En
  • دکتری (1390)

    مهندسی پلیمر - صنایع پلیمر

    صنعتی امیر کبیر، تهران، ایران

  • کارشناسی‌ارشد (1385)

    مهندسی پلیمر - صنایع پلیمر

    صنعتی امیر کبیر، تهران، ایران

  • کارشناسی (1382)

    مهندسی پلیمر - صنایع پلیمر

    دانشگاه صنعتی امیرکبیر، تهران، ایران

  • ریولوژی مولکولی
  • الاستومرهای گرمانرم پخت شده
  • پلیمرهای زیست‌تخریب‌پذیر

    در 27 آذر 59 در شهر اصفهان به دنیا آمدم. از سال 1367 وارد مدرسه شدم و بدون وقفه و پس از 24 سال تحصیل در سال 90 از پایان‌نامه خود در مقطع دکترا دفاع کردم. من و هم‌قطارانم در فضایی رقابتی در آموزش رشد کردیم و این پیامد شرایط حاکم بر کشور بود. فرزند ایرانم و در ایران پرورش یافتم. در هر سه مقطع کارشناسی، کارشناسی ارشد و دکترا در دانشکده مهندسی پلیمر دانشگاه صنعتی امیرکبیر تحصیل کردم. برای آن که این 12 سال تحصیل یکنواخت نشود و توشه بیشتری برچینم، هر مقطع را با یک استاد راهنما گذراندم. یکی از خوشبختی‌هایم تحصیل در رشته مهندسی پلیمر است چرا که این مواد نوین از دیرباز کم‌وبیش با همان ساختار صنعتی در زیست موجودات زنده هم بکار گرفته شده‌اند! به نظرم ریولوژی زمینه‌ای است که یک مهندس پلیمر را از دیگر دانش‌آموختگان متمایز می‌کند و به همین خاطر در دوره دکترا پروژه خود را آگاهانه به این سو راندم و در آن دستاوردهایی داشتم. زمینه‌های پژوهشی که برگزیده‌ام از علاقه، تجربه در دوران تحصیل و نیاز امروز بر آمده‌اند و تا جایی که بتوانم سعی در بومی‌سازی در عین بین‌المللی بودن دارم. نوآوری در این راه بسیار یاری‌گر است و انتظار می‌رود همراهی با دانشجویان پویایی که در بهترین سال‌های جوانی هستند بیشتر از دیگران به وارد ساختن خلاقیت و نوآوری اثرگذار باشد. به شعر پارسی علاقمندم و هنر خوشنویسی نستعلیق را فخر هنر ایران می‌دانم که در غم و شادی بدانها پناه می‌آورم. البته چند سالی است که کمتر فرصت می‌کنم به این دو بپردازم، به ویژه دومی. فراموش نکنیم ریولوژی‌دانان برآنند که "همه چیز جریان می‌یابد" و در فیزیک حرکت مطلق و سکون نسبی است. پس شرط ماندن حرکت است و آن نیازمند دانستن و دانستن بی‌پایان.

    ارتباط

    رزومه

    A new closure approximation based on the Cohen/Pad? spring law and a novel method for its implementation

    Abbas Sheikh
    Journal PapersRheologica Acta , Volume 56 , Issue 2, 2017 February 1, {Pages 135-148 }

    Abstract

    A new closure-approximated model based on the Cohen/Pad? (CP) spring law is presented. Because it is inspired by the finitely extensible non-linear elastic Peterlin version (FENE-P), the model is titled CP-P. The rheological behaviors in simple and pressure-driven pipe shear flows in both the steady-state and time-dependent conditions are compared between the two models. To this end, a new approach based on the second moment Fokker–Planck equation instead of the Langevin equation is developed, which was confirmed by means of the existing analytical and stochastic data prior to its use. Application of this new approach is restricted to the closure approximated models but at a much less computational expense than the CONNFFES

    Peroxide dynamic crosslinking in impact modification of polypropylene with polybutadiene

    Atefe Saffari, Abbas Sheikh
    Journal PapersPolymer Testing , Volume 57 , 2017 February 1, {Pages 260-269 }

    Abstract

    Polypropylene was blended with polybutadiene in an internal mixer in order to improve its toughness. The rubber content ranged from 10 to 20 wt.% and dicumyl peroxide (DCP) was added to provide required radicals for dynamic crosslinking of polybutadiene, and for in-situ compatibilization of the phases. This was done using two sequences of mixing. In addition, zinc dimethacrylate was utilized as a co-agent to control chain scission of PP, enhance the interfacial reactions and increase compatibility of the components. In obtaining the optimum blend, the Taguchi orthogonal experimental design was applied and results of Izod impact strength test were concordantly related to crystallinity of the polypropylene, morphology of the blends and reacti

    Parametric study of FENE and FENE-P models in steady and unsteady flow in a circular pipe using CONNFFESSIT approach

    Abbas Sheikh, Farhad Sharif
    Journal PapersJournal of Non-Newtonian Fluid Mechanics , Volume 166 , Issue 17-18, 2011 September 18, {Pages 1012-1023 }

