نتایج جستجو برای: آنالیز dmta

تعداد نتایج: 41302  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید باهنر کرمان - دانشکده فنی 1393

جهت تهیه ترکیب محصولی با خواص فیزیکی و پایداری مطلوب، به مهندسی معکوس برروی نمونهای با سابقه پرداختیم. خواص فیزیکی نمونهای مرغوب که برای تولید چمن مصنوعی مناسب است را بررسی و آزمایشهای تنش–کرنش(در دمای محیط و یخزدگی)، شاخص جریان مذاب(mfi)، آنالیز گرما وزن سنجی(tga)، گرماسنجی پویشی تفاضلی(dsc)، آنالیز حرارتی دینامیکی–مکانیکی(dmta) و کروماتوگرافی گازی-طیف سنجی جرمی(gc-ms) برروی نمونه شاهد انجام ش...

Aiyoub Parchehbaf Jadid Meysam Nouri Molalar Mohammad Hossein Nasirtabrizi, Zahed Ghashangi,

4-ChloroMethyl Styrene (CMS) was copolymerized with different monomers such as Methyl MethAcrylate (MMA), Methyl Acrylate (MA), 2-EthylHexyl Acrylate (EHA) by free radical polymerization method at 70 ±1°C using a,a'-Azobis(IsoButyroNitrile) (AIBN) as an initiator. The copolymer compositions were obtained using related 1HNMR spectra and the poly...

Journal: :International journal of pharmaceutics 2006
K S C R dos Santos J F J Coelho P Ferreira I Pinto S G Lorenzetti E I Ferreira O Z Higa M H Gil

Chitosan based membranes to be applied on wound healing as topical drug delivery systems were developed by graft copolymerization of acrylic acid (AA) and 2-hydroxyethyl methacrylate (HEMA) onto chitosan using cerium ammonium nitrate as chemical initiator. Evidence for graft copolymerization of the vinyl monomers onto chitosan was obtained by FTIR and DMTA. Swelling degree, cytotoxicity, thromb...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 1999
meysam nouri molalar zahed ghashangi, mohammad hossein nasirtabrizi aiyoub parchehbaf jadid

4-chloromethyl styrene (cms) was copolymerized with different monomers such as methyl methacrylate (mma), methyl acrylate (ma), 2-ethylhexyl acrylate (eha) by free radical polymerization method at 70 ±1°c using a,a'-azobis(isobutyronitrile) (aibn) as an initiator. the copolymer compositions were obtained using related 1hnmr spectra and the polydispersity of the copolymers were determined using ...

2005
Douglas de Britto Sérgio P. Campana-Filho

Films of chitosan and N,N,N-trimethylchitosan were cast from aqueous solutions. Chitosan was dissolved in 1% acetic acid while deionized water was the solvent for N,N,N-trimethylchitosan chloride. The resulting films presented different mechanical behaviors as evaluated by DMTA. The film of chitosan exhibited an elastic-type behavior while that of N,N,N-trimethylchitosan was typically viscous. ...

2010
E. Franco - Urquiza O. O. Santana J. Gámez A. B. Martínez M. Ll. Maspoch

Films of EVOH copolymers, processed three times by twin-screw extrusion were prepared using a cast-film line. The variation on the melt flow rate (MFR) and rheological behaviour of the films were determined, as well as the thermal properties assessed by differential scanning calorimetry (DSC) and dynamic-mechanical thermal analysis (DMTA). As the results showed that the reprocessing induced an ...

Journal: :Palaeogeography, Palaeoclimatology, Palaeoecology 2022

The climatic cooling that began in the late middle Eocene and culminated Eocene-Oligocene transition meant major changes Palaeotheriidae (Perissodactyla, Mammalia) biodiversity Europe could have caused appearance of new dietary strategies. This work is first to study spatiotemporal response one palaeotheriid genus (Plagiolophus) environmental ecological using three proxies: hypsodonty, mesowear...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2011
majid abdouss tohid farajpour, morteza derakhshani

epoxy – polysulfide copolymers without or with low amounts of epoxy in their structure have poor mechanical properties in oxidative curing system.to strengthen the mechanical properties of polysulfide elastomer inclusion of epoxy resin (epon828) as hard segment was studied. ft-ir spectroscopy and rheometry were used to verify the formation of epoxy-polysulfide copolymer.  results obtained from ...

Journal: :Frontiers in Ecology and Evolution 2022

Serows and gorals (Bovidae, Caprinae) are emblematic antelopes distributed in Southeast Asia. They all nearly threaten or vulnerable species nowadays despite having a more widespread distribution during the Pleistocene. Fossils of three native caprine species, i.e., Sumatran serow Capricornis sumatraensis , Chinese goral Naemorhedus griseus Himalayan were recovered from four Pleistocene paleont...

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