Physiorheological characterization of a carbon/epoxy prepreg system

Dusi, Mark R.; Galeos, R. M.; Maximovich, M. G.

doi:10.1002/app.1985.070300506

Cited by 17 publications

(6 citation statements)

References 1 publication

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“…Conversely, if the laminate has been over‐cured, it results in the brittle matrix, which is then susceptible to crazing under stress 15. Researchers17 have been utilized and recommended differential scanning calorimetry (DSC) to determine the degree of cure and for developing cure cycles of thermosetting resin and prepregs. DSC can measure the heat flow required to maintain a sample at a given temperature, thus providing information on cure and reactions 18…”

Section: Introductionmentioning

confidence: 99%

Determination of optimum cure parameters of 977‐2A carbon/epoxy composites for quickstep processing

Khan¹,

Iqbal

Hussain

et al. 2013

J of Applied Polymer Sci

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In this study polymer-matrix composite has been processed using autoclave and Quickstep techniques. A phenomenological approach was adopted for the optimization of cure cycle for Quickstep of an aerospace grade epoxy composite (Cycom 977-2A carbon/epoxy prepregs). Though there are reports concerning the processing and properties of materials using Quickstep technique, little work has been reported on the design of optimized cure cycle for Quickstep processing based on rheology, ultrasonic testing, and mechanical characterization. A step by step account is provided in this study, describing the introduction, balancing and combination of isothermal dwell periods and temperature ramps in order to control the resin viscosity. All the panels manufactured were qualitatively assessed using ultrasonic C-scan and afterwards fiber and void content, panel thickness, flexural strength, and interlaminar shear strength (ILSS) were assessed and compared with those obtained from traditional autoclave-and oven-cured laminates. The Quickstep panel properties produced from optimized cure cycle was superior to oven curing and was comparable with autoclave.

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Section: Introductionmentioning

confidence: 99%

Determination of optimum cure parameters of 977‐2A carbon/epoxy composites for quickstep processing

Khan¹,

Iqbal

Hussain

et al. 2013

J of Applied Polymer Sci

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“…Equation ( 9) is the empirical five-parameter model of viscosity for the nth (n≠1) order reaction introduced by Dusi [6]. The first and nth order viscosity models express viscosity as an exponential function of the cure time.…”

Section: Rheology Model Viscosity Modelmentioning

confidence: 99%

“…The first and nth order viscosity models express viscosity as an exponential function of the cure time. The first and nth viscosity models have been frequently used in the rheological analysis of the cure process (Dusi et al [6]; Theriault et al [7]; Wang et al [8]). These models do not incorporate the effect of gelation on the viscosity and the predication accuracy is not good.…”

Section: Rheology Model Viscosity Modelmentioning

confidence: 99%

The Rheological Properties of Isothermal Curing of DGEBA/ TETA Epoxy System

Razak¹,

Saleh²,

Emad³

2015

ETJ

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In this study viscosity ) η ( of diglycidyl ether of bisphenol A / triethylenetetramine (DGEBA/TETA) system were measured through curing using a Brookfield viscometer at four different temperatures (30, 45, 60 and 80) °C. The measurements were carried out for two hardener/resin ratios (13 and 20) phr. The gel time was calculated for each hardener/resin ratio formulation; from the viscosity experimental data. The results showed that the gel time decrease with increasing curing temperature for each hardener/resin ratio formulation. Viscosity profiles were described by a model based on the Boltzmann function. The fitted results agreed well with the experimental values.

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“…Conversely, if the laminate is over‐cured, it may result in the brittle matrix susceptible to crazing under stress . Many researchers have used and recommended differential scanning calorimetry (DSC) to determine the degree of cure and for developing cure cycles of thermosetting resin and prepregs. The thermal technique can measure the heat flow required to maintain a sample at a given temperature, so providing the information on cure and reactions .…”

Section: Introductionmentioning

confidence: 99%

Cure characterization of Cycom 977‐2A carbon/epoxy composites for quickstep processing

Khan¹,

Kausar

Hussain

et al. 2013

Polymer Engineering & Sci

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In this effort, Quickstep, a relatively a new technique, have been employed for manufacturing of composite materials. The cure schedule provided by a prepreg manufacturer is usually designed for autoclave or other traditional processing techniques and thermosetting resin systems are formulated for ramp rate curing 2-3 K min 21 . While in case of Quickstep processing, ramp rates of 15 K min 21 can be achieved, thus changing the chemorheology of resin. The cure process of 977-2A carbon/epoxy composites was evaluated for Quickstep processing using differential scanning calorimetry (DSC), dynamic mechanical and thermal analysis, and Fourier transformed infrared and results were compared with cure cycle employed for autoclave curing. Optimum hold time for Quickstep processing at upper curing temperature (180 C) was determined using DSC. The hold time of 120 min at 180 C was found to be suitable for Quickstep cure cycle, producing a panel of similar degree of cure to that achieved through autoclave processing schedule. Final degree of cure was dependent on time spent at upper cure temperature and slightly on initial steps of the cure cycle which was used to control the resin flow, fiber wetting, and void removal. Quickstep processed samples exhibited higher T g and crosslink density and similar molecular network structure to the autoclave cured samples. POLYM. ENG. SCI.,

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Physiorheological characterization of a carbon/epoxy prepreg system

Cited by 17 publications

References 1 publication

Determination of optimum cure parameters of 977‐2A carbon/epoxy composites for quickstep processing

Determination of optimum cure parameters of 977‐2A carbon/epoxy composites for quickstep processing

The Rheological Properties of Isothermal Curing of DGEBA/ TETA Epoxy System

Cure characterization of Cycom 977‐2A carbon/epoxy composites for quickstep processing

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