    Abstract

    The temporal rheological behavior of FENE and FENE-P models is investigated using the flow in a circular, straight tube. The CONNFFESSIT approach is applied to simulate transient Hagen–Poiseuille flow for different pressure drops and model parameters. The material functions for steady and unsteady flow were extracted and compared with the reported values in the literature when it was available. For the case of the FENE model, where there is no analytical solution, the relationship between model parameters and rheological behavior has been discussed and compared with the FENE-P model.

    posites > Polymer Composites > Vol 30 Issue 2 > Abstract JOURNAL TOOLS Get New Content Alerts Get RSS feed Save to My Profile Get Sample Copy Recommend to?…

    Fateme Goharpey, Amin Mirzadeh, Abbas Sheikh, Hossein Nazockdast, Ali Asghar Katbab
    Journal PapersPolymer Composites , Volume 30 , Issue 2, 2009 February , {Pages 182-187 }

    Abstract

    Study on microstructure, rheological, and mechanical properties of cellulose short fiber reinforced TPVs based on EPDM/PP

    F Goharpey, A Mirzadeh, A Sheikh, H Nazockdast, AA Katbab
    Journal PapersPolymer Composites , Volume 30 , Issue 2, 2009 February , {Pages 182-187 }

    Abstract

    The morphology, rheology, and mechanical properties of the dynamically vulcanized thermoplastic elastomer based on EPDM/PP (60/40, w:w) containing 5, 10, and 20% of cellulose short fiber were studied. From the results it was found that addition of 5% of cellulose fiber has no significant effect on the maximum torque associated with the dynamic vulcanization stage, while higher concentration of fibers decreased the maximum torque. These results were explained in terms of influence of cellulose fibers on the extent of agglomeration formed between the cured rubber particles. The results of tensile test performed on the samples showed that incorporation of 5% of cellulose fibers into the sample has an increasing effect on elongation at break

    posites > Polymer Composites > Vol 30 Issue 2 > Abstract JOURNAL TOOLS Get New Content Alerts Get RSS feed Save to My Profile Get Sample Copy...

    Fateme Goharpey, Amin Mirzadeh, Abbas Sheikh, Hossein Nazockdast, Ali Asghar Katbab
    Journal PapersPolymer Composites , Volume 30 , Issue 2, 2009 February , {Pages 182-187 }

    Abstract

    vorheriger Artikel Roles of chemical and physical crosslinking on... n?chster Artikel Linear viscoelasticity of a dilute active suspe...

    Abbas Sheikh
    Journal Papers , January , {Pages }

    Abstract

    A new closure-approximated model based on the Cohen/Pad? (CP) spring law is presented. Because it is inspired by the finitely extensible non-linear elastic Peterlin version (FENE-P), the model is titled CP-P. The rheological behaviors in simple and pressure-driven pipe shear flows in both the steady-state and time-dependent conditions are compared between the two models. To this end, a new approach based on the second moment Fokker–Planck equation instead of the Langevin equation is developed, which was confirmed by means of the existing analytical and stochastic data prior to its use. Application of this new approach is restricted to the closure approximated models but at a much less computational expense than the CONNFFESSIT-like simula

    Effects of Gelatin and Nano‐ZnO on the Performance and Properties of Cellulose Acetate Water Membranes

    Elnaz Sheikh, Abbas Sheikh
    Journal PapersChemical Engineering & Technology , January , {Pages }

    Abstract

    Biodegradable cellulose acetate (CA) membranes were prepared via phase inversion induced by immersion precipitation method. Acetic acid and deionized water were used as a solvent and a non‐solvent, respectively. The modifying effect of gelatin and zinc oxide (ZnO) nanoparticles additives was investigated on the membranes in terms of water flux, protein rejection percentage, and fouling ability during 2 hours of bovine serum albumin separation from aqueous solution. Additionally, specimens were characterized using scanning electron microscopy (SEM), Fourier‐transform infrared spectroscopy (FTIR), tensile test, contact angle technique, and porosity measurement. The incorporation of gelatin and ZnO nanoparticles into the cellulose acetate

    /pro/academic_staff/asheikh/publication

    دروس نیمسال جاری

    • كارشناسي ارشد
      رئولوژي و فراورش لاستيك ( واحد)
      دانشکده مهندسی شیمی، گروه مهندسي پليمر

    دروس نیمسال قبل

    • كارشناسي ارشد
      تعيين خواص، مشخصات و كاربرد مواد نانوپليمري ( واحد)
      دانشکده مهندسی شیمی، گروه مهندسي پليمر
    • 1400
      جنابي اسكويي, عذرا
      الاستومرهاي گرمانرم بر پايه پلي پروپيلن/پلي بوتادي ان پخت شده ديناميكي با سامانه پخت پراكسيدي و كمك واكنشگر
      داده ای یافت نشد
      داده ای یافت نشد

    مهم

    جدید

      اطلاعیه ای درج نشده است