Materials With Improved Properties From Polymer-Ceramic Nanocomposites

1999 ◽  
Vol 576 ◽  
Author(s):  
Frank-Dieter Kuchta ◽  
Piet J. Lemstra ◽  
Andrew Keller ◽  
Lawrence F. Batenburg ◽  
Hartmut R. Fischer
Keyword(s):  
Clay Minerals ◽  
Crystallization Rate ◽  
Layered Silicate ◽  
Research Field ◽  
Polymer Chains ◽  
Homogeneous Distribution ◽  
Modified Clay ◽  
Organically Modified ◽  
Important Field ◽  
Silicate Layers

ABSTRACTIn order to link the fundamental research field of polymer crystallization with the technical important field of composite materials polymer-layered silicate nanocomposites from polyethylene (PE) are prepared and their morphology and properties are investigated. The effect of an external confinement introduced by highly anisotropic silicate layers of organically modified clay minerals on crystal growth and nanocomposite properties has been studied. The prepared nanocomposites of organically modified clay minerals and PE exhibit not only a homogeneous distribution of individual silicate layers but also of tactoids. The isothermal crystallization rate of PE in the corresponding nanocomposite at 120 °C is increased in the composite material due to the action of the silicate layers. A significant effect on crystal phase has not been observed so far but from X-ray experiments, however the crystal size seems to be influenced. The thermal stability of the nanocomposites is significantly enhanced and the decomposition mechanism has been changed due to the presence of the layered silicates within the host polymer acting as a barrier for the diffusion of small molecules like oxygen. Due to the none permanent attachment of the polymer chains to the silicate surface the thermal-mechanical properties are only moderately enhanced at low temperature while the glass transition temperature remains unaffected.

Polymer Crystallization Studied in Confined Dimensions using Nanocomposites from Polymers and Layered Minerals

2000 ◽  
Vol 628 ◽  
Author(s):  
Frank-Dieter Kuchta ◽  
Piet J. Lemstra ◽  
Andrew Keller ◽  
Lawrence F. Batenburg ◽  
Hartmut R. Fischer
Keyword(s):  
Layered Silicate ◽  
Polymer Crystallization ◽  
Research Field ◽  
Elastic Behavior ◽  
Homogeneous Distribution ◽  
Lamellar Thickness ◽  
Experimental Conditions ◽  
Polyamide 11 ◽  
Crystalline Polymers ◽  
Silicate Layers

ABSTRACTPolymer-layered silicate nanocomposites from polyamide-11 (PA-11) were prepared and the morphology and properties have been investigated in order to link the fundamental research field of polymer crystallization with the technical important field of composite materials. Semi-crystalline polymers are known to crystallize in different phases (e. g. monoclinic, hexagonal) forming chain-folded lamellar crystals. Depending on experimental conditions (e. g. temperature, pressure) the crystal size (lamellar thickness) affects the stability of these phases. The incorporation of layered silicates acting as hard walls into semi-crystalline polymers opens new possibilities to: i) study polymer crystallization in confined dimensions, and ii) provide materials from commodity or engineering polymers with enhanced properties. The effect of an external confinement introduced by highly anisotropic silicate layers of organically modified clay minerals on crystal growth and nanocomposite properties has been studied. The composites are prepared by in situ polycondensation of polyamides and/or blending via melt extrusion. The nanocomposites exhibit a homogeneous distribution of individual silicate layers at low clay contents. The lamellar thickening growth is reduced in polyamide crystallization due to the external constrained of the silicate layers in the host polymer. Furthermore these nanocomposites show a slightly enhanced thermal stability, tensile modulus and an increased elastic behavior over a broader temperature range. No distinct glass transition has been observed at highest clay contents.

Mechanical properties and structure of solvent processed novolac resin/layered silicate: development of interphase region

RSC Advances ◽  
2015 ◽  
Vol 5 (98) ◽  
pp. 80875-80883 ◽  
Author(s):  
Parisa Jahanmard ◽  
Akbar Shojaei
Keyword(s):  
Mechanical Properties ◽  
Layered Silicate ◽  
Novolac Resin ◽  
Modified Clays ◽  
Interphase Region ◽  
Organically Modified ◽  
Mixing Method ◽  
Silicate Layers

It was shown that the solution mixing method is able to disperse natural and organically modified clays in novolac resin efficiently. Development of a strong interphase region around the silicate layers was also explored.

Polyamide 11/Clay Nanocomposite Using Polyhedral Oligomeric Silsesquioxane Surfactants

2015 ◽  
Vol 1110 ◽  
pp. 65-68 ◽  
Author(s):  
Sheng Qin Wang ◽  
Mohit Sharma ◽  
Yew Wei Leong
Keyword(s):  
Polyhedral Oligomeric Silsesquioxane ◽  
Layered Silicate ◽  
Polymer Chains ◽  
Polyamide 11 ◽  
Mechanical And Physical Properties ◽  
Silicate Clay ◽  
Silicate Layers ◽  
Oligomeric Silsesquioxane ◽  
Matrix Nanocomposites ◽  
Polymer Matrix Nanocomposites

This paper reports polyamide 11 (PA11)/layered silicate (clay) nanocomposite using polyhedral oligomeric silsesquioxane (POSS) surfactants. POSS functionalized with amino, ammonium and guanidinium groups were synthesized and used to facilitate the intercalation of polymer chains between silicate layers thereby to improve the dispersion of clay in polymer matrix. Nanocomposites from the blends of POSS-modified clay and PA11 were thus formulated via melting compounding and their mechanical and physical properties were characterized.

