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Maleimide modified epoxy compounds were prepared through reacting N-(4-hydroxylphenyl)maleimide (HPM) with diglycidylether of bisphenol-A. Triphenylphosphine and methylethylketone were utilized in the reactions as a catalyst and a solvent, respectively. The resulting compounds possessed both oxirane ring and maleimide group. The kinetics of the curing reactions of the maleimide-epoxy compounds and...
In order to improve the heat resistance of a cured epoxy resin together with reducing the viscosity of the resin composition, an epoxy resin was cured with a curing agent formed from the radical copolymerization of vinyl monomers during the cure process of the epoxy resin. N-phenylmaleimide and p-acetoxystyrene were used as vinyl monomers of the curing agent. The epoxy resin was cured by the insertion...
The cure kinetics of epoxy resin systems was investigated according to the change of curing agents, and analyzed in respect of the network structure. An autocatalytic cure reaction can be shown in the epoxy resin systems with phenol novolac hardener regardless of the kinds of epoxy resin and the epoxy resin systems using Xylok and dicyclopentadiene type phenol resin curing agents follow nth-order...
New silicon-containing epoxy compounds were obtained by reacting a bisphenol-A type epoxy and an o-cresol-formaldehyde novolac type epoxy with diphenylsilandiol and triphenylsilanol, respectively. The reactions were performed with tin(II) chloride as a catalyst at 140-170 o C. With various feeding ratios of reactants, the epoxy compounds contained various silicon contents. The thermal stability...
An approach to chemical recycling of epoxy resin was pursued. Bisphenol F type epoxy resin cured with 1,8-p-menthanediamine could be completely decomposed in nitric acid solution resulting from low corrosion resistance to nitric acid. Organic decomposed products of the resin with the highest yield were extracted from neutralized solution. The extract was repolymerized to prepare recycled resin, mixed...
Triphenyl phosphate (TPP) and its analogs are known to be the most effective flame retardant for acrylonitrile–butadiene–styrene copolymer (ABS) among various phosphorus-based compounds. But, its evaporation temperature is quite lower than the processing temperature of ABS. Therefore, it is inevitable to avoid a considerable amount of TPP to evaporate during processing. In order to overcome this undesirable...
In order to give a toughness and improve adhesion properties of the cured epoxy system, modified epoxy resins, which have pre-reacted urethane microspheres formed using dynamic vulcanization method in liquid diglycidylether of bisphenol A, were prepared. It was found that the size of the particles decreased to sub-micro order with increase in solubility of urethane oligomers in epoxy resin, and coefficient...
In this work, a methodology has been developed for construction of atomistic models of crosslinked polymer networks. The methodology has been applied to low molecular weight water soluble epoxy resins crosslinked with different curing agents that are being considered for use as a primer coating on steel. The simulations allowed the crosslink density and the amount of free crosslinking sites in the...
Intercrosslinked network of siliconized epoxy-1,3-bis(maleimido)benzene matrix systems have been developed. The siliconization of epoxy resin was carried out by using various percentages of (5-15%) hydroxyl-terminated polydimethylsiloxane (HTPDMS) with γ-aminopropyltriethoxysilane (γ-APS) as crosslinking agent and dibutyltindilaurate as catalyst. The siliconized epoxy systems were further modified...
The effect of curing conditions such as time and temperature on the morphology developed in a diglycidyl ether of bisphenol-A epoxy resin cured with diamino diphenyl methane, and modified with 15wt% poly(methyl methacrylate), has been investigated. The reacting mixtures were precured at 80 o C for a period of time ranging from 2 to 7h, afterwards they were cured at 140 o C and finally...
Thermoset/thermoplastic elastomer (TPE) blends of poly(propylene glycol) (PPG)-type epoxy resin (ER) and a diblock copolymer, polystyrene-b-polybutadiene (SB, with 30% styrene content), were prepared using 4,4'-diaminodiphenylmethane (DDM) as curing agent. The miscibility and thermal transition behavior of DDM-cured ER/SB blends were investigated by differential scanning calorimetry (DSC) and dynamic...
Two kinds of reactive toughening accelerators for epoxy resin, amine-terminated chain-extended urea (ATU) and imidazole-terminated chain-extended urea (ITU) were synthesized from polyurethane prepolymer. Compared with the unmodified system, the curing activity, dynamic mechanical behavior, impact property and fracture surface morphology of the modified systems were systematically investigated. Results...
Organic/inorganic hybrids containing 4- to 19.8wt% of silica were synthesized from an epoxy resin diglycidyl ether of bisphenol-A (DGEBA) and a γ-glycidoxypropyltrimethoxysilane (GPTMS) or a tetramethylorthosilicate (TMOS) by utilizing a sol/gel process. In the DGEBA/GPTMS hybrids, the storage modulus in the rubbery region increased and the peak area of the tanδ curves in the glass transition region...
The results of the study of a completely miscible thermosetting polymer blend containing a crystallizable component are reported. Blends of poly(ϵ-caprolactone) (PCL) and bisphenol-A-type epoxy resin (ER) cured with 4,4′-methylenebis(3-chloro-2,6-diethylaniline) (MCDEA) were prepared and compared with blends of PCL with uncured bisphenol A-type epoxy resin, i.e. diglycidylether of bisphenol A (DGEBA)...
The thermomechanical properties of DGEBA/TETA resins are analysed as a function of the irradiation dose. Irradiation by electrons results in a decrease of the glass transition temperature and the elastic modulus in the rubbery region. The Arrhenius diagrams obtained for the various doses show that the cooperative mobility associated with the α relaxation becomes faster after the irradiation. More...
This paper examines the effect of the addition of PSF upon the final properties and network structure of the TGAP/DDS system after cure and post-cure. It also compares the differences in the network structure and properties of the modified system between samples in which the epoxy resin and thermoplastic had been prereacted and those which had been simply mixed together. The thermal properties of...
A novel phosphorus-containing novolac (DOPO-PN) from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and 4-hydroxyl benzoaldehyde was obtained via simple addition reactions. The chemical structure of the obtained DOPO-PN was characterized with FT-IR, 1 H and 31 P NMR and elemental analysis. The DOPO-PN novolac, with multi-phenol groups in the molecular chain, was used...
Thermosetting polymer blends of poly(ethylene oxide) (PEO) and bisphenol-A-type epoxy resin (ER) were prepared using 4,4′-methylenebis(3-chloro-2,6-diethylaniline) (MCDEA) as curing agent. The miscibility and crystallization behavior of MCDEA-cured ER/PEO blends were investigated by differential scanning calorimetry (DSC). The existence of a single composition-dependent glass transition temperature...
The polymerisation kinetics for IPNs formed from a model vinyl ester resin (VER) and an imidazole-cured epoxy resin (DGEBA) has been studied by scanning DSC and isothermal FTIR. The chemical interactions between the VER initiating system (either cumene hydroperoxide, CHP; methyl ethyl ketone peroxide, MEKP; benzoyl peroxide, BPO; or azobisisobutyronitrile, AIBN) and the epoxy curative (1-methyl imidazole,...
In situ copolymerization of diglycidyl ether of 4,4'-dihydroxybiphenol (DGE-DHBP) with diglycidyl ether of bisphenol F (DGEBP-F) networks using an anhydride curing agent has been investigated. DGEBP-F is a commercial epoxy while cured DGE-DHBP shows liquid crystal transitions. Curing kinetics are determined using differential scanning calorimetry (DSC). The data were fitted using an autocatalytic...
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