Degree of Cure, Heat of Reaction, and Viscosity of 8552 and 977-3 HM Epoxy Resin

Ng, SuXiu; Boswell, Robert F.; Claus, Steven J.; Arnold, F. E.; Vizzini, Anthony J.

doi:10.21236/ada377439

Cited by 22 publications

(23 citation statements)

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“…The kinetic constants in the cure relation were chosen to fit calorimetic (differential scanning calorimetry, DSC) data obtained by Ng et al 6 for the 8552 Figure 5 Model prediction of temperature dependence of 40 kHz loss modulus EЉ.…”

Section: Kinetics Of Curementioning

confidence: 99%

Modeling of ultrasonic processing

Roylance

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Zukas

et al. 2004

J of Applied Polymer Sci

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Curing of fiber-reinforced thermoset polymer composites requires an elevated temperature to accelerate the crosslinking reaction and also hydrostatic pressure to consolidate the part and suppress the formation of voids. These processing conditions can be provided by autoclaves of appropriate size, but these are expensive and sometimes difficult to schedule. Ultrasonic debulking followed by oven cure is an attractive alternative to autoclave cure. In this technique a movable "horn" driven at ultrasonic frequency is applied to the surface of the uncured part. This generates pressure and at the same time produces heating by viscoelastic dissipation. The part can be debulked to net shape and staged through the action of the ultrasound. There are a large enough number of experimental parameters in ultrasonic debulking and staging to make purely empirical process optimization difficult, and this paper outlines numerical simulation methods useful in understanding and developing the process.

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Section: Kinetics Of Curementioning

confidence: 99%

Modeling of ultrasonic processing

Roylance

Player

Zukas

et al. 2004

J of Applied Polymer Sci

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“…Among the process parameters, curing conditions have a substantial influence on producing highly cross-linked matrices, decreasing the residual stress and strain between the reinforcement and matrix materials, and reducing the void content in composite structure [4,5]. Thus, several methods have been developed to establish optimum cure cycle to reach the desired structural performance [6][7][8][9][10][11]. Mechanical testing, is based on measurement of variations in a specific mechanical property by applying different cure regimes, is one of the most common and conventional methods used in the optimization of curing parameters [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Curing Conditions on the Mechanical Properties of Silica-Phenolic Composites: A Comprehensive Study

Güney¹,

Demirkesen²

2015

International Advanced Research Journal in Science, Engineering

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Determination of optimum curing conditions provides quality assurance in the production of high performance composite materials. To this end, many techniques have been developed for monitoring and controlling the variables of the curing process. In this study, the effect of several curing parameters, including curing temperature, curing period and curing pressure on the mechanical properties of silica-phenolic composites were investigated. Commercially available high silica fabric and a heat reactive, resole type phenolic resin (SC1008) were used in the production of composite laminates. After the impregnation step, the laminates were cured utilizing hot press under various cure conditions. The mechanical properties of the high-silica phenolic composite laminates were characterized in terms of tensile, combined loading compression, flexural and hardness (Shore D) tests. The densities and void contents of the composite laminates were measured using Archimedes principle. The results confirmed that both fibre and matrix dominated mechanical properties of the silica phenolic composites were affected by the curing process during composite manufacturing. Optimum curing conditions for this silica-phenolic composite system was determined as 1h at 165° C under a pressure of 8 bars.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] For example, Kim and coworkers 4 studied the cure kinetics of AS4/3501-6 (graphite/epoxy) prepreg. They found the ultimate reaction heat of prepreg was 8 -17% less than the neat resin.…”

Section: Introductionmentioning

confidence: 99%

“…There are several experimental techniques to characterize thermoset and prepreg, such as DSC, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Near-infrared spectroscopy, 15,16 FTIR, 10,18 -20 and UVreflection spectroscopy. 18,21 DSC is the most widely utilized experimental technique to obtain the degree and reaction rate of cure of thermosetting resins.…”

Section: Introductionmentioning

confidence: 99%

Cure kinetics of T700/BMI prepreg used for advanced thermoset composite

Guo

Zhang

et al. 2005

J of Applied Polymer Sci

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ABSTRACT:A new isothermally based, cure kinetic model for the prepreg was presented using an industrially supplied prepreg rather than pure resin. The matrix resin was bismaleimide (BMI) resins, and the reinforcement was carbon fiber T700 -12S. The BMI prepreg was measured from 170 to 220°C by isothermal DSC. The isothermal cure reaction heat increases with the increment of cure temperature. The DSC data were analyzed by the proposed nthorder reaction model. An increase in reaction rate was observed at higher temperature in both neat and prepreg. After reaching the peak value, the reaction rate dropped off faster in prepreg, resulting in a lower average value of the ultimate heat of reaction. It was suggested the presence of carbon fiber had an effect on the cure kinetics as a heat sink. The carbon fibers imposed restrictions on the molecular mobility of the reactive species and did not change the cure mechanism.

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Degree of Cure, Heat of Reaction, and Viscosity of 8552 and 977-3 HM Epoxy Resin

Cited by 22 publications

References 0 publications

Modeling of ultrasonic processing

Modeling of ultrasonic processing

Influence of Curing Conditions on the Mechanical Properties of Silica-Phenolic Composites: A Comprehensive Study

Cure kinetics of T700/BMI prepreg used for advanced thermoset composite

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