نتایج جستجو برای: unsaturated polymer

تعداد نتایج: 109327  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید باهنر کرمان - دانشکده فنی 1390

در این تحقیق آنالیز جریان غیراشباع با تلاش در برطرف نمودن برخی محدودیت های روش های قبلی صورت گرفته است. از جمله اعمال شرایط حقیقی در مدل ها مبتنی بر واقعیت بیرونی است که مهم ترین آن ها وارد نمودن مشخصات هیدرولیکی و درجه اشباع اولیه خاک است. اعمال این موارد و بررسی آن ها در دو مدل ستون خاک و چاه، نشان دهنده چگونگی تغییرات مکش در اعماق است. چنان که بیشترین مقدار آن در مدل اول در نزدیکی زمین رخ می...

Journal: : 2023

Introduction. With the development of chemical industry, search for and synthesis new, modification existing nanocatalytic systems are great importance. In view this, preparation new catalysts by immobilization transition metal metals in a polymer matrix becomes an important direction synthesis. Purpose this work is to submit experimental data on study catalytic properties silver nickel nanostr...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده علوم پایه 1390

abstract in this study, we synthesized a novel template polymer by using methacrylic acid (mma) as functional monomer, ethylene glycol dimethacrylate(egdma) as cross linker, 2,2-azobisisobutyronitrile (aibn) as initiator and olanzapine as targeted molecule in the presence of chloroform and acetonitrile as solvent. the products have been characterized and confirmed by (chn)elemental analysis,...

2012
Kelly A. Burke Patrick T. Mather

Main-chain liquid crystalline polymers were synthesized from diene mesogens using acyclic diene metathesis polymerization to control the thermal properties of an unsaturated polymer that may subsequently be crosslinked to form nematic networks. The mesogen homopolymer forms a nematic phase with a glass transition of 74 C and an isotropization temperature of 189 C. Copolymerizing the mesogenic m...

Journal: :Journal of the American Chemical Society 2006
Hyunjoon Song Robert M Rioux James D Hoefelmeyer Russell Komor Krisztian Niesz Michael Grass Peidong Yang Gabor A Somorjai

A novel high surface area heterogeneous catalyst based on solution phase colloidal nanoparticle chemistry has been developed. Monodisperse platinum nanoparticles of 1.7-7.1 nm have been synthesized by alcohol reduction methods and incorporated into mesoporous SBA-15 silica during hydrothermal synthesis. Characterization of the Pt/SBA-15 catalysts suggests that Pt particles are located within th...

Anjali Krishnan Mathew Ukken Muhammed Basheer Ummathur,

Condensation of aromatic aldehydes with benzoyl acetone under specified conditions yieldedtwo series of polycarbonyl compounds in which the keto group is attached to olefinic linkage.Spectral and analytical data revealed the formation of an unsaturated triketone from pyridine-3-carbaldehyde and unsaturated diketone from furfural, salicylaldehyde and 2-hydroxynaphthaldehyde. Analytical, IR, 1H N...

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