Synthesis and characterization of surface sulfonated polypropylene films

Download
2004
Ecevit, Safiye Tuba
The basic reseach on the surface sulfonation of the polypropylene is very important due to the surface design for higher functionalization. For this purpose, liquid-phase sulfonation of the polypropylene surfaces at various temperatures for different time periods were performed by concentrated sulphuric acid. The physical and chemical changes formed by the effect of the sulfonation on the polypropylene surfaces were determined by contact angle measurement, mechanical analysis, UV-Vis spectrometer, differential scanning calorimeter (DSC) and scanning electron microscopy (SEM). The surface polarity and wetting properties of the samples were evaluated by contact angle measurement. It is seen that, sulfonation at low temperatures and short time periods improve these two properties of the polypropylene surfaces. Sulfonation at high temperatures and long time periods however, cause the partial breakdown of the polymer by degradation. Noticeable color change due to the degradation and carbonization of the polypropylene films sulfonated at high temperature and long time were supported by the UV-Vis spectra of the samples. Mechanical properties of sulfonated PP films were investigated. Consequently, after the sulfonation process the mechanical properties of the PP films showed a general trend of decrease with sulfonation time for a given temperature and a very fast decrease at high temperature of sulfonation. Thermal characteristics were found by differential scanning calorimeter (DSC). Thermal analysis revealed that sulfonated PP film samples displayed an additional endothermic peak. The physical effects of the sulfonation

Suggestions

Synthesis and Characterization of Surface Sulfonated Polypropylene Films
Ecevit, Safiye Tuba; Aras, Leyla; Tincer, Teoman (Informa UK Limited, 2008-01-01)
The basic reseach on the surface sulfonation of polypropylene (PP) is very important for design of surfaces for higher functionalization. For this purpose, liquid-phase sulfonation of polypropylene surfaces at various temperatures and different time periods was performed using concentrated sulphuric acid. The physical and chemical changes produced by the sulfonation on the polypropylene surfaces were determined by contact angle measurements, mechanical analysis, UV-Vis spectroscopy, differential scanning ca...
Preparation and characterization of organoclay-polypropylene nanocomposites with maleic anhydride grafted polypropylene compatibilizer
Yılmaz, Şule Seda; Yılmazer, Ülkü; Department of Chemical Engineering (2011)
The aim of this study was to improve the mechanical properties “Moplen” EP300L which is a heterophase copolymer. Polymer blends and nanocomposites were prepared by melt compounding method in a twin screw extruder. Nanofil® 5 (N5) and Nanofil® 8(N8) were used as the organoclays, and maleic anhydride grafted polypropylene (M) was used as the compatibilizer. The effects of additive concentrations and types of organoclays on the morphology, mechanical and thermal properties were investigated. Organoclay loading...
Synthesis and surface modification of polyurethanes with chitosan for antibacterial properties
Kara, Filiz; AKSOY, EDA AYŞE; YÜKSEKDAĞ, ZEHRANUR; Hasırcı, Nesrin; AKSOY, SERPİL (2014-11-04)
Surface modification and providing antibacterial properties to the materials or devices are getting great attention especially in the last decades. In this study, polyurethane (PU) films were prepared by synthesizing them in medical purity from toluene diisocyanate and polypropylene ethylene glycol without using any other ingredients and then the film surfaces were modified by covalent immobilization of chitosan (CH) which has antibacterial activity. CH immobilized PU films (PU-CH) were found to be more hyd...
Numerical analysis of ablation process on a two dimensional external surface
Aykan, Fatma Serap; Dursunkaya, Zafer (2008-01-01)
The thermal response analysis of an ablative material on a two dimensional external surface is performed. The method considers the whole domain as one continuous computational domain, eliminating the necessity to check the starting and ending positions of the decomposition zone. The current study solves the decomposition of the material at high temperatures by using the nth order Arrhenius equation but excludes the removal of char from the surface due to mechanical erosion or phase change and considers that...
Synthesis and separation properties of B-ZSM-5 zeolite membranes on monolith supports
Kalıpçılar, Halil; Noble, RD; Falconer, JL (2002-12-01)
Alumina-coated, silicon carbide monoliths were used as supports for B-ZSM-5 zeolite membranes, which were synthesized by in situ hydrothermal crystallization. Both 2 turn x 2 mm (66 channels) and 4 mm x 4 mm (22 channels) monoliths with effective membrane area/volume ratios of 10.6 and 7.2 cm(2)/cm(3), respectively, were used. The membranes separated C-4 and C-6 hydrocarbon isomer vapor mixtures with high selectivities. The selectivities and permeances were comparable to tubular ZSM-5 membranes for butane i...
Citation Formats
S. T. Ecevit, “Synthesis and characterization of surface sulfonated polypropylene films,” M.S. - Master of Science, Middle East Technical University, 2004.