Synthesis and characterization of surface sulfonated polypropylene films

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


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...
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...
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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...
A Study of Crystallization in Plasma Modified Polypropylene
Mansuroglu, Dogan; Mecit, Giray; Uzun Kaymak, İlker Ümit (2019-01-01)
A capacitively coupled radio-frequency plasma discharge is used to improve the surface properties of Polypropylene. The changes in the surfaces are investigated for various plasma discharge parameters. After the plasma modification, the polypropylene material transforms into a para-crystalline form and shows the properties of the monoclinic crystals dominantly, observed using the X-ray diffraction measurements. The results indicate significant improvements in the crystallinity after the plasma exposure. The...
Synthesis of Emulsion-Templated Acrylic-Based Porous Polymers: From Brittle to Elastomeric
Tunc, Yeliz; Hasırcı, Nesrin; ULUBAYRAM, KEZBAN (2012-01-01)
High internal phase emulsion polymers (PolyHIPEs) are novel materials that have high porosity and interconnected open-cell structure and are used in various applications such as supports for catalytic systems, media for separation of similar molecules, and scaffolds for tissue engineering. In this study, 90% porous acrylic based polyHIPE structures with various cellular structure and mechanical characteristics were developed by using stearyl acrylate (SA), isodecyl acrylate (IDA), isobornyl methacrylate (IB...
Citation Formats
S. T. Ecevit, “Synthesis and characterization of surface sulfonated polypropylene films,” M.S. - Master of Science, Middle East Technical University, 2004.