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Showing 1 to 20 of 43 for “"Epoxy Resins"”.
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The cure of and moisture ingress into epoxy resins
… project was to characterise the cure of several epoxy resin systems using dielectric spectroscopy, DSC, FT-IR spectroscopy and rheology measurements. It was hoped to build up an understanding of the cure process and correlate the results produced by the different methods to establish whether …
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Synthesis, properties, and morphology of lignin based epoxy resins
Star-like lignin-poly(propylene oxide) copolymers were prepared by chain-extending steam exploded lignins (tulipifera liriodendron) with propylene oxide and by subsequent endcapping with ethylene oxide. Epoxidation of these copolymers was carried out with epichlorohydrin at room temperature, using …
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Synthesis and characterization of vanillyl alcohol based thermosetting epoxy resins
… applications in high-performance thermosetting epoxy resins. Vanillyl alcohol, a lignin derived aromatic diol, is a potential platform chemical for the production of renewable bisphenols and epoxy thermosets. A new bio-based bisphenol (bisguaiacol) was synthesized via electrophilic aromatic …
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The fracture of epoxy resins and the effects of rubber inclusions
… and fracture behaviour of a rubber-modified epoxy, and that of-its unmodified counterpart has been studied. The materials have been examined both in 'bulk' and when used as a thin adhesive layer for bonding steel adherends. Values of fracture toughness, the type of crack growth and the …
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Film formation on precious metal surfaces in the presence of epoxy resins
… on film formation on metal surfaces exposed to epoxy resin. Epoxy rods were prepared from novolac hardened by 4-4' methylenedianiline (MDA). The curing and post curing temperatures were 60, 125 °C and 125, 160 °C. The composition of the epoxies used were 27.0 and 31. 5 parts (MDA) per 100 parts …
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Development Of Quantitative FT- IR Methods For Analyzing The Cure Kinetics Of Epoxy Resins
<p>Epoxy thermosets are important engineering materials with applications in coating, adhesives, packaging and as structural components in a variety of advanced engineering products. The ultimate performance of polymer critically depends upon the details of the cure chemistry used to produce the …
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Correlation of physical and chemical properties of anhydride-cured epoxy resins with theoretical structure
The structure of alicyclic dicarboxylic anhydrides was found to have a significant effect on the final physical and chemical properties of a cured epoxidized novolac resin, and the final properties of a cured system can be predicted with reasonable accuracy from the theoretical structure. …
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Cure Kinetics and Processing Parameters of Neat and Reinforced High Performance Epoxy Resins: Evaluation of Techniques
… glass fiber reinforced high performance epoxy prepreg composed of the tetrafunctional epoxy tetraglycidyl 4,4-diaminodiphenyl methane (TGDDM), the tetrafunctional amine curing agent 4,4-diaminodiphenylsulfone (DDS) and an ionic initiator/accelerator, are determined by various thermal …
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Hydrogen bonding as it relates to miscibility of high performance poly(arylene ether)s with epoxy resins
… rich functional groups for use as tougheners in epoxy thermosets followed by evaluation of the miscibility of the poly(arylene ether) materials in cured epoxy thermosets. Poly(arylene ether)s were synthesized by reaction of bisphenol A with a variety of dihalo monomers including 4,4’ …
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Topographic and Surface Chemical Aspects of the Adhesion of Structural Epoxy Resins to Phosphorus Oxo Acid Treated Aluminum Adherends
… mechanisms responsible for durable adhesion of epoxy resins to phosphorus oxo acid treated aluminum alloys. By systematically altering the adherend surface chemistry, surface topography, and adhesive formulation, combined with accelerated testing, the chemical and mechanical factors that …
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Part I: Synthesis of Aromatic Polyketones Via Soluble Precursors Derived from Bis(A-Amininitrile)S; Part Ii: Modifications of Epoxy Resins with Functional Hyperbranched Poly(Arylene Ester)s
… successfully used to modify inherently brittle epoxy resins. The hyperbranched polymers were chemically incorporated into the epoxy networks using triphenylphosphine (TPP) as a catalyst and 4,4'-diaminodiphenyl sulfone (DDS) as a curing agent. The chemistry and the proper formation of …
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Some molecular contributions and curing considerations: Physical properties of thermoset network materials
… (1) processing thick section prepreg epoxy materials, (2) characterization of the contributions to rubbery elastic behavior and (3) improved epoxy resins through lightly cross-linked stiff molecular backbones.
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Modification, curing and flame retardation of epoxy resin networks
… flame retardance of di- and higher functionality epoxy resins were investigated. The influence of curing temperature and time on morphological development and fracture behavior was also studied. Arylamine functionalized poly(arylene ether sulfone)s of controlled molecular weight were synthesized …
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All-atom and Coarse-grained Molecular Dynamics Modeling of Various Polymeric and Composite Materials
… polyetherimide (PEI)-graphene composites, and epoxy network polymers, by bridging molecular-level behaviors and macroscopic thermomechanical properties. First, all-atom MD simulations are used to improve the design of porous carbon fibers derived from PAN-b-PMMA copolymers for energy storage …
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Design of unique composites based on aromatic thermosetting copolyesters
… to those of conventionally used high temperature epoxy resins. ATSP shows a unique capability for healing of interlaminar cracks on application of heat and pressure, via the Interchain Transesterification Reaction (ITR). ITR can also be used for reduction in void volume and healing of microcracks. …
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Polyhydroxyethers synthesis, analysis and crosslinking
Epoxy resins are used throughout the commercial field as coatings and adhesives. Commercially, these polymers are generally synthesized via the "Taffy Process" which involves the reaction of 4,4′ isopropylidene diphenol (Bis-A) with epichlorohydrin under basic conditions. They may also synthesized …
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Phase morphology and fracture toughness of CNT/polytherimide modified epoxy polymer nanocomposites as matrices for advanced CFPR composites
Thermosetting epoxy resins are extensively utilised as matrices for advanced carbon fibre reinforced polymer (CFRP) composites. Their relatively high stiffness, strength, glass transition temperature (Tg), and strong bonding to the reinforcing fibres, together with their ease of processing, are …
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Nanostructured thermoset resins and nanocomposites containing hyperbranched blockcopolyether liquid rubbers and organophilic layered silicates
… improvement of materials properties of thermoset resins by the use of tailor-made additives. Inorganic nanofillers derived from layered silicates as well as functional liquid polymers of various architectures were used alone or in combination to tailor different properties, such as thermal …
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Cavitation erosion of engineering materials
… and tool steels. The plastic employed were epoxy resins. These were supplied in two different formulations the "Novalac" and the Bisphenol" systems. They were produced in as cast and machined conditions. Thus the influence of both the formulation and the production processes on their …
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