Production and characterization of nanocomposite materials from recycled thermoplastics

Karabulut, Metin
Nanocomposites are a new class of mineral-field plastics that contain relatively small amounts (<10%) of nanometer-sized clay particles. The particles, due to their extremely high aspect ratios (about 100-15000), and high surface area (in excess of 750-800 m2/g) promise to improve structural, mechanical, flame retardant, thermal and barrier properties without substantially increasing the density or reducing the light transmission properties of the base polymer. Production of thermoplastic based nanocomposites involves melt mixing the base polymer and layered silicate powders that have been modified with hydroxyl terminated quaternary ammonium salt. During mixing, polymer chains diffuse from the bulk polymer into the van der Waals galleries between the silicate layers. In this study, new nanocomposite materials were produced from the components of recycled thermoplastic as the matrix and montmorillonite as the filler by using a co-rotating twin screw extruder. During the study, recycled poly(ethylene terepthalate), R-PET, was mixed with organically modified quaternary alkylammonium montmorillonite in the contents of 1, 2, and 5 weight %. Three types of clays were evaluated during the studies. For comparison, 2 weight % clay containing samples were prepared with three different clay types, Cloisite 15A, 25A, 30B. The nanocomposites were prepared at three different screw speeds, 150, 350, 500 rpm, in order to observe the property changes with the screw speed. Mechanical tests, scanning electron microscopy and melt flow index measurements were used to characterize the nanocomposites. The clay type of 25A having long alkyl sidegroups gave the best results in general. Owing to its branched nature, in nanocomposites with 25A mixing characteristics were enhanced leading to better dispersion of clay platelets. This effect was observed in the SEM micrographs as higher degrees


Production of graded porous polyamide structures and polyamide-epoxy composites via selective laser sintering
Jande, Yusufu A. C.; Erdal Erdoğmuş, Merve; Dağ, Serkan (SAGE Publications, 2014-06-01)
Selective laser sintering was used for producing uniformly porous and graded porous polyamide structures. The porous structures were infiltrated with epoxy to produce composites. The porous and composite specimens were physically and mechanically characterized. Within the capabilities of the selective laser sintering machine and the materials used, porosities in the range 5-29% could be obtained in a controlled, repeatable manner. The ultimate tensile strength of the produced uniformly porous polyamide stru...
Fabrication of microporous ceramics from ceramic powders of quartz-natural zeolite mixtures
San, O; Abali, S; Hoşten, Çetin (Elsevier BV, 2003-01-01)
The possibility of producing ceramic powders suitable for the fabrication of microporous filters was investigated through the thermal treatment of the powder mixtures of a high-purity (99.09% SiO2) quartz and clinoptilolite type of natural zeolite. The quartz and zeolite, mixed in the ratio of 3:1 by weight, was wet ground in a ball mill, the powder was sieved on a 90-mum screen, and the undersize was dried and sintered in the powder form at the temperatures of 1000, 1100 and 1200degreesC for 7 h in an air ...
Geri kazanılmış termoplastiklerden nanokompozit malzemelerin üretilmesi ve karakterizasyonu
Yılmazer, Ülkü(2004-02-28)
Nanokompozit malzemeler oldukça az miktarda (%<10) nano boyutlarda kil parçacıkları içeren mineral dolgu maddeli plastiklerdir. Parçacıklar çok yüksek boyut oranlarına (yaklaşık 100-15000) ve yüksek yüzey alanına (750-800 m2/g) sahip oldukları için baz polimerin yoğunluk ve ışık geçirme özelliklerini fazla etkilemeden mekanik, ateşe dayanıklılık, ısısal ve geçirmezlik özelliklerini iyi yönde etkilerler. Nanokompozit üretim işlemi polimeri ve hidroksil-sonlu kuarterner amonyum tuzu ile etkileştirilmiş silika...
AKINOKTEM, G; TINCER, T (Wiley, 1994-11-21)
Thermal and flow properties of perlite-filled high-density polyethylenes (HDPE), studied in the first part of the paper, are discussed. Maximum peak temperatures of endotherms (T-mp) and the corresponding relative peak heights were examined by differential scanning calorimetry (DSC). The data obtained from a Brabender torque rheometer were evaluated to find the melt viscosities at low shear rate during preparation of perlite-HDPE composites. The filler concentration, types of HDPEs, and the use of gamma-APS...
Synthesis and Structural Characterization of Multifunctional Ti Alloy: Gum Metal
Elçin, Orkun; Mekhrabov, Amdulla O.; Akdeniz, Mahmut Vedat (null; 2018-10-27)
A relatively new class of ȕ-phase having a body-centered cubic structure Ti alloy termed multifunctional titanium alloy (MFTA) or ‘Gum Metal’ with the composition of Ti-23Nb-07Ta-2Zr-O (mole %) has been shown to possess many interesting properties such as superplasticity at room temperature without extensive work hardening. In the heavily deformed state, it also possesses an ultra-low elastic modulus, ultra-high strength, large elasticity, and Elinvar and Invar properties. In this study, we have synthesized...
Citation Formats
M. Karabulut, “Production and characterization of nanocomposite materials from recycled thermoplastics,” M.S. - Master of Science, Middle East Technical University, 2003.