New method for estimating the extent of curing of thermosetting prepregs

Sabzevari, Seyed Mostafa; Alavi-Soltani, Seyed R.; Minaie, Bob

doi:10.1002/app.33616

Cited by 5 publications

(5 citation statements)

References 27 publications

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“…Previous studies have shown that the final DOC and T g are predominantly affected by curing temperatures . According to DiBenedetto, the DOC and T g have a strong interrelationship: T g increases proportionally with the DOC.…”

Section: Correlationsmentioning

confidence: 99%

“…The T g ‐DOC relationship obtained in this study is slightly different than the one obtained in a previous study. Sabzevari et al showed experimental results for a nonlinear T g ‐DOC relationship and DiBenedetto model for a wide range of DOC and T g . However, the T g ‐DOC relationship in Sabzevari's study for DOC ranging from 0.35 to 0.83 shows an almost linear fit, as also obtained in this study.…”

Section: Correlationsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of postcure temperature variation on hygrothermal‐mechanical properties of an out‐of‐autoclave polymer composite

Vora

Minaie

2013

J of Applied Polymer Sci

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The effects of cure temperature variation on the properties of an out-of-autoclave polymer composite manufactured using Cycom 5320 8HS prepreg were investigated using different postcure temperatures of a two-stage cure cycle. In addition, the effects of adverse environmental conditions on the cure temperature variation were studied by conditioning the samples in an environmental chamber until they reached moisture equilibrium. The state of cure was obtained using a differential scanning calorimeter and dynamic mechanical analyzer. The mechanical properties were obtained using short-beam shear (SBS) and combined loading compression (CLC) test methods. The state of cure obtained showed increases in total heat of reaction, degree of cure, and glass transition temperature as the postcure temperature increased. The SBS and CLC strengths showed an increasing trend as postcure temperature increased. Good correlations were obtained between the material's cure temperatures, state of cure, and mechanical properties for room temperature dry and hot wet conditions. The study showed that the state of cure can be used to define, monitor, and verify the cure quality.

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Section: Correlationsmentioning

confidence: 99%

Section: Correlationsmentioning

confidence: 99%

Effects of postcure temperature variation on hygrothermal‐mechanical properties of an out‐of‐autoclave polymer composite

Vora

Minaie

2013

J of Applied Polymer Sci

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“…Figure 1. Effects of postcure temperature on glass-transition temperature of resin matrix T g is dominantly affected by curing temperature [23][24][25] . There is a significant dependence of the T g on the molecular weight of the polymer.…”

Section: Resultsmentioning

confidence: 99%

Effects of postcure temperature on mechanical properties of resin mineral composite for precision machine tool

Zhang¹,

Zhang²,

Yin³

et al. 2015

Proceedings of the 2015 International Conference on Applied Science and Engineering Innovation

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Resin mineral composite has drawn much attention in the field of elementary machine components due to its excellent damping property. The effects of postcure temperature on mechanical properties of resin mineral composite were investigated in this paper. Research results showed that the glass-transition temperature of resin matrix, the surface hardness of resin matrix, the compressive strength of resin matrix, and the compressive strength of resin mineral composite increased with the increasing postcure temperature. If the postcure temperature increased from 30℃ to 120℃, the compressive strength of resin mineral composite increased by 17.34%, the compressive strength of resin matrix increased by 6.67%, the surface hardness of resin matrix increased by 54.16%, and the glass-transition temperature of resin matrix increased by 49.09%. The postcure process at 120℃ for 4 hours can be used to improve the mechanical properties as a mature post-treatment technology for resin mineral composite. Good correlations were obtained between glass-transition temperature of resin matrix and surface hardness of resin matrix, compressive strength of resin matrix, and compressive strength of resin mineral composite. The correlations showed that the glass-transition temperature of resin matrix can be used to define and monitor the mechanical properties of resin mineral composite.

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“…18 Since T g mark a physical change in state of the material, it can be accurately determined by either dynamic mechanical analyzer (DMA) or encapsulated sample rheometer (ESR). Similar to degree of cure, glass transition temperature is an important parameter in defining the state of cure.…”

Section: Cure Cyclesmentioning

confidence: 99%

“…Similar to degree of cure, glass transition temperature is an important parameter in defining the state of cure. 18 Since T g mark a physical change in state of the material, it can be accurately determined by either dynamic mechanical analyzer (DMA) or encapsulated sample rheometer (ESR). In this work, to correlate glass transition temperature with the mechanical properties, DMA was used to determine the T g using three point bending clamp according to ASTM D7028-07.…”

Section: Cure Cyclesmentioning

confidence: 99%

Evolution of mechanical properties during cure for out‐of‐autoclave carbon‐epoxy prepregs

Vora

Islam

et al. 2014

J of Applied Polymer Sci

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Extent of cure and rheological properties were obtained for out-of-autoclave materials, Cycom 5320-8HS and Cycom 5320-PW, for the manufacturer recommended cure cycle using differential scanning calorimeter and encapsulated sample rheometer (ESR), respectively. Rheological properties from ESR were further used in designing the cure cycles to study the evolution of mechanical properties. Five panels were cured at different cure stages using the designed cure cycles and coupons were tested for short beam shear and combined loading compression properties at different cure stages. To correlate the mechanical properties with its respective glass transition temperature, dynamic mechanical analyzer was used to obtain the glass transition temperature for the coupons obtained from the respective panels. Statistical results showed significant difference in short beam shear and combined loading compression properties up to vitrification, however, no significant difference was observed on these mechanical properties after vitrification. The observed linear trend between degree of cure (DOC) and glass transition temperature (T g ) was validated using DiBenedetto relation. Linearly increasing trend between DOC and glass transition temperature (T g ) for different cure states suggests that both DOC and T g can be used interchangeably to define the state of material. A good correlation was observed between material cure state and the mechanical properties. A mathematical model was also proposed to determine the short beam shear and combined loading compression properties based on material cure state.

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New method for estimating the extent of curing of thermosetting prepregs

Cited by 5 publications

References 27 publications

Effects of postcure temperature variation on hygrothermal‐mechanical properties of an out‐of‐autoclave polymer composite

Effects of postcure temperature variation on hygrothermal‐mechanical properties of an out‐of‐autoclave polymer composite

Effects of postcure temperature on mechanical properties of resin mineral composite for precision machine tool

Evolution of mechanical properties during cure for out‐of‐autoclave carbon‐epoxy prepregs

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