Non‐isothermal curing of reactive plastics

Progelhof, R. C.; Throne, James L.

doi:10.1002/pen.760150910

Cited by 49 publications

(17 citation statements)

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“…If the mold temperature is too high, the time to peak exotherm is shortened at the expense of high internal temperature. In extreme cases, this temperature may reach the ignition point of the resin and may cause localized burning, especially if the resin is not highly filled (1). Even otherwise, at high mold temperatures, a large thermal gradient is set up across the thickness of the part; and ifthe mold is opened too soon, such gradients set up differential volumetric changes which, in turn, would result in internal stresses and possibly cracking.…”

Section: Results and Discussion Cure Cycle In The Moldmentioning

confidence: 99%

Effect of cure cycle on mechanical properties of thick section fiber‐reinforced poly/thermoset moldings

Mallick¹,

Raghupathi²

1979

Polymer Engineering & Sci

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One of the major factors of concern in compression molding of fiber‐reinforced thermosets is the mold cycle time which directly affects the processing cost. An ideal system would be the one which cures in a relatively short time resulting in excellent mechanical and physical properties. However, in practice, a compromise has to be made between the mold cycle time and ultimate property requirements. The effects of cure cycle time, temperature, preheating and post‐cooling on mechanical properties of continuous as well as chopped glass fiber reinforced polyester and vinyl ester systems involving 1/4 to 1 in thick sections have been studied. Mold cycle time is strongly influenced by the part thickness and mold temperature. Internal heat generation due to curing reaction causes high thermal gradients across the thickness. Preheating offers advantages of reducing both the mold cycle time and the thermal gradient. The flexural and interlaminar shear strengths are strongly dependent or, the mold cycle time. Maximum strengths are obtained when the mold is opened at the instant when there is no thermal gradient across the thickness.

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Section: Results and Discussion Cure Cycle In The Moldmentioning

confidence: 99%

Effect of cure cycle on mechanical properties of thick section fiber‐reinforced poly/thermoset moldings

Mallick¹,

Raghupathi²

1979

Polymer Engineering & Sci

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“…The high exothermicity of the curing reaction associated with the low conductivity of the material is a feature of fundamental importance. As a result, the curing reaction gives rise to high ially at the center, and high eveloped through the sample [1] [7] Several numerical modeling and experimental investigations have been performed on different problems particularly, on the at transfer and degree of cure [1]. The importance of the analyses of the rate of heat transfer up process is highly recognized to obtain a final product characterized by the desired mechanical properties or to realize defects free endNumerical modeling and simulation of the process of cure is of great importance from a theoretical point of view in order to gain a fuller insight into the nature of the cess, and from an experimental point of view, to optimize…”

Section: Materials Compositionmentioning

confidence: 99%

Comparism of Cure Modeling of Unsaturated Polyester Based Composites Using Microwave and Autoclave Assisted Hand Lay-Up Process in Cylinderical Mould

Adeodu¹

2015

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Abstract:Modeling of composite curing process is required prior to composite production as this would help in establishing correct production parameter and method of curing thereby eliminating costly trial and producing an effective method of curing a particular polymeric composite. The main objective of this work is to compare the difference between modeled microwave and conventional autoclave heating methods in producing polyester-aluminum and polyester-carbon black composites. This will establish the effectiveness of a curing method in the production of a particular polymer composite i. e, prediction of best possible trends during microwave and conventional autoclave heating with regards to effect of heating rate on degree of cure of the composites. The numerical models were constructed by taking into account heat transferred by electromagnetic energy (microwave) and heat transferred by conduction (conventional autoclave) through the resin/filler mixture, as well as kinetic heat generated by cure reaction. The numerical solution of the mathematical models presented were discretized using forward finite differences of the RungeKuta method and finally solved using MATLAB® Computer programming language. It was observed that curing of the samples was achieved faster in microwave than conventional autoclave method as microwave heat transfer by electromagnetic energy produces volumetric heat flow as compared to conventional autoclave whose heat transfer by conduction generates transverse heat flow to the samples. This implies that in the production process of polymer-matrix composites, electromagnetic energy through microwave was able to produce faster heating rate; thus, an effective method of curing in the production process of polymer-metal composites.

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“…Finally, the heat transfer through the wood by convection is small compared to the heat transfer by conduction. Accordingly, the law of conservation of energy may be written as [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] where T is the absolute temperature inside the material at the x, y coordinate, C, is the specific heat (defined below), L is the heat of reaction, Kx and K,, are the thermal conductivities in the x and y directions. ms is the mass per unit volume of the wood comprised of virgin (&dquo;active&dquo;) wood (mass per unit volume m a ) and of wood which can not pyrolyze further at the given temperature (&dquo;inactive&dquo; wood, or &dquo;char&dquo;, mass per unit volume mj m S, m and me vary with time as illustrated in Figure 1.…”

Section: The Modelmentioning

confidence: 99%

Mass Loss of and Temperature Distribution in Southern Pine and Douglas Fir in the Range 100 To 800°C

Springer

1983

Journal of Fire Sciences

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Southern pine and Douglas fir test specimens were placed in an over kept at either 100, 160, 245, 400, 600, or 800 °C, and the center point temperatures and the mass losses of the specimens were measured as functions of exposure time. A model is described for calculating the temperature distribution in and the mass loss of wooden beams having rectangular cross sections. Comparisons were made between the data and the results of the model, and reasonable agreements were found between the measured and calculated temperatures and mass losses. Some tests were also performed to assess the effect of ambient oxygen concentration on the mass loss.

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Non‐isothermal curing of reactive plastics

Cited by 49 publications

References 0 publications

Effect of cure cycle on mechanical properties of thick section fiber‐reinforced poly/thermoset moldings

Effect of cure cycle on mechanical properties of thick section fiber‐reinforced poly/thermoset moldings

Comparism of Cure Modeling of Unsaturated Polyester Based Composites Using Microwave and Autoclave Assisted Hand Lay-Up Process in Cylinderical Mould

Mass Loss of and Temperature Distribution in Southern Pine and Douglas Fir in the Range 100 To 800°C

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