Photoinitiated polymerization of a dimethacrylate oligomer: 2. Kinetic studies

Lecamp, Laurence; Youssef, B.; Bunel, Claude; Lebaudy, P.

doi:10.1016/s0032-3861(98)00380-2

Cited by 88 publications

(62 citation statements)

References 38 publications

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“…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: 72%

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

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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.

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Section: Resultssupporting

confidence: 72%

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

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“…The data of maximal polymerization rate (R pmax ), maximal heat flow (H max ), time to reach maximal heat flow (T max ) and final conversion of HDDA are summarized in Table 2. The polymerization behavior appears similar to other multifunctional monomers with different photoefficiency [5,36,37].…”

Section: Photopolymerization Of Hddasupporting

confidence: 65%

ESR and photopolymerization study of polymerizable benzophenone photoinitiators containing functional maleimide groups

Wei

Liu

2008

E-Polymers

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Four kinds of novel polymerizable benzophenone (BP) photoinitiators MBP, BMBP, MPBP, BMPBP containing functional maleimide groups, were used as free radical photoinitiators with N-methyldiethanolamine (MDEA) as coinitiator (H donor). Such photoredox systems were studied by means of ESR spectra. The results show that all the four photoinitiators possess the same initiation mechanism as BP/MDEA system; meanwhile, two kinds of radicals were observed as the excited triplet of the photoinitiators can abstract hydrogen from the methylene groups or the methyl groups of MDEA. The photopolymerization of three monomers with different functionality, methyl methacrylate (MMA), 1,6-hexanediol diacrylate (HDDA) and trimethylolpropane triacrylate (TMPTA), initiated by these four polymerizable photoinitiators, was studied through dilatometer and photo-DSC. The results show that different photoinitiators behave differently towards monomers: MPBP system is the most efficient for all the three monomers; BMPBP is the least efficient for MMA, and BMBP is the least efficient for HDDA and TMPTA. The efficiency of the photopolymerization is greatly affected by maleimide groups and different vinyl monomers.

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“…The kinetics of the photoinitiated polymerization of acrylates and methacrylates has been studied by means of photo differential scanning calorimetry (photoDSC) [17][18][19][20][21][22][23], real time Fourier transform infrared analysis (FT-IR) [18,[24][25][26], photorheology [27,28], and fluorescent probe [29,30]. The autocatalytic model has been widely employed to describe the photopolymerization kinetics [17,20,30,31].…”

Section: Introductionmentioning

confidence: 99%

“…The autocatalytic model has been widely employed to describe the photopolymerization kinetics [17,20,30,31].…”

Section: Introductionmentioning

confidence: 99%

Time-intensity superposition for photoinitiated polymerization of fluorinated and hyperbranched acrylate nanocomposites

Vacche

Geiser

Leterrier

2010

Polymer

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a b s t r a c tThe validity of the time-intensity superposition principle for the photoinitiated polymerization of nanocomposites based on a monofunctional fluorinated acrylate and on a multifunctional hyperbranched polyether acrylate was investigated in this work. Master curves were obtained for the conversion as a function of time, measured by photo differential scanning calorimetry, by shifting on the time axis the curves obtained at different intensities. A power-law dependence of the shift factor on the intensity was found for all materials, with exponents equal to 0.45 AE 0.03 for the fluorinated acrylates and to 0.71 AE 0.05 for the hyperbranched polyether acrylates. Consequently it is inferred that the radiant exposure reciprocity law, implying linear dependence of the shift factor on intensity, does not apply to the studied compositions. The kinetics of the photopolymerization of materials based on the fluorinated acrylate was analyzed with the autocatalytic model. The final conversion was independent on intensity and filler content. The rate constants showed for all materials a power-law dependency on intensity, with exponents similar to those of the corresponding shift factors.

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Photoinitiated polymerization of a dimethacrylate oligomer: 2. Kinetic studies

Cited by 88 publications

References 38 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

ESR and photopolymerization study of polymerizable benzophenone photoinitiators containing functional maleimide groups

Time-intensity superposition for photoinitiated polymerization of fluorinated and hyperbranched acrylate nanocomposites

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