Universality in gelation of epoxy acrylate with various photoinitiators: a photo differential scanning calorimetric study

Doğruyol, Zekeriya; Karasu, Feyza; Balta, Demet Karaca; Arsu, Nergis; Pekcan, Önder

doi:10.1080/01411590802136078

Cited by 10 publications

(6 citation statements)

References 33 publications

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“…For photopolymerization experiments an additional method, Photo‐DSC was also used for the polymerization of Laurylacrylate (mono) and TMPTA (triacrylate). Various photoinitiators were used: TX–FN, TX, FN, and CQ, respectively.…”

Section: Resultsmentioning

confidence: 99%

Thioxanthonation of fluorenone: Visible photoinitiator for radical polymerization

Karaca

Balta

Öcal

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

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Thioxanthonation of fluorenone resulted in a new visible light initiator namely, indeno [1,2-b]thioxanthene-7,13-dione (TX-FN). The detailed photophysical properties of the singlet and the triplet excited states of TX-FN are reported using steady-state absorption, fluorescence, and phosphorescence, as well as laser flash photolysis techniques. Photoinitiated polymerization of MMA with TX-FN and CQ has been investigated in the presence and absence of a co-initiator (MDEA). Additionally, Photo-DSC studies were performed both in mono-and multiacrylate systems with TX-FN and parent compounds TX and FN. The obtained results were compared for formulations consisting of CQ. At low initiator concentrations, the conversions were lower than those obtained with TX-FN.

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Section: Resultsmentioning

confidence: 99%

Thioxanthonation of fluorenone: Visible photoinitiator for radical polymerization

Karaca

Balta

Öcal

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

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“…[18] As a continuing study of the photopolymerization kinetics of multifunctional acrylates, we report here photopolymerization of EA/TPGDA with TX-SH as an initiator by Photo-DSC technique at various UV light intensities. It was observed that all conversion curves during gelation had sigmoidal behavior as predicted by the percolation model from which the critical exponents, β, were calculated.…”

Section: Introductionmentioning

confidence: 99%

Critical Exponents of Photoinitiated Gelation at Different Light Intensities

Doğruyol

Arsu

Pekcan

2009

Journal of Macromolecular Science, Part B

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A photo-differential scanning calorimetric (Photo-DSC) technique was used to study the photoinitiated radical polymerization of a 75% epoxy diacrylate (EA) and 25% tripropyleneglycoldiacrylate (TPGDA) mixture with 2-mercaptothioxanthone (TX-SH) as photoinitiator by using different light intensities. Photopolymerization reactions were carried out under identical conditions of temperature and initiator concentration. It was observed that all conversion curves during gelation at various UV light intensities present good sigmoidal behavior as predicted by the percolation model. Observations around the critical time, called the glass transition point (t g ), taken for polymerization to reach the maximum rate (Rp max ) show that the gel fraction exponents β obeyed the universal percolation picture. On the other hand, Rp max , t g , and final conversion values were found to be dependent on the UV light intensity.

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“…Thiol and carboxylic acid derivates of TXs have recently been reported to initiate photopolymerization without coinitiators as they contain functional groups with an H‐donating nature,9–11 their initiating efficiency was tested for polymerization of multifunctional acrylates by photo‐DSC 18–20. Alternately, the attachment of both chromophoric and hydrogen donating groups into polymer chains were performed 21–33.…”

Section: Introductionmentioning

confidence: 99%

“…Thiol and carboxylic acid derivates of TXs have recently been reported to initiate photopolymerization without coinitiators as they contain functional groups with an H-donating nature, [9][10][11] their initiating efficiency was tested for polymerization of multifunctional acrylates by photo-DSC. [18][19][20] Alternately, the attachment of both chromophoric and hydrogen donating groups into polymer chains were performed. [21][22][23][24][25][26][27][28][29][30][31][32][33] It has been also developed a novel TX-based photoinitiator possessing an anthracene group (TX-A), which does not require an additional hydrogen donor for radical formation and initiates the polymerization of both acrylate and styrene monomers only in the presence of air.…”

mentioning

confidence: 99%

A thioxanthone‐based visible photoinitiator

Dogruyol

Doğruyol

Arsu

2011

J. Polym. Sci. A Polym. Chem.

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Thioxanthone‐based 9‐(2‐Morpholine‐4yl‐acetyl)‐5‐thia‐napthasen‐12‐one (TX‐MPM) was synthesized and characterized as a one‐component novel visible photoinitiator. Its capability to act as an initiator for the polymerization of methyl methacrylate (MMA) was examined in photoreactor and also daylight. Photophysical properties: fluorescence and phosphorescence emission spectra and fluorescence quantum yield of TX‐MPM (ϕf = 0.29) were determined. The phosphorescence lifetime was found 131 ms for TX‐MPM and 110 ms for initiator‐attached polymer (PMMA) at 77 K, indicated a π→π* nature of the lowest triplet state. A model compound, morpholino acetonapthone was used as quencher for the triplet states of TX‐MPM and the quenching rate constant was determined (kq = 1.26 × 109 M−1s−1). According to laser flash photolysis studies, intermolecular hydrogen abstraction process was more dominant path to the formation of the initiating radicals. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011

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Universality in gelation of epoxy acrylate with various photoinitiators: a photo differential scanning calorimetric study

Cited by 10 publications

References 33 publications

Thioxanthonation of fluorenone: Visible photoinitiator for radical polymerization

Thioxanthonation of fluorenone: Visible photoinitiator for radical polymerization

Critical Exponents of Photoinitiated Gelation at Different Light Intensities

A thioxanthone‐based visible photoinitiator

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