Results 171 to 180 of about 4,266 (210)
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A DMTA study of the fuel resistance of elastomers
Thermochimica Acta, 1993Abstract One of the major factors that determines the useful lifetime of a polymeric material is the chemical resistance of the polymer to its environment. Knowledge of the chemical resistance of gasket materials to their environment is critical as their failure leads to downtime for the system and increased maintenance costs, as well as fire and ...
John A. Hiltz +2 more
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A contribution to the interpretation of polymer viscoelasticity in DMTA testing
Polymer Bulletin, 2009Some ideas relevant to the prevailing viscoelasticity interpretations of dynamic mechanical thermal analysis (DMTA) experiments are presented. The main aspect is the inclusion of kinetic energy and inertia as variables, seeing the relaxing mass constantly increasing during strain, assigning inertial variation and not viscosity to energy dissipation ...
Cleuza Maria Wasilkoski +2 more
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DMTA Analysis of Propellants Based on Inert and Energetic Binder Systems
Key Engineering Materials, 2002Pedro N Simões
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Study of the Cross-Linking Process of Model Oligoesters by DMTA Method
Molecular Crystals and Liquid Crystals, 2008Some oligoesters were synthesized in order to study changes of the useful properties of hyper-branched unsaturated polyesters. The determination of the polymer relaxation properties allows for characterization of their structure. Useful properties of the polymers such as stability and persistence depend on their structure.
Sławomir Maślanka, Anna Sułkowska
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The DmtA methyltransferase contributes to Aspergillus flavus conidiation, sclerotial production, aflatoxin biosynthesis and virulence [PDF]
Scientific Reports, 2016 AbstractDNA methylation is essential for epigenetic regulation of gene transcription and development in many animals, plants and fungi. We investigated whether DNA methylation plays a role in the development and secondary metabolism of Aspergillus flavus, identified the DmtA methyltransferase from A.
Kunlong Yang +2 more
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DMTA investigation of solvents effects on viscoelastic properties of porous CaCO3-SBR latex composites [PDF]
Mechanics of Materials, 2012 The impact of water, linseed oil and mineral oil solvents on the viscoelastic properties of calcium carbonate-caboxylated styrene buradiene (CaCO 3-SBR) porous coatings has been investigated using a dynamic mechanical thermal analysis (DMTA) technique in
Martti Toivakka
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A dynamic mechanical thermal analysis (DMTA) study of polyethylenes
Thermochimica Acta, 1991Abstract Differences in mechanical α and β relaxations for a family of six polyethylenes (PE) are discussed in terms of structural variations and immobilization of amorphous chains. An amorphous contribution has been identified in the α transition of high density polyethylenes (HDPE). Further, low density polyethylenes (LDPE) with long chain branches
Hongjian Sha +2 more
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Molecular dynamics of elastomers investigated by DMTA and the NMR-MOUSE ®
Colloid & Polymer Science, 2002A series of elastomers, consisting of different polymers and crosslink densities, is investigated by dynamic-mechanical thermal analysis (DMTA) and NMR relaxation in an inhomogeneous field by the NMR-MOUSE®. A broad range of molecular mobilities and therefore variation in the glass transition temperature is covered by use of polymers with different ...
Herrmann, Volker +3 more
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The glass transition of amylopectin measured by DSC, DMTA and NMR
Carbohydrate Polymers, 1992Abstract The glass transition in amorphous amylopectin derived from waxy maize starch, and containing between 10 and 22% water, has been studied using differential scanning calorimetry, dynamic mechanical thermal analysis, the Instron texturometer and nuclear magnetic resonance (both pulsed and solid state NMR).
M.T. Kalichevsky +4 more
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A Low Modulus Adhesive Characterization by Means of DMTA Testing
The Journal of Adhesion, 2012The main objective of this paper is to investigate a way to characterize experimentally the mechanical behavior of low modulus adhesives. In this context, the relaxation and complex moluli master curves of a SIKAFLEX® 505 adhesive are obtained by means of dynamic mechanical thermal analysis. Firstly, the procedure carried out to prepare and to validate
Jon García-Barruetabeña +2 more
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