توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱GAMMA IRRADIATION OF PLOY (L–LACTIDE) BIOPOLYMER
اطلاعات انتشار: دومین همایش ملی تکنولوژی های نوین در شیمی و پتروشیمی، سال
تعداد صفحات: ۴
Gamma irradiation is often used to sterilize biomedical devices for medical applications. However, high energy radiation can damage medical devices made from polymers, even at the minimum sterilization dose of 25 kGy. Radiation sterilization is especially damaging to biodegradable polymers, such as Poly(L–lactide) (PLLA) which even decompose when irradiated. In this research, neat PLLA was synthesized and irradiated by gamma irradiation processing. The physical and chemical properties of neat PLLA and irradiated PLLA were checked out using, FT–IR, XRD and SEM. The research results show that 25 KGy gamma irradiation don’t change the physical and mechanical properties of PLLAs. Also, it is found that with increasing the dosage of gamma to 100 KGy, the properties of PLLAs, due to decreasing the mechanical properties, are useless for medical performance<\div>

۲XPS AND MICOANALYSIS OF CARBOXYLATED MWCNTS
اطلاعات انتشار: دومین کنفرانس بین المللی نفت، گاز و پتروشیمی، سال
تعداد صفحات: ۶
Carboxylation is a procedure used in materials science to oxidize the surface of materials. Several researchers use this technique to improve Mutiwalled carbon nanotubes (MWCNTs) for interaction and dispersion in Matrix materials. The present article evaluates the effect of chemical carboxylation of CNTs. Sulfuric acid and nitric acids were used on the functionalization. Experimental results obtained by XPS spectroscopy indicated the maintenance of the structure of CNTs after all oxidations. The presence of other structures was proved by thermogravimetry decomposition and the addition of functional groups was confirmed by transform Fourier infrared spectroscopy. From these experimental results, we conclude that all methodologies used showed a percentage of adsorption of functional groups on the CNTs. Also, the SEM micrographs show that the MWCNTs were shortening during carboxylation.<\div>
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