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Showing 1 to 20 of 135 for “"Polyamide"”.
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Polyamide-imide and Montmorillonite Nanocomposites
… suspensions of a high performance polymer, Polyamide-imide (PAI) are widely used in magnetic wire coatings. Here we investigate the effect that the introduction of montmorillonite (MMT) has on PAI. MMT was introduced into an uncured PAI suspension; the sample was then cured by step-wise heat …
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Chain Extension of Polyamide-6 & Polyamide-6/Organoclay Nanocomposites. Control of thermal degradation of polyamide-6/organoclay nanocomposites during extrusion using a novel chain extender
Novel solutions to offset thermal degradation of polyamide-6 (PA-6) and organoclay (organically modified layered silicates) nanocomposites during melt compounding have been investigated. In this research, a novel chain extender (Joncryl ADR 3400) has been used to improve thermal stability of PA-6 …
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Characterization of Thermoplastic Polyamide Composite Matrix Material
… a representative matrix resin, the J1-polymer (a polyamide) proposed by DuPont. The research was conducted in parallel with related studies, primarily by other personnel, of graphite fiber/J1-polymer unidirectional composites.
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Thermal and oxidative degradation of an aromatic polyamide
The thermal oxidation of an aromatic polyamide fibre, namely poly(m-xylylene adipamide) has been investigated. The volatile and non-volatile products of oxidation identified using T.L.C., H.P.L.C. and G.C.-M.S. include homologous series of monocarboxylic acids, dicarboxylic acids, n-alkyl amines, …
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Synthesis and characterization of polydimethylsiloxane-polyamide segmented copolymers
The polyamide poly(ε-caprolactam) or "nylon 6" is a very important fiber forming polymer which finds many applications in the carpet industry and elsewhere due to the very high strength of this fiber. However, a major drawback is its hydrophilicity. This feature influences both the surface and bulk …
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High temperature nanofoams based on ordered polyamide matrices
Polyimides are one class of high temperature materials that have been extensively used in the microelectronics industry in passivation and protection. The extremely good thermal stabilities, along with desirable mechanical and electrical properties, have led to their use in integrated circuits and …
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Structure-Property Relationships of Polyisobutylene-Block-Polyamide Thermoplastic Elastomers
… as a soft block in combination with a polyamide hard block has been investigated for use in TPE synthesis. While the material showed some promising behavior, many properties were still below those of the commercially standard TPE material Pebax.</p> <p>Polyisobutylene and polyamide …
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Development and characterization of dendrimeric NF/RO polyamide membranes
Item withdrawn by Laura Spradlin (lspradl2@illinois.edu) on 2014-01-24T14:14:50Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Martinez Saenz de Jubera_Ana.docx: 9222947 bytes, checksum: 443ea8b453c942240f8efa7f833c1a02 (MD5) Martinez Saenz de …
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Nanofiltration membranes modified with aromatic polyamide dendrimers active layers
… dendritic architectures. Amphiphilic aromatic polyamide dendrimers (G1-G3) are synthesized via a divergent approach and used for membrane modification by direct percolation. The permeate samples collected from the percolation experiments are analyzed by UV-Vis spectroscopy to instantly monitor …
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Synthesis of functionalized polyamide 6 by anionic ring-opening polymerization
… synthesis of thermally more stable fluorinated polyamide 6 having a hydrophobic surface; (ii) the synthesis of polyamides 6 bearing pendant cinnamoyl groups, which are thermo- and photoresponsivechromophore groups, and demonstrating their reversible crosslinking as well as improved …
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Thermodynamics of Polyamide Separation Membrane in Contact With Aqueous Solutions
… of relative humidity. Water solubility in polyamide active layer is 12 wt% at a relative humidity of 95%. The slope of a water concentration versus humidity curve can be used to calculate inter-diffusivity of water in polyamide active layers. By combining the measurements of water mass …
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Investigating the characterisation and stability of polyamide 6,6 in heritage artefacts
… The differentiation of silk and synthetic polyamide can pose particular problems for curators of historic textiles due to the similarities in their visual appearance. NIR spectroscopy coupled with multivariate analysis is investigated for the differentiation of the polyamide sub?classes, …
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Synthesis and characterisation of polyamide 6 blends made by reactive extrusion
… twin-screw extruder for the preparation of polyamide 6. An optimised extruder screw and barrel configuration was used during reactive extrusion process to permit necessary feeding, mixing, devolatilising and pumping requirements. Various screw speeds and barrel temperature profiles were also …
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Effects of fiber type on the tribological behavior of polyamide composites
… Glass, aramid, and carbon fiber-filled polyamide (Nylon 6,6) composites serve as models for understanding friction and wear processes encountered when polymer composites are used in tribological applications. Experimental results not only include measurements of friction and wear, but …
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Modification of polyamide thin film composite reverse osmosis membrane for water desalination
… without creating defects in cross-linking of polyamide layer. The best performing quantum composite membrane exhibited better performance in term of water flux and salt rejection when compared to that of nanocomposite and composite membranes. As a concept, thin film quantum dots composite …
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Growth dynamics, charge density, and structure of polyamide thin-film composite membranes
… dynamics of the interfacial polymerization of polyamide for thin-film composite reverse osmosis membranes using diffuse reflectance spectroscopy, Rutherford backscattering spectrometry (RBS), and atomic force microscopy (AFM); (2) quantifying the effects of trimesoyl choride (TMC) and …
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Scalable Synthesis and Separation Performance of Covalent Organic Framework and Contorted Polyamide Membranes
… and chemical and thermal stability. Contorted polyamide TFC membranes are also a new class of polymeric membranes suitable for enhanced RO water desalination due to their increased free volume resulting from sterically hindered monomer structures. COF and contorted polyamide membranes show …
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Improvements to Polyamide Reverse Osmosis Membranes for Removal of Small, Neutral, Hydrophilic Solutes
Potable water supplies around the world are under stress. Since 1950 the world population has nearly tripled, while current evidence suggests that conventional potable water supplies are shrinking. One technology with the ability to tap into new potable water sources, such as municipal wastewater, …
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Scalable Synthesis and Separation Performance of Covalent Organic Framework and Contorted Polyamide Membranes
… and chemical and thermal stability. Contorted polyamide TFC membranes are also a new class of polymeric membranes suitable for enhanced RO water desalination due to their increased free volume resulting from sterically hindered monomer structures. COF and contorted polyamide membranes show …
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Magnetic polyamide 6 nanocomposites for increasing damage tolerance through self-healing of composite structures.
Self-healing materials have the ability to repeatedly repair damages that occur before complete failure of materials. The development of stimuli-responsive self-healing materials has been in demand recently for composite structures, since their failure is relatively uncertain and can result in …
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