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    امروز  جمعه - ۲۸ دی - ۱۳۹۷  
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مرجع پلیمر در بازار ایران: تحقیقات زیادی توسط ناسا و دیگر سازمان های دولتی در دهه های 1960 و 1970 صورت گرفته است تا درک بهتری از کارایی مواد پلیمری در محیط های کریوژن (درجه حرارت کمتر از منفی 150 درجه سانتیگراد) حاصل شود. بخش عمده این تحقیق به منظور بهبود آببندی، پمپ ها، دریچه ها و یاطاقان مورد استفاده در برنامه های فضایی بود. استفاده از مواد پلاستیکی (مواد پلیمری) در محیط های کریوژن امروزه طیف گسترده ای از فناوری های نوظهور وجود ...

ABSTRACT: Recent years have witnessed great developments in biobased polymer packaging films for the serious environmental problems caused by the petroleum-based nonbiodegradable packaging materials. Chitosan is one of the most abundant biopolymers after cellulose. Chitosan-based materials have been widely applied in various fields for their biological and physical properties of biocompatibility, biodegradability, antimicrobial ability, and easy film forming ability. Different chitosanbased films have been fabricated and applied in the field of food packaging. Most of the review papers related to chitosan-based films are focusing on antibacterial food packaging films. Along with the advances in the nanotechnology and polymer science, numerous ...

Abstract: Thermoplastic polymers (such as polypropylene, polyethylene, polyvinyl chloride, polystyrene, etc.) are major constituents of municipal solid waste. Millions of tons of plastic waste are discarded each year, most of which is either incinerated or dumped in landfills. As an alternative, methods using these wastes as feeds for the production of value-added products such as fuels, carbon nanotubes, and porous carbons have been proposed by various researchers. In recent years there has been considerable research in the area of activated carbon production from plastic wastes and products with high surface areas and pore volumes have been produced. However, no literature survey has yet summarized the findings. Thus, herein, the studies pertaining ...


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