The Analysis of Variance.

Synthesis and application of epoxy resins: A review

https://ir.nctu.edu.tw:443/bitstream/11536/14909/1/000297489400002.pdf

POSS related polymer nanocomposites

Effects of resin hydrophilicity on water sorption and changes in modulus of elasticity.

Can nanoparticles really enhance thermal stability of polymers? Part I: An overview on thermal decomposition of addition polymers

The characteristics of sorption and diffusion of water in an amine-cured epoxy system based on tetraglycidyl diaminodiphenylmethane and a novolac glycidyl ether resin were studied as a function both of the polymer microstructure, known from previous works, and the temperature. Water-sorption experiments and dynamic mechanical analysis (DMA) were performed. Tensile stress–strain and Rockwell hardness tests were conducted to investigate the effects of absorbed water on the mechanical properties of the material. Competing effects of the sorption of water in the free volume and of strong interactions between water molecules and polar groups of the network were used to explain the diffusional behavior observed, which followed Fick's second law. DMA analysis seemed to be sensitive to the water effects and the viscoelastic behavior was related both to the water-sorption processes and to the microstructure of the system. An important impact of water uptake on the tensile properties at break was also appreciated. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 71–80, 2001

Effect of water sorption on the structure and mechanical properties of an epoxy resin system

Using dynamic mechanical analysis (DMA) we have studied thermal degradation for a system containing a diglycidyl ether of bisphenol A (DGEBA) and 1,3-bisaminomethylcylohexane (1,3-BAC). The changes of dynamic mechanical properties during thermal degradation indicated a shift of the glass transition temperature (Tg) to higher temperatures and a decrease in the peak value of the dynamic loss factor (tan δ) with an increasing of aging time. The value of dynamic storage modulus (E′) at the rubbery state showed an increase with aging time, whiteE′ at the glassy state only underwent a moderate change with increased thermal degradation. From these results it can be argued that thermal degradation during the stage prior to the onset of the severe degradation involves structural changes in the epoxy system, as further crosslinking and loss of dangling chains in the crosslinked network.

Dynamic mechanical analysis

Epoxy/POSS organic–inorganic hybrids: ATR-FTIR and DSC studies

Thermodegradation kinetics of a hybrid inorganic–organic epoxy system

Using differential scanning calorimetry (DSC), we have studied, under isothermal and dynamic conditions, the kinetics of the cure reaction for an epoxy resin based on the diglycidyl ether of bisphenol A (DGEBA) modified with different contents of acrylonitrile-butadiene-styrene (ABS) and cured with 1,3-bisaminomethylcyclohexane (1,3-BAC). Kinetic analysis were performed using three kinetic models: Kissinger, Flynn-Wall-Ozawa, and the phenomenological model of Kamal as a result of its autocatalytic behavior. Diffusion control is incorporated to describe the cure in the latter stages, predicting the cure kinetics over the whole range of conversion. The total heats of reaction were not influenced by the presence of ABS. The autocatalytic mechanism was observed both in the neat system as well as in its blends. The reaction rates of the blends and the maximum conversions reached did not change too much with the ABS content. Blending ABS within the epoxy resin does not change the reaction mechanism of the epoxy resin formation.

Carmen Ramírez

Papers

Effect of water sorption on the structure and mechanical properties of an epoxy resin system

Dynamic mechanical analysis

Epoxy/POSS organic–inorganic hybrids: ATR-FTIR and DSC studies

Thermodegradation kinetics of a hybrid inorganic–organic epoxy system

Kinetic studies of the effect of ABS on the curing of an epoxy/cycloaliphatic amine resin