Abstract Novel type hydrogel‐clay nanocomposites based on the acrylamide (AAm)‐ 2‐acrylamido‐ 2‐methylpropane sulfonic acid (AMPS) sodium salt and clay were synthesized via in situ copolymerization aqueous solution. Samples characterized by determining total basic group (TGB) content swelling degree, XRD analysis, FTIR spectroscopy. Effects of monomer ratio amount properties samples investigated. It was found that hydrogel/clay exhibited improved capacity compared with hydrogels. used to...

Ali Durmusa*, Ahmet Kaşgöza & Christopher W. Macoskob a Faculty of Engineering, Department Chemical Engineering , Istanbul University Avcilar, Istanbul, Turkey b and Materials Science Minnesota Minneapolis, MN, USA

Abstract In this study, melt‐crystallization behaviors of poly(butylene terephthalate) (PBT) composites including different types inorganic fillers were investigated. Composite samples having 5 wt % prepared by melt processing in a twin screw extruder using commercial grades calcite (CA), halloysite (HL), and organo‐montmorillonite (OM) as filler. Depending on the filler type geometry, crystallization kinetics was studied differential scanning calorimetry (DSC) methods. Effect nonisothermal...

Abstract In this study, cold and melt crystallization behaviors of amorphous poly(ethylene terephthalate) (PET)/clay nanocomposites were investigated. Two nanocomposite samples with the same amount inorganic content prepared by processing using natural montmorillonite (Na‐MMT) organo‐modified (org‐MMT). Depending on clay structure, dispersion into PET behavior studied X‐ray diffraction differential scanning calorimetry methods, respectively. Effects structure organic groups between layers in...

ABSTRACT The purpose of this study is the preparation hydrolytically degradable copolymers waste poly(ethylene terephthalate) (PET). To achieve this, we modified PET by using biodegradable poly(lactic acid) (PLA). Modification reactions were carried out in o-nitrophenol as solvent at 140 and 170°C for 8, 16, 24 h presence dibutil tin oxide (DBTO) catalyst. amount total polymers (PLA PET) reaction mixture was 30% weight, weight ratios PLA/PET 10/90, 50/50, 90/10. These products characterized...

In this study, microstructural features and physical properties of thermoplastic polyurethane (TPU)/organoclay nanocomposites films prepared via melt blending (MB) solution mixing (SM) methods were investigated in detail. Amount organoclay into the composition varied range 2 8 wt%. Microstructural samples characterized by X-ray diffraction, scanning electron microscopy (SEM), transmission (TEM) methods. It was found that layers exhibited better dispersion, exfoliated, semi-exfoliated...

In this study, poly(butylene terephthalate) (PBT)/halloysite composites having various amounts of halloysite, as a one-dimensional (1D) nanotubular alumina-silicate filler, were prepared by melt processing in twin screw extruder. Nonisothermal crystallization behaviors the samples studied DSC and XRD methods. The effect halloysite amount on nonisothermal kinetics PBT was analyzed with kinetic models, namely Ozawa, Avrami modified Jeziorny, Liu–Mo. Crystallization activation energies...

Acrylamide-maleic acid (AAM-MA) hydrogels having high group content prepared with different maleic ratios were used for the removal of Cu(II) and Pb(II) ions from aqueous solutions in competitive noncompetitive conditions. The effects pH, time, initial metal ion concentration on adsorption capacity investigated. isotherm models applied experimental data it is shown that Freundlich equation was best model while Langmuir one ion. stability constants acrylamide-maleic hydrogel-Cu(II) complexes...

Abstract Formation of SiO 2 –B O 3 gel fibers and oxides was investigated by the sol‐gel method using tetraacetoxysilane (TAS) boron tri‐ n ‐butoxide (BTB). Low molecular weight borosiloxanes (BS) were formed reaction TAS with BTB in THF. Partial alkoxylation hydrolysis BS followed further condensation resulting polymer (PBS) solutions led to formation highly polymerized polyborosiloxanes (HPBS) good spinnability. Gel obtained dry spinning HPBS. The compositions PBS gels not consistent that...

In this work, structurally enhanced hydrogel nanocomposites based on 2-acrylamido-2 methyl propane sulfonic acid (AMPS)-acrylamide (AAM) copolymer with high hydrophilic group content were prepared by in-situ copolymerization using different types of clay (montmorillonite, mica and halloysite). Nanocomposite hydrogels characterized Fourier-Transform Infrared Spectroscopy (FTIR) X-ray diffraction (XRD) analyses determination swelling degrees the samples. Mechanical properties samples also...

Abstract In this study, two different thermoplastic polyurethanes (TPUs), a poly(ester)‐based TPU including aromatic diisocyanate units (TPU1) and poly(ester‐ether)‐based aliphatic (TPU2) were blended with cyclic olefin copolymer (COC) elastomer to prepare TPU‐rich blend films via melt compounding in twin screw extruder equipped slit die film casting rollers. Morphological features viscoelastic properties of characterized scanning electron microscope analysis, test protocols rheology...

A method for preparing SiO2 MxOy (M=Ti, Sb, V, Zr, Sn) thin films and monolithic gels was investigated. The reaction of silicic acid (SA) with metal chlorides or oxychlorides in organic solvents gave homogeneous solutions. Transparent gel were obtained by dip-coating a glass substrate aging the solutions polyethylene beaker, respectively. Heat treatment yielded oxide thickness from 0.1 to 0.4μm transmittance above 90%.

A precursor for borosilicate fibers was prepared by a new method via polyborosiloxane (PBS) condensation polymerization of silicon tetraacetate (STA) with boron trialkoxide (BTA). spinnable polymer obtained from PBS partial alkoxylation, subsequent hydrolysis, and aging various time periods.

Abstract In this study, a new method for low temperature oxide deposition is discussed. Silicon dioxide was formed on silicon from silicic acid solution by using spin-on technology. Mechanical and planarizing properties of the were investigated. Using metal–silicon dioxide-wafer (MOS) structure manufactured. Breakdown field strength trap density MOS capacitance measured. The discussed in paper shows very carbon contamination risk does not suffer crack formation. It therefore suitable variety...