15203

13667

كارشناسي ارشد

صنايع پليمر

اصفهان : دانشگاه صنعتي اصفهان

1398

شانزده، 95ص.: مصور، جدول، نمودار.

روح الله باقري

احمد اسدي نژاد، مرتضي صادقي

1398/07/27

كتابنامه

مهندسي شيمي

مهندسي شيمي

1398/07/29

2561427

96 Synthesis of Water Borne Poly Urethane Acrylate Nano Clay Dispersions Investigation of Stability Mechanical and Thermal Properties Kiana Karimi Kiana karimi@ce iut ac ir July 1 2019 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiDr Rouhollah Bagheri bagheri@cc iut ac ir Abstract In recent years waterborne polyurethane dispersions as in coatings and adhesives formulations have attracted considerable attention because they are non toxic non ammable and friendly to environment Besides environmental management the exibility low temperature property high tensile strength good adhesion and improved rheological property are specific properties of waterborne polyurethanes However these materials have some defects such as weak water resistance in the moisture environment due to sensitivity of their hydrophilic ionic bonds and ester groups to hydrolysis short shelf life stability which need to be improved Also low heat resistance of these materials is due to a relatively low crystalline melting point or glass transition temperature of hard segments One of the best ways to solve these problems and improve their properties for different applications are addition of acrylate polymers and inorganic fillers especially Nano sized layered silicates within poly urethane acrylate matrix In this work waterborne poly urethane acrylate Nano composites with Polycaprolactone polyol IPDI and methyl methacrylate were synthesized by two different methods Reverse emulsion and semi Inter penetrating Networks The acrylic to urethane ratio was kept at 15 85 and 30 70 by weight throughout The chemical formation of dispersions Stability of dispersion Thermal properties and mechanical properties were studied by ATR FTIR spectroscopy dynamic light scattering and Zeta potential TGA and Tensile test respectively The results showed that stable PUA dispersions have been successfully synthesized but poly urethane acrylate dispersion made in semi penetrating networks method by urethane acrylate ratio 70 30 showed better properties On the next step poly urethane acrylate Nano composites were synthesized by incorporation 0 5 1 2 and 2 5 weight of Cloisite 30B as reinforcement The results showed that incorporation of clay into poly urethane acrylate did reduce water absorption and increased heat resistance modulus and particle size dispersion of nanoparticles in the samples was characterized by X Ray Key words Water Borne Poly Urethane Acrylate Dispersion Nano Clay Shelf LifeStability Thermal Properties Mechanical Properties

روح الله باقري

احمد اسدي نژاد، مرتضي صادقي