Ultraviolet curing kinetics of cycloaliphatic epoxide with real‐time fourier transform infrared spectroscopy

Chen, Jianxia; Soucek, Mark D.

doi:10.1002/app.12898

Cited by 34 publications

(30 citation statements)

References 29 publications

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“…The more condensed the silicate network, the lower the mobility of the cationic reactive species. [45] Nevertheless, the steric effect is unlikely to prevail since TRIMO samples remain poorly condensed irrespective of the aging time. Another explanation may be related to the variation in the hydroxyl group concentration in the various siloxane resins.…”

Section: Epoxy Cationic Photopolymerizationmentioning

confidence: 99%

Synthesis of Organosilica Films Through Consecutive Sol/Gel Process and Cationic Photopolymerization

Versace

Chemtob

Croutxé‐Barghorn

et al. 2010

Macro Materials & Eng

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The cationic photopolymerization of epoxy polysilsesquioxane resins synthesized through a acid‐catalyzed sol/gel process is studied. To elucidate the effect of the organic substituent on sol/gel reaction kinetics, two organotrimethoxysilanes with different organic groups were employed. Effects of UV irradiation on the microstructure of the epoxy‐functional polysilsesquioxanes were also studied. 29Si solid‐state MAS NMR proved that UV‐generated Brönsted acids favored a work‐up of the silicate network by promoting new sol/gel condensation reactions. There was a significant slowdown of epoxy conversion rates with increasing sol aging, which may be due to a competition between an active chain end and an activated monomer mechanism for the epoxy cationic polymerization.magnified image

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Section: Epoxy Cationic Photopolymerizationmentioning

confidence: 99%

Synthesis of Organosilica Films Through Consecutive Sol/Gel Process and Cationic Photopolymerization

Versace

Chemtob

Croutxé‐Barghorn

et al. 2010

Macro Materials & Eng

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“…The presence of noncross-linked areas might favour a mobilization of the propagating cationic species that would normally be sequestrated within the highly cross-linked photopolymer network. [36,37] Consequently, an enhanced contribution of AM mechanism might be mainly responsible for an acceleration of the epoxy photopolymerization kinetics in the presence of silica.…”

Section: Cationic Photopolymerization Kinetics In Presence Of Epoxy-fmentioning

confidence: 99%

Cationic Photopolymerization in Presence of Functionalized Silica Nanoparticles

Chemtob

Croutxé‐Barghorn

Soppera

et al. 2009

Macro Chemistry & Physics

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The present study focuses on the synthesis of various silica‐filled polymer nanocomposites via cationic photopolymerization. The first part describes the chemical modification of fumed silica nanoparticles and their subsequent incorporation in three types of epoxy resins. 29Si CP MAS NMR spectroscopy and thermogravimetric analysis (TGA) enabled to characterize the surface structural composition of silica while dynamic light scattering (DLS) was employed to assess their degree of dispersion. In addition, the photopolymerization kinetics were investigated using real‐time Fourier transform infrared spectroscopy (RT‐FTIR). The capacity of reinforcement of the resulting nanocomposite films were explored in regard to modulus, glass transition behaviour, abrasion resistance and hardness.magnified image

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“…[29] The effects of temperature, UV light intensity, sol-gel precursor concentration, and exposure time were studied on cycloaliphatic epoxides. Kinetics of curing was studied for both UV [30,31] and thermally cured systems. [32] Amino functionalized siloxanes have been extensively studied as a component of a large number of segmented materials.…”

Section: Full Papermentioning

confidence: 99%

Synthesis of Amine and Epoxide Telechelic Siloxanes

Chakraborty

Soucek

2008

Macro Chemistry & Physics

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A synthetic route was developed to prepare thermosetting methyl, cyclopentyl, and cyclohexyl substituted polysiloxanes with epoxide or amino end groups. Cycloalkene (cyclopentene or cyclohexene) and dichlorosilane gas were reacted at 180 °C, and at high pressure (2 MPa) to produce dicycloaliphatic dichlorosilane. Hydrolytic condensations of the dichlorosilanes were performed affording low molecular weight cyclic siloxane oligomers. Base catalyzed ring opening polymerization of the cyclic oligomers afforded the hydride‐terminated polysiloxanes. The hydride‐terminated polysiloxanes were then functionalized with glycidyl epoxide or aliphatic amine groups via hydrosilation reactions. The oligomers and polymers were characterized by 1H NMR, 13C NMR, 29Si NMR, FTIR, and GPC. The molecular weight of polydimethylsiloxane, polydicyclopentylsiloxane, and polydicyclohexylsiloxane oligomers were $\overline M _{\rm n}$ = 1 000, 1 200, and 1 500, respectively. The polydispersity index of all the cyclic oligomers was ≈1.15. Differential scanning calorimetry (DSC) was used to evaluate the crosslinking reaction and the glass transition temperature of the thermally cured systems. Crosslinking occurred at 120 °C and the Tg of the methyl, cyclopentyl, and cyclohexyl functionalized siloxanes were found to be at −104, −93, and −82 °C, respectively.magnified image

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Ultraviolet curing kinetics of cycloaliphatic epoxide with real‐time fourier transform infrared spectroscopy

Cited by 34 publications

References 29 publications

Synthesis of Organosilica Films Through Consecutive Sol/Gel Process and Cationic Photopolymerization

Synthesis of Organosilica Films Through Consecutive Sol/Gel Process and Cationic Photopolymerization

Cationic Photopolymerization in Presence of Functionalized Silica Nanoparticles

Synthesis of Amine and Epoxide Telechelic Siloxanes

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