Kinetics study of the UV-initiated cationic polymerization of cycloaliphatic diepoxide resins

Voytekunas, Vanda Yu.; Ng, Fern Lan; Abadie, M. J. M.

doi:10.1016/j.eurpolymj.2008.08.043

Cited by 56 publications

(43 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 2 shows the maximum degrees of conversion of the photocuring by DSC of the epoxy resin at different temperatures with different proportions of the trithiol and the vinyl compound. This degree of conversion increases with temperature, as commonly observed for other photocuring systems [6,[20][21][22][23] due to vitrification occurring at higher degrees of conversion when the photocuring temperature increases [24]. However, it is shown that the effect is very small when the proportion of thiol-ene modifiers is 5 % or greater, showing that, even if the temperature increases, the stability of the alkylsulfonium salts formed in the photocuring stage is sufficiently high to prevent epoxy homopolymerization from taking place at these temperatures, as reported previously [17].…”

Section: Resultssupporting

confidence: 71%

Photocuring and thermal post-curing of a cycloaliphatic epoxide resin with a trithiol and a vinyl epoxy compound

Morancho

Fernández‐Francos

Ramis

et al. 2015

J Therm Anal Calorim

View full text Add to dashboard Cite

In this work, the influence of trimethylolpropane tris-(3-mercaptopropionate) and a vinyl epoxy compound (4-vinyl-1-cyclohexene 1,2-epoxide) over the photocuring and subsequent thermal curing of an epoxy resin (CYRACURE UVR-6105) is studied. The photoinitiator used is CYRACURE UVI-6976. The techniques used in this study have been DSC (differential scanning calorimetry) and FTIR (Fourier transform infrared spectroscopy). In the isothermal photocuring, when the proportion of the modifiers are 5 % or greater, the photopolymerization of the epoxy resin is stopped by the thiol-ene reaction of both modifiers, due to the formation of alkyl sulfonium salts, decreasing the maximum degree of conversion of the process. After the photocuring process, the different systems studied have been post-cured thermally and the activation energy of this process has been determined using a differential isoconversional method. When the epoxy resin is neat or only it has been added 2.5 % of the modifiers, at the beginning of the post-curing the activation energy decreases, but when the proportion of the modifiers is 5 % or greater, the activation energy always increases.

show abstract

Section: Resultssupporting

confidence: 71%

Photocuring and thermal post-curing of a cycloaliphatic epoxide resin with a trithiol and a vinyl epoxy compound

Morancho

Fernández‐Francos

Ramis

et al. 2015

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…If dH/dt represents the heat flow per unit time, then the rate of photopolymerization (R p ) is given by [18,19,21]  …”

Section: Resultsmentioning

confidence: 99%

“…The model has also been found to be applicable for photosensitized cationic polymerization of cycloaliphatic diepoxides [18,19]. Inhibition in photocationic polymerization can be achieved by any species which neutralizes the propagating cationic center.…”

Section: Introductionmentioning

confidence: 99%

Inhibition effect of N,N-diglycidyl-4-glycidyloxy aniline on photosensitized cationic polymerization of formulations involving resorcinol diglycidyl ether and poly(propylene glycol)diglycidyl ether

Harikrishna

2015

Journal of Photochemistry and Photobiology A: Chemistry

View full text Add to dashboard Cite

“…DPC has been used to study the kinetics of cationic and radical photopolymerization of various monomers for decades, including divinyl ether [16], glycidyl acrylate [17] and cycloaliphatic diepoxy [18,19]. It is a powerful tool for the comparisons of activation energy, rate of polymerization and degree of conversion among the systems to achieve optimum formulation for applications.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, characterization and photopolymerization of vinyl ether and acrylate functionalized hybrid oligo-caprolactone

et al. 2011

View full text Add to dashboard Cite

Linear vinyl ether-(oligo-caprolactone)-acrylate (VPCLA), combining fast free radical and complete cationic photopolymerizable groups, was synthesized, functionalized, and photopolymerized to produce polycaprolactone (PCL) network. Fourier Transform Infrared (FTIR) spectra confirmed that the C 0 C peaks from both vinyl ether and acrylate end groups were consumed after photopolymerization. Kinetics parameters obtained from differential scanning photocalorimetry (DPC) analysis showed that photopolymerization of VPCLA at early stage was accelerated as the time needed to reach peak maximum was shortened, and the induction time was significantly shortened compared to monofunctional vinyl ether-(oligo-caprolactone) (VPCL). The activation energy (E a ) was calculated to be 14 kJ/mol, assuming second-order autocatalytic model was followed. Rate of polymerization of the hybrid oligomers was doubled in dual photoinitiators system, which contained both cationic and radical photoinitiators. Furthermore, the conversion was greatly improved at the presence of divinyl ether/hydroxybutyl vinyl ether in 1:1 ratio.

show abstract

Kinetics study of the UV-initiated cationic polymerization of cycloaliphatic diepoxide resins

Cited by 56 publications

References 14 publications

Photocuring and thermal post-curing of a cycloaliphatic epoxide resin with a trithiol and a vinyl epoxy compound

Photocuring and thermal post-curing of a cycloaliphatic epoxide resin with a trithiol and a vinyl epoxy compound

Inhibition effect of N,N-diglycidyl-4-glycidyloxy aniline on photosensitized cationic polymerization of formulations involving resorcinol diglycidyl ether and poly(propylene glycol)diglycidyl ether

Synthesis, characterization and photopolymerization of vinyl ether and acrylate functionalized hybrid oligo-caprolactone

Contact Info

Product

Resources

About