Mechanical behavior of tetrafunctional/phenol novolac epoxy mixtures cured with a diamine

Barral, L.; Cano, Jesús; López, J.; López‐Bueno, I.; Nógueira, P.; Abad, M. J.; Torres, A.; Ramı́rez, C.

doi:10.1002/1097-4628(20000906)77:10<2305::aid-app24>3.0.co;2-c

Cited by 21 publications

(19 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies showed autocatalytic mechanism for TGDDM/DDS composite curing [Cole et al, 1991;Nam et al, 1993;Barral et al, 1998]. The present study revealed the accelerating effect of MWCNTs on the epoxy curing reaction during the initial stage (autocatalytic nature), which decreased with increasing amounts of CNTs.…”

supporting

confidence: 61%

Epoxy-based Carbon Nanotubes Reinforced Composites

Pillai¹,

Ray²

2011

Advances in Nanocomposites - Synthesis, Characterization and Industrial Applications

View full text Add to dashboard Cite

supporting

confidence: 61%

Epoxy-based Carbon Nanotubes Reinforced Composites

Pillai¹,

Ray²

2011

Advances in Nanocomposites - Synthesis, Characterization and Industrial Applications

View full text Add to dashboard Cite

“…The first system is an epoxy fabricated from diglycidyl ether bisphenol A (DGEBA) resin and diethylenetriamine (DETA) hardener (Zhong 2014). The second system was cured from a combination of tetraglycidyl-4, 4'-diaminodiphenylmethane (TGDDM) and multifunctional novolac glycidyl ether (EPN) epoxies using a 4,4'-diaminodiphenylsulphone (DDS) hardener (Nogueira et al 2000;Barral et al 1998). A comparison of the calculated and experimental mechanical properties is given in Table 1.…”

Section: Validation Results and Discussionmentioning

confidence: 99%

Predictive Model for Tensile Properties of Carbon Fiber-Reinforced Polymers at Various Moisture Contents

Boon

Joshi

2016

Plastic and Polymer Technology

View full text Add to dashboard Cite

A model to estimate the tensile properties of carbon fiber-reinforced polymers (CFRP) based on their moisture contents and molecular structures is formulated and studied. In the proposed model, water molecules absorbed by polymers are considered congregated near the sub-micro-cavities within the polymers. The absorbed water molecules form hydrogen bonds with the polymer molecules and cause the regions around the sub-micro-cavities to have a reduced elastic modulus. The additive group contributions for polymers are used to determine the contributions of hydrophobic and hydrophilic functional groups separately. This enables the effects of water molecules on the mechanical properties of polymers to be quantified and estimated. For CFRP laminae, an additional effect of moisture on the fiber-matrix interface is considered in the calculation of the transverse tensile strength. The tensile properties are calculated using the proposed model agreed well with the experimental values. It is expected that the time and materials required to obtain the mechanical properties of CFRP exposed to humid environments can be reduced with the help of this model.

show abstract

“…Physical aging 8 refers to structural relaxation of the glassy state toward the metastable equilibrium amorphous state, and it is accompanied by the increase of glass transition temperature (Tg) and modulus of the epoxy system. 9,10 Chemical aging mainly includes chemical structure changes of polymer resulting from high temperature and oxygen. 8 PMCs oxidation is primarily a surface reaction phenomenon and preferential oxidation occurs along the fiber direction in unidirectional composites.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermo-oxidative aging on three-dimensional and four-directional braided carbon fiber/epoxy composite

Fan

Guo

2014

Journal of Composite Materials

View full text Add to dashboard Cite

An experimental study was performed to investigate the effect of high temperature exposure on flexural properties of the three-dimensional and four-directional braided carbon fiber/epoxy composite and the corresponding neat resin. For this purpose, samples were exposed to 90 C, 120 C, 150 C, and 180 C (below and above the glass transition temperature of the matrix resin) for various periods of time up to 13 days. The flexural properties combining with Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), weight loss, scanning electron microscope (SEM), and optical microscope analyses were performed on the unaged and aged samples. The results revealed that the thermo-oxidative behavior of the braided composite was significantly different from the neat resin. The flexural strength of the neat resin decreased dramatically due to the oxidation degradation of the sample surface when the aging temperature was equal to its glass transition temperature. The extensive degradations of both the matrix and the fiber/ matrix interface, especially for the interface, were responsible for the significant decrease in flexural strength of the braided composite. The flexural strength retention rates of the braided composite were higher than that of the neat resin after exposure to 90 C, 120 C and 150 C because the integral structure of the braided composite can make the fiber bear flexural force together although the matrix resin and the fiber/matrix interface had a certain degree of damage after longtime thermo-oxidative aging.

show abstract

Mechanical behavior of tetrafunctional/phenol novolac epoxy mixtures cured with a diamine

Cited by 21 publications

References 19 publications

Epoxy-based Carbon Nanotubes Reinforced Composites

Epoxy-based Carbon Nanotubes Reinforced Composites

Predictive Model for Tensile Properties of Carbon Fiber-Reinforced Polymers at Various Moisture Contents

Effect of thermo-oxidative aging on three-dimensional and four-directional braided carbon fiber/epoxy composite

Contact Info

Product

Resources

About