Physical aging of partially crosslinked RTM6 epoxy resin

Moosburger‐Will, Judith; Greisel, Michael; Horn, S.

doi:10.1002/app.41121

Cited by 18 publications

(18 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… for a brief list of articles that influenced this article). Mooseburger‐Will performed two recent studies describing the properties of partially cured RTM6 which are highly relevant to this work . At any given curing temperature, the resin starts out as a liquid where the viscosity increases with curing time until the resin reaches the gel state and has infinite viscosity.…”

Section: Resultsmentioning

confidence: 99%

“…Mooseburger-Will performed two recent studies describing the properties of partially cured RTM6 which are highly relevant to this work. 17,22 At any given curing temperature, the resin starts out as a liquid where the viscosity increases with curing time until the resin reaches the gel state and has infinite viscosity. The resin in the gel state is proposed to consist of one large interconnected molecular network with the unreacted epoxide and linker molecules in the interstices.…”

Section: Articlementioning

confidence: 99%

See 1 more Smart Citation

Curing cycle modification for RTM6 to reduce hydrostatic residual tensile stress in 3D woven composites

Gross

Jafari

Tsukrov

et al. 2016

J of Applied Polymer Sci

View full text Add to dashboard Cite

Triaxial residual tensile stresses resulting after cooling a 3D woven composite from the curing temperature cause cracking in the resin pockets for weave architectures that have high through‐the‐thickness constraint. We show how curing cycle modifications can reduce the hydrostatic tensile stress generated by thermal mismatch during cooling of Hexcel RTM6 epoxy resin constrained in a quartz tube which simulates extreme constraint in a composite. The modified curing schedule consists of a high temperature cure to just before the glass transition, a lower temperature hold that takes the resin through the glass transition thereby freezing in the zero stress state, followed by high temperature cure to bring the resin to full conversion. We show that this process is sensitive to heating rates and can reduce the zero stress state of non‐toughened RTM6 resin to a temperature similar to a commercial rubber‐toughened resin, Cycom PR520. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43373.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Articlementioning

confidence: 99%

Curing cycle modification for RTM6 to reduce hydrostatic residual tensile stress in 3D woven composites

Gross

Jafari

Tsukrov

et al. 2016

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…20,22 In case of a precure step performed in a separate molding tool, DSC scans were conducted in order to verify the nominal DOC before testing. 8,21,25,27 Most authors selected silicone as mold material 6,21,25,27 or a combination of a metallic mold with rubber inlay. 5,6 If precure step was performed inside the test device without unclamping, reaction kinetic models were used to correlate time and temperature with DOC.…”

Section: Methods For Reproducibility and Stability Analysismentioning

confidence: 99%

“…3 Due to the exothermic, autocatalytic reaction, partial cure is associated with inhomogeneities, caused by deviations from the nominal cure temperature, 4 and difficulties like uncontrolled post-cure. [5][6][7] In addition, aging 8 and humidity 9 influence the resin properties, and hence their stability, over time.…”

Section: Introductionmentioning

confidence: 99%

Aspects of reproducibility and stability for partial cure of epoxy matrix resin

Müller

Winkler

Gude

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

Partial cure of thermosets is a promising approach to enhance manufacturing possibilities of reinforced and unreinforced polymers. If partial cure is taken into consideration as a genuine process parameter, novel manufacturing technologies can be developed by exploiting the specific properties of incomplete polymer networks. A main concern in this context is to control the kinetic reaction avoiding inhomogeneous or instable degrees of cure. Based on a combination of numerical simulations and experiments, a methodology is presented that enables a systematic assessment of the reproducibility and stability of partial cure. Special attention is paid to the interaction of thermal boundary conditions and the cure kinetic of thick samples as well as the storability of partially cured resin under different conditions. Guidelines for cure cycle selection, mold design, and storage are derived. The possibility to use complex multistep cure schedules and extended storage periods is demonstrated for an unmodified noninhibited epoxy resin.

show abstract

“…The desired properties of the coating are acquired by thermal curing that induces polymerization. Different curing cycles and their effect on the elastic modulus, fracture toughness, impact resistance, and glass transition temperature of resins were studied by Wu et al Other authors delt with the polymer network formation kinetics and the partial crosslinking of epoxies used in industrial applications . Techniques used for epoxy processing can also be applied to polybenzoxazines.…”

Section: Introductionmentioning

confidence: 99%

A quantitative determination of the polymerization of benzoxazine thin coatings by time‐of‐flight secondary ion mass spectrometry

Pospisilova

Renaud

Poorteman

et al. 2019

Surface & Interface Analysis

View full text Add to dashboard Cite

Phenol-paraphenylenediamine (P-pPDA) benzoxazines exhibit excellent barrier properties, adequate to protect aluminum alloys from corrosion, and constitute interesting candidates to replace chromate-containing coatings in the aeronautical industry. For the successful application of P-pPDA coatings, it is necessary to decrease the curing temperature to avoid the delamination of the coating while preserving the mechanical properties of the alloy, as well as the barrier properties of the coating. However, decreasing the curing temperature leads to less polymerized films, the extent of which requires a quantitative assessment.While the conversion rate of the polymerization reaction is commonly evaluated for bulk samples using differential scanning calorimetry (DSC), a tool for its evaluation in thin films is missing. Therefore, a new approach was developed for that matter using time-of-flight secondary ion mass spectrometry (ToF-SIMS). The relation between the SIMS data integrated from inside thin films and the DSC results obtained on bulk samples with the same curing cycle allowed to calibrate the SIMS data. With this preliminary calibration of the technique, the polymerization of P-pPDA coatings can be locally determined, at the surface and along the depth of the coating, using dual-beam depth profiling with large argon cluster beam sputtering.

show abstract

Physical aging of partially crosslinked RTM6 epoxy resin

Cited by 18 publications

References 33 publications

Curing cycle modification for RTM6 to reduce hydrostatic residual tensile stress in 3D woven composites

Curing cycle modification for RTM6 to reduce hydrostatic residual tensile stress in 3D woven composites

Aspects of reproducibility and stability for partial cure of epoxy matrix resin

A quantitative determination of the polymerization of benzoxazine thin coatings by time‐of‐flight secondary ion mass spectrometry

Contact Info

Product

Resources

About