disordering of soft and hard segments in the TPU chains, which is confirmed by FTIR. Mechanical properties analysis shows that the TPU\Cloisite 30B nanocomposites have higher modulus and tensile strength as well as elongation at break by the addition of 2% in both cloisite 30B (C30B) and cloisite 15A (C15A) than other contents of nanoclays.
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