Rubber-Modified Epoxies

Verchére, D.; Sautereau, H.; Pascault, Jean‐Pierre; Moschiar, S. M.; Riccardi, C. C.; Williams, Roberto J. J.

doi:10.1021/ba-1993-0233.ch014

Cited by 43 publications

(15 citation statements)

References 23 publications

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“…ment obtained was much lower than those obAs deduced from these figures and also from Table tained for other rubber-containing epoxy mix-V, there were essentially no discernable differtures. 2,5 This was possibly a consequence of a poor ences between the morphologies of these mixprereaction between the mixed compounds. We wish to analyze these different casting possibilitures.…”

Section: Resultsmentioning

confidence: 99%

Influence of curing conditions on the morphology and physical properties of epoxy resins modified with a liquid polyamine

Franco¹,

Corcuera²,

Gavaldà³

et al. 1997

J. Polym. Sci. B Polym. Phys.

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Section: Resultsmentioning

confidence: 99%

Influence of curing conditions on the morphology and physical properties of epoxy resins modified with a liquid polyamine

Franco¹,

Corcuera²,

Gavaldà³

et al. 1997

J. Polym. Sci. B Polym. Phys.

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“…The reaction then slows and finally ceases before all of the monomer has been consumed. The cessation of polymerization prior to Effect of Cure Temperature total monomer consumption has been widely observed in the cure of glass-forming networks 23,26,29 To further investigate the curing kinetics, the vinyl ester resin was isothermally cured at a range and is due to diffusion control of the curing process when the glass transition temperature (T g ) of temperatures but with constant initiator concentration. Figure 7 shows the rate as a function approaches the curing temperature (T cure higher curing temperatures, the final degree of of reaction (over a period of 6 h).…”

Section: May Bementioning

confidence: 99%

Curing kinetics and thermal properties of vinyl ester resins

Cook

Simon

Burchill

et al. 1997

J. Appl. Polym. Sci.

158

112

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ABSTRACT:The curing kinetics of dimethacrylate-based vinyl ester resins were studied by scanning and isothermal DSC, gel time studies, and by DMTA. The rate of polymerization was raised by increased methyl ethyl ketone peroxide (MEKP) concentration but the cocatalyst, cobalt octoate, retarded the reaction rate, except at very low concentrations. By contrast, the gel time was reduced for all increases in either peroxide or cobalt concentration. This contradictory behavior was explained by a kinetic scheme in which the cobalt species play a dual role of catalyzing the formation of radicals from MEKP and of destroying the primary and polymeric radicals. The scanning DSC curves exhibited multiple peaks as observed by other workers, but in the present work, these peaks were attributed to the individual influence of temperature on each of fundamental reaction steps in the free radical polymerization. Physical aging appeared to occur during the isothermal polymerization of samples cured below the ''fully cured'' glass transition temperature (T g ). For these undercured materials, the difference between the DSC T g and the isothermal curing temperature was approximately 11ЊC. Dynamic mechanical analysis of a partially cured sample exhibited anomalous behavior caused by the reinitiation of cure of the sample during the DMTA experiment. For partially cured resins, the DSC T g increased monotonically with the degree of cure, and this dependence was fitted to an equation related to the Couchman and DiBenedetto equations.

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“…Cloud-point temperature increase, for a given composition of RLP/epoxy prepolymer, with the cess, an opposite effect should be observed. This mean molar mass of the epoxy was analyzed leads to believe that residence time evolution in by Verchere et al 9 They reported for a CTBN reactive extrusion is too complex to be examined 1 8/epoxy prepolymer blend that an increase of using only the nonreactive twin-screw extrusion the epoxy prepolymer molar mass from 349 to 383 modeling. grmol 01 leads to an increase of the precipitation temperature of 14ЊC.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, by reactive extrusion, of high molar mass epoxy prepolymers containing rubber preformed particles

Taha¹,

Perrut²,

Roche³

et al. 1997

J. Appl. Polym. Sci.

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High molar mass epoxy prepolymers containing rubber dispersions based on carboxyl-terminated butadiene-acrylonitrile random copolymer (CTBN) were prepared from initially miscible solution of low molar mass epoxy prepolymers, bisphenol A and CTBN-based rubber. During chain extension inside a twin-screw extruder due to epoxy-phenoxy and epoxy-carboxy reactions, a phase separation process occurs. Epoxy-phenoxy and epoxy-carboxy reactions were catalyzed by the triphenyl phosphine. The effect of reaction parameters (temperature, catalyst, reactant stoechiometry) on the reactive extrusion process were analyzed. The structure of the prepolymers showed low branching reactions (2-5%). Low molar mass prepolymers have a Newtonian rheological behavior. Cloud-point temperature of different reactive liquid butadiene acrylonitrile random copolymer (RLP)/epoxy resin blends were measured for different RLP concentrations. It was shown that rubber particles remain insoluble in a range of temperature from room temperature to 180ЊC, typical of temperatures used for epoxy curing reactions. Prepolymers containing different rubber concentrations were cured using dicyandiamide as the hardener. The practical adhesion of the issued networks to an aluminium alloy increased with rubber concentration.

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Rubber-Modified Epoxies

Cited by 43 publications

References 23 publications

Influence of curing conditions on the morphology and physical properties of epoxy resins modified with a liquid polyamine

Influence of curing conditions on the morphology and physical properties of epoxy resins modified with a liquid polyamine

Curing kinetics and thermal properties of vinyl ester resins

Synthesis, by reactive extrusion, of high molar mass epoxy prepolymers containing rubber preformed particles

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