FTIR isothermal cure kinetics and morphology of dicyanate ester resin/polysulfone blends

Recalde, Ileana; Recalde, Dagmar; Garcı́a-Lopera, Rosa; Gómez, Clara M.

doi:10.1016/j.eurpolymj.2005.05.027

Cited by 37 publications

(26 citation statements)

References 36 publications

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“…It have been demonstrated in other studies that the formation of intermediate by-products during cyclotrimerization could be promoted and the reaction order of the CE be changed by adding the catalysts. 37,39,42,43 A further study on explaining these differences would be needed.…”

Section: Resultsmentioning

confidence: 95%

Catalytic effects of copper oxides on the curing and degradation reactions of cyanate ester resin

Hong¹,

Yeh²

2007

J of Applied Polymer Sci

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The catalytic effect of copper oxides on the curing and degradation behaviors of the cyanate ester resin is studied with infrared spectroscopy, attenuated total reflection infrared spectroscopy (ATR), differential scanning calorimetry (DSC), and thermogravimetry analysis (TGA). The result of infrared spectroscopy and DSC analyses indicates that accelerated curing effects from different additives are in the order of zinc octoate > cuprous oxide > cupric oxide. The exothermic characteristics of the cyanate ester resin during cure are drastically affected by the presence of the copper oxides. In addition, it is obtained from TGA analyses that the thermal stability and degradation mechanism of cyanate ester resins are also significantly affected by the addition of copper oxides whereas the extent of degradation from the cupric oxide is greater than that from the cuprous oxide. These results are attributed to the differences in catalytic effects and surface areas of two copper oxides on the cyanate ester resin in contact during the thermal exposure.

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Section: Resultsmentioning

confidence: 95%

Catalytic effects of copper oxides on the curing and degradation reactions of cyanate ester resin

Hong¹,

Yeh²

2007

J of Applied Polymer Sci

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“…The rotation and vibration information was very specific to the chemical bonds, and the peaks in the spectrum corresponded to certain chemical bonds allowing simple identifications. The relative intensity of peaks was also directly proportional to the relative concentration of the components in a sample [31][32][33]. Isothermal FTIR analysis of the curing of DEN/HMMM/EMI-24 and MDEN/HMMM Figures 7a, 7b and 7c, respectively.…”

Section: Isothermal Ftir Analysismentioning

confidence: 93%

Curing kinetics, mechanism and chemorheological behavior of methanol etherified amino/novolac epoxy systems

Zhao¹,

Zhang²,

Sun³

et al. 2014

Express Polym. Lett.

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Abstract. The curing kinetics and mechanism of epoxy novolac resin (DEN) and modified epoxy novolac resin (MDEN) with methanol etherified amino resin were studied by means of differential scanning calorimetry (DSC), Fourier transforminfrared (FT-IR) spectroscopy and chemorheological analysis. Their kinetics parameters and models of the curing were examined utilizing isoconversional methods, Flynn-Wall-Ozawa and Friedman methods. For the DEN mixture, its average activation energy (E a ) was 71.05 kJ/mol and the autocatalytic model was established to describe the curing reaction. The MDEN mixture exhibited three dominant curing processes, termed as reaction 1, reaction 2 and reaction 3; and their E a were 70.05, 106.55 and 101.91 kJ/mol, respectively. Besides, E a of reaction 1 was similar to that of DEN mixture, while E a of reactions 2 and 3 corresponded to that of the etherification reaction between hydroxyl and epoxide group. Moreover, these three dominant reactions were n th order in nature. Furthermore, their curing mechanisms were proposed from the results of DSC and FTIR. The chemorheological behavior was also investigated to obtain better plastics products via optimizing the processing schedules.

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“…Thus, the conversion of unsaturated maleimide groups, α, was calculated by the following equation:

α = 1 - true(\frac{{(A_{695 c m^{- 1}} ∕ A_{1724 c m^{- 1}})}_{t}}{{(A_{695 c m^{- 1}} ∕ A_{1724 c m^{- 1}})}_{t = 0}} true)

where A i is the area of the vibration band at time t . 21 …”

Section: Methodsmentioning

confidence: 99%

In situ forming poly(ethylene glycol)‐based hydrogels via thiol‐maleimide Michael‐type addition

Kao

2011

J Biomedical Materials Res

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The incorporation of cells and sensitive compounds can be better facilitated without the presence of UV or other energy sources that are common in the formation of biomedical hydrogels such as poly(ethylene glycol) hydrogels. The formation of hydrogels by the step-growth polymerization of maleimide- and thiol-terminated poly(ethylene glycol) macromers via Michael-type addition is described. The effects of macromer concentration, pH, temperature, and the presence of biomolecule gelatin on gel formation were investigated. Reaction kinetics between maleimide and thiol functional groups were found to be rapid. Molecular weight increase over time was characterized via gel permeation chromatography during step-growth polymerization. Swelling and degradation results showed incorporating gelatin enhanced swelling and accelerated degradation. Increasing gelatin content resulted in the decreased storage modulus (G’). The in vitro release kinetics of FITC-labeled dextran from the resulting matrices demonstrated the potential in the development of novel in situ gel-forming drug delivery systems. Moreover, the resulting networks were minimally adhesive to primary human monocytes, fibroblasts and keratinocytes thus providing an ideal platform for further biofunctionalizations to direct specific biological response.

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FTIR isothermal cure kinetics and morphology of dicyanate ester resin/polysulfone blends

Cited by 37 publications

References 36 publications

Catalytic effects of copper oxides on the curing and degradation reactions of cyanate ester resin

Catalytic effects of copper oxides on the curing and degradation reactions of cyanate ester resin

Curing kinetics, mechanism and chemorheological behavior of methanol etherified amino/novolac epoxy systems

In situ forming poly(ethylene glycol)‐based hydrogels via thiol‐maleimide Michael‐type addition

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