Asymmetric mixed matrix membrane incorporating organically modified clay particle for gas separation

2014 ◽  
Vol 241 ◽  
pp. 495-503 ◽  
Author(s):  
A.K. Zulhairun ◽  
A.F. Ismail ◽  
T. Matsuura ◽  
M.S. Abdullah ◽  
A. Mustafa
Keyword(s):  
Gas Separation ◽  
Clay Particle ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Modified Clay ◽  
Organically Modified

Use of polysaccharide based surfactants to stabilize organically modified clay particles aqueous dispersion

2013 ◽  
Vol 94 (1) ◽  
pp. 687-694 ◽  
Author(s):  
Manja Kurečič ◽  
Majda Sfiligoj Smole ◽  
Karin Stana-Kleinschek
Keyword(s):  
Aqueous Dispersion ◽  
Clay Particles ◽  
Modified Clay ◽  
Organically Modified

Bio-based Polyurethane-clay Nanocomposite Foams: Systheses and Properties

2009 ◽  
Vol 1188 ◽  
Author(s):  
Min Liu ◽  
Zoran S. Petrovic ◽  
Yijin Xu
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Cell Structure ◽  
Polyurethane Foams ◽  
Mechanical And Thermal Properties ◽  
Cell Content ◽  
Modified Clay ◽  
Rigid Polyurethane Foams ◽  
Nanocomposite Foams ◽  
Organically Modified

AbstractStarting from a bio-based polyol through modification of soybean oil, BIOH™ X-210, two series of bio-based polyurethanes-clay nanocomposite foams have been prepared. The effects of organically-modified clay types and loadings on foam morphology, cell structure, and the mechanical and thermal properties of these bio-based polyurethanes-clay nanocomposite foams have been studied with optical microscopy, compression test, thermal conductivity, DMA and TGA characterization. Density of nanocomposite foams decreases with the increase of clay loadings, while reduced 10% compressive stress and yield stress keep constant up to 2.5% clay loading in polyol. The friability of rigid polyurethane-clay nanocomposite foams is high than that of foam without clay, and the friability for nanofoams from Cloisite® 10A is higher than that from 30B at the same clay loadings. The incorporation of clay nanoplatelets decreases the cell size in nanocomposite foams, meanwhile increases the cell density; which would be helpful in terms of improving thermal insulation properties. All the nanocomposite foams were characterized by increased closed cell content compared with the control foam from X-210 without clay, suggesting the potential to improve thermal insulation of rigid polyurethane foams by utilizing organically modified clay. Incorporation of clay into rigid polyurethane foams results in the increase in glass transition temperature: the Tg increased from 186 to 197 to 204 °C when 30B concentration in X-210 increased from 0 to 0.5 to 2.5%, respectively. Even though the thermal conductivity of nanocomposite foams from 30B is lower than or equal to that of rigid polyurethane control foam from X-210, thermal conductivity of nanocomposite foams from 10A is higher than that of control at all 10A concentrations. The reason for this abnormal phenomenon is not clear at this moment; investigation on this is on progress.

Preparation and Characterization of Ionic Liquild Modified Clay and its Application in Polypropylene/Clay Nanocomposites

2011 ◽  
Vol 55-57 ◽  
pp. 1588-1592
Author(s):  
Li Mei Wang
Keyword(s):  
Clay Nanocomposites ◽  
X Ray Diffraction ◽  
Modified Clay ◽  
Solution Blending ◽  
Organically Modified ◽  
Result Show ◽  
Xrd Patterns ◽  
Clay Layers ◽  
Poly Propylene

Clay was organically modified with one kind of ionic liquild. Organical clay obtained was used to prepare poly(propylene) (PP)/clay nanocomposites by solution blending. Flourier transform infrared (FTIR), wide-angle X-ray diffraction (XRD) and thermogravimetric analysis (TGA) revealed that the ionic liquild was loaded in the galleries of organically modified clay. TGA result show the thermal stability of organically modified clay was superior to clay. XRD patterns indicated that the d-spacing of clay layers increased to 2.96 nm from 1.22 nm of clay. XRD patterns of PP/clay nanocomposites show that clay layers were dispersed in PP matrix by nanometer size.

Biodegradable Polyester / Layered Silicate Nanocomposites

2002 ◽  
Vol 740 ◽  
Author(s):  
Pralay Maiti ◽  
Carl A. Batt ◽  
Emmanuel P. Giannelis
Keyword(s):  
Mechanical Properties ◽  
Storage Modulus ◽  
Layered Silicate ◽  
Layered Silicates ◽  
Melt Extrusion ◽  
Biodegradable Polyester ◽  
Modified Montmorillonite ◽  
Organically Modified Montmorillonite ◽  
Silicate Nanocomposites ◽  
Organically Modified

ABSTRACTNanocomposites of α-hydroxy polyester, polylactide (PLA) and β-hydroxy polyester, polyhydroxybutyrate (PHB) with layered silicates have been successfully prepared by melt extrusion of PLA and PHB with organically modified montmorillonite (MMT) and fluoromica. The mechanical properties of the nanocomposites are improved compared to the neat polymers. Storage modulus increase up to 40% compared with the pure polymers by adding only 2–3 wt% nanoclay. Biodegradation can be controlled by the choice of the nanoclay used.

Application of Organically Modified Clay in Removing BTEX from Produced Water

2020 ◽  
Author(s):  
Sepideh Nasrollahpour ◽  
Daryoush Yousefi Kebria ◽  
Mohammad Ghavami ◽  
Omid Ghasemi-Fare
Keyword(s):  
Produced Water ◽  
Modified Clay ◽  
Organically Modified
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