تاثير هيدروليز قليايي و آمينوليز كردن بر فوق آبگريزي پارچه پلي استر

چكيده انگليسي :

Isfahan University of Technology Department of Textile Engineering The Effect of Alkaline hydrolysis and Aminolysis on the Superhydrophobicity of PET Fabric Zahra Mazrouei z mazrouei@tx iut ac ir November 2009 Department of Textile Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiA khoddami khoddami@cc iut ac ir Abstract Surface properties sometimes play a more important role in the function of polymer materials than dothe bulk of polymer materials Many functions of the polymer materials e g adhesion printability dye ability gloss biocompatibility and tribology are not related to the bulk of the polymer materials but rather to the topmost layer of the materials So far a wide variety of surface treatments techniqueshave been investigated for surface modification of polymer materials without any change in bulkproperties Superhydrophobic surface have been created by tailoring the surface topography and usingtechniques such as anodic oxidation electrodeposition and chemical etching plasma etching lasertreatment electrospinning chemical vapor deposition and sol gel processing in combination withsubstances such as silanes and fluorochemicals In this study several different and novel methods for fabrication of superhydrophobic polyester fabricwere investigated For the fabrication of the lotus leaf type fibers with self cleaning properties twomajor requirements should be considered 1 the fibers need to have low surface energy and 2 themagnitude of the degree of roughness to be created The used fluorocarbon imparted the minimum surface energy to polyester fibers Polyester weightreduction process alkaline hydrolysis by creating pits which mainly resulted from the presence ofTiO2 particles efficiently roughened the surface in order that after the fluorocarbon coating remarkable improvement in fabric repellent properties was observed In addition it was revealed thatthe achieved superhydrophobicity are affected also by other structural changes during alkalinehydrolysis Furthermore polyester fabric aminolysis generated surface cracks with subsequent surfaceroughness changed in that repellent properties was promoted The results indicate that surfacestructural changed by both alkaline hydrolysis and aminolysis was fair enough for engineeringsuperhydrophobic polyester fabric So that there was no necessity to use nanoparticles Comparisonthe smooth polyester film Melinex and the fabrics showed the importance of weave and knitstructure on surface topography and creating dual scale roughness irregularity in fabric structure and pits or cracks from hydrolysis with subsequent deep influence on superhydrophobicity Evaluation of fluorocarbon chain re orientation illustrated that the decay of hydrophobicity was not atthat level to adversely affect the self cleaning properties with water Moreover it was attempted toassess self cleaning properties objectively in addition to subjective measurement Key words Superhydrophobic surface alkaline hydrolysis Aminolysis nanoparticles polyesterfabric Surface roughness

مزروعي، زهرا

تاثير هيدروليز قليايي و آمينوليز كردن بر فوق آبگريزي پارچه پلي استر

نانو ذرات , سطح ناهموار