Cationic photopolymerizations of thick polymer systems: Active center lifetime and mobility

Ficek, Beth A.; Thiesen, Amber M.; Scranton, Alec B.

doi:10.1016/j.eurpolymj.2007.10.023

Cited by 40 publications

(42 citation statements)

References 14 publications

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“…The T g 's of photocured matrices based on PPGDGE at different temperatures were found to be -16.1±2 o C while that of PPGDGE with 25 wt% of RDGE were found to be 6.4±2 o C, for all formulations cured from 50 o C. For PPGDGE based matrices, a negative T g resulted in non vitrifying nature of the matrix on cure which when coupled with the 'living' nature of polymerization and probability of dark cure resulted in attaining almost similar final T g of cure at higher temperatures. It is reported that the 'living'nature of photocationic polymerization can result in occurrence of very low rate of polymerization by dark cure, even after stoppage of irradiation[36]. Similar non vitrifying nature was also observed for formulations with 25 wt% of RGDE due to the influence of final T g on cure.…”

supporting

confidence: 60%

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

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supporting

confidence: 60%

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

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“…Compared with free radical photocure systems, cationic photocure systems are not inhibited by oxygen and can lead to very long active center lifetimes. 26 To understand the basic differences between E-SBO and E-polyVESFA in a Fig. 12: Shear modulus as a function of time at 120°C for a blend of E-polyVESFA and TETA as well as E-SBO and TETA.…”

Section: Coatings Produced By Cationic Photocurementioning

confidence: 99%

Coatings derived from novel, soybean oil-based polymers produced using carbocationic polymerization

Alam

Chisholm

2011

J Coat Technol Res

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In this study, a process was developed to obtain vinylether-functional monomers containing fatty acid pendent groups directly from soybean oil (SBO) using base-catalyzed transesterification. In addition, a carbocationic polymerization process was developed for the vinylether monomers, which allowed for high molecular weight polymers to be produced without consuming any of the vinyl groups present in the fatty acid portion of the monomers. Compared to SBO, which possesses on average 4.5 vinyl groups per molecule, the polyvinylethers based on the soybean oilderived vinylether monomers (polyVESFA) possess tens to thousands of vinyl groups per molecule depending on the polymer molecular weight produced. As a result of this difference, coatings based on polyVESFA were shown to possess much higher crosslink density at a given degree of functional group conversion compared with analogs based on conventional SBO. In addition, the dramatically higher number of functional groups per molecule associated with polyVESFA results in gel-points being reached at much lower functional group conversion, which was shown to dramatically reduce cure-time compared with SBO-based analogs. Based on the results obtained, it appears that these new renewable materials may have tremendous commercial utility in the coatings industry.

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“…Cationic photo-polymerization is living polymerization that remains active, till the resin is completely cured, even if irradiation has been stopped. 20 Due to easy access of free radical monomers and photoinitiators, mostly UV-curing has been carried out through free radical polymerization systems. But these systems have some major drawbacks, such as the inhibition effect due to oxygen sensitivity, excessive shrinkage while curing, and irritation to the human body.…”

Section: Cationic Photoinitiatorsmentioning

confidence: 99%

Cationically UV-Cured Epoxy Composites

2015

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This review article is a comprehensive study of different approaches utilized by various researchers for UV-cure epoxy composites through the cationic route in the form of transparent or colored composites either in thin films or thick dimensions. Generally UV curing is applied on thin and transparent materials, yet attempts are being made to cure intensely colored and thick composite samples. In recent times, thick sample UV-curing has been actively explored to decrease the processing and fabrication expenses of complex assemblies. In this article, data has been reviewed about epoxy curing with methodological trends, not only in thin films but also in thick samples.

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Cationic photopolymerizations of thick polymer systems: Active center lifetime and mobility

Cited by 40 publications

References 14 publications

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

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

Coatings derived from novel, soybean oil-based polymers produced using carbocationic polymerization

Cationically UV-Cured Epoxy Composites

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