Photoactivated Cationic Frontal Polymerization

Falk, Benjamin; Zonca, Michael R.; Crivello, James V.

doi:10.1002/masy.200550810

Cited by 35 publications

(33 citation statements)

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“…The same effect has been noted by Sasaki [23] for unsensitized photopolymerizations of this monomer carried out using short wavelength UV light. In a recent paper [24] , we have shown that oxetane monomers such as POX which display long induction periods undergo frontal polymerizations. A mechanism was proposed to explain this behavior.…”

Section: Cationic Photopolymerizations Using Curcumin Photosensitizationmentioning

confidence: 97%

Indian Turmeric and its Use in Cationic Photopolymerizations

Crivello

Bulut

2006

Macromolecular Symposia

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Summary: Curcumin, an intensely yellow dye isolated from Indian turmeric is an excellent electron-transfer photosensitizer for cationic vinyl and ring-opening polymerizations. Especially attractive features of curcumin are its strong absorption, broad spectral sensitivity, efficient electron-transfer, low toxicity and low cost. Using curcumin as a photosensitizer, the cationic photopolymerizations of a variety of monomers were carried out including such naturally derived monomers as epoxidized terpenes and epoxidized vegetable oils. The impact of this technology on applications such as housing, boat-building and water distribution is discussed.

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Section: Cationic Photopolymerizations Using Curcumin Photosensitizationmentioning

confidence: 97%

Indian Turmeric and its Use in Cationic Photopolymerizations

Crivello

Bulut

2006

Macromolecular Symposia

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“…As example, the decrease of light penetration with increasing thickness represents a serious drawback for thick, pigmented coatings and fiber-reinforced composites. Therefore, the concept of dual-cure initiating systems based on both photo-thermal curing appears as a promising alternative to solve the issue [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Indeed, the combination of a photochemical polymerization promoting a thermal curing has rendered possible the curing of thick samples.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the thermal process can also be used to complete the curing of the epoxide resin in shadowed areas, typically in the case of 3D parts. In the best cases, the photochemical process would also speed up the thermal curing to perform a photoinduced thermal frontal polymerization [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Dual-cure Photo-thermal Initiating System for Cationic Polymerization of Epoxy under LED Visible Light

Lecompère

Allonas

Maréchal³

et al. 2017

J. Photopol. Sci. Technol.

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The development of new initiating systems for epoxy resin curing remains a highly interesting topic, especially for composites and coatings applications. Among all the possibilities existing to cure an epoxy resin, recent works have highlighted novel photo-thermal cationic initiators based on pyrylium salts. Interestingly, absorption spectra of trisubstituted pyrylium salts extend up to the visible region, a feature that was not exploited yet. In this paper, the pyrylium salts absorption spectra were predicted using Density Functional Theory. It is shown that accurate prediction of UV-Vis spectra can be made at relatively moderate level of theory. Then, visible photopolymerization of epoxy resin was performed under mercury lamp and 395 nm LED. Finally, a photoinduced thermal frontal polymerization of a thick sample of epoxy resin was performed by prompting the reaction at 395 nm. This work opens new opportunity in the polymerization of thick materials such as for composites.

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“…Crivello and coworkers successfully utilized FP in thin reaction zones with certain oxirane and oxetane monomers by using photoactivated initiators [7,8]. While in previous studies of FP, the heat produced by the initial FP reaction was sufficient for the generation of a polymer front and for its subsequent self-propagation through the reactant mixture, experimentalists have witnessed that this is often not the case for thin reaction layers.…”

Section: Introductionmentioning

confidence: 99%

The enhancement of weakly exothermic polymerization fronts

2006

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The propagation of one-dimensional waves resulting from chemical reactions in a sandwich-type two-layer setting is considered. One layer, termed the polymerization layer, contains the monomer and initiator molecules needed for the initiation of a self-propagating polymer front. The other layer will be referred to as the enhancement layer, and it contains the necessary reactants to support a highly exothermic self-propagating reaction wave. Heat exchange occurs between the layers, and as a result, there is a net diffusion of heat away from the region undergoing the more exothermic reaction. As frontal polymerization (FP) reactions are known not to be very exothermic, an overall transfer of heat from the enhancement layer into the polymerization layer takes place. An analysis of the basic state of the system is carried out to investigate the effect of heat transfer on the polymerization reaction. An enhancement layer is shown to promote FP. This analysis is applicable to the manufacture of thin polymer films by FP.

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Photoactivated Cationic Frontal Polymerization

Cited by 35 publications

References 0 publications

Indian Turmeric and its Use in Cationic Photopolymerizations

Indian Turmeric and its Use in Cationic Photopolymerizations

Dual-cure Photo-thermal Initiating System for Cationic Polymerization of Epoxy under LED Visible Light

The enhancement of weakly exothermic polymerization fronts

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