Photopolymerization of methyl methacrylate using mercaptobenzthiazole as photoinitiator—a kinetic study
TL;DR: In this paper, the authors showed that the participation of mercaptobenzthiazole in the thiol-thione tautomeric form of methyl methacrylate can explain the deviation from the simple reaction scheme, particularly at higher initiator concentrations and with solvents like benzene.
About: This article is published in European Polymer Journal.The article was published on 1989-01-01. It has received 3 citations till now. The article focuses on the topics: Methyl methacrylate & Photopolymer.
Citations
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TL;DR: Indoline-2-thione (BC) and benzimidazole-2 thione (BN) are two aromatic compounds containing a NCS synthonic unit in a heterocyclic ring of five centres, where the main electronic absorption bands are localized in the spectral range of the ultraviolet A and B.
Abstract: Indoline-2-thione (BC) and benzimidazole-2-thione (BN) are two aromatic compounds containing a NCS synthonic unit in a heterocyclic ring of five centres, where the main electronic absorption bands are localized in the spectral range of the ultraviolet A and B. After ultraviolet irradiation by artificial sources or sunlight, these molecular systems in aqueous solution, under controlled pH, present a simple pattern of photochemical reactions defined by a typical isosbestic point in the electronic absorption spectra. The photolysis process observed follows a good linear behavior as function of the irradiation time, being a particular actinometer of short time exposition. On the other hand, the final photochemical products of indoline-2-thione and benzimidazole-2-thione, after irradiation, were identified as indole and benzimidazole, respectively. Other properties such as molecular stability in acid solution at pH Due to the use of water as solvent, without a health hazard by direct manipulation, from an environmental point of view we propose these two thione compounds as new potential photochemical actinometers of solar ultraviolet-B radiation.
12 citations
TL;DR: In this article, a nucleophilic substitution reaction on polyvinyl chloride (PVC) with sodium 2-mercaptobenzothiazolate has been carried out in solution in cyclohexanone at different temperatures.
9 citations
TL;DR: In this article, N-vinyl pyrrolidone (NVP) was polymerized in dioxan at 60'±'0.1°C for 1h using diphenyl ditelluride as radical initiator.
Abstract: N-vinyl pyrrolidone (NVP) was polymerized in dioxan at 60 ± 0.1°C for 1 h using diphenyl ditelluride as radical initiator. The system follows ideal kinetics i.e. R
p
α [DPDT]0.5[NVP]. The activation energy and dissociation constant is computed as 46 kJ mol−1 and 1.1 × 10−11 s−1, respectively. The polymer was characterized with the help of FTIR, 1H-NMR, 13C-NMR, ESR spectroscopy. The FT-IR spectrum showed bands at 1660–1680 cm−1 due to combination of >C = O and C–N stretching. The gyromagnetic constant ‘g’ has been computed as 2.2203. The main product of this reaction were poly(N-vinylpyrrolidone)s with phenyl tellanyl ends. The presence of tellurium in polymer is confirmed by ICP analysis. The DSC shows the T
g
of poly(N-vinylpyrrolidone) is 168°C due to rigid pyrrolidane group. The TGA showed that polymer was stable up to 380°C.The GPC studies showed that the weight average molecular weight decreases with increase of [DPDT].
6 citations
References
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TL;DR: In this paper, the authors derived an equation which allows determination of the classical efficiency of initiation as a function of [I]/[M]2 and also allowed a correction of Rp in handling the above equation by taking into account the small amount of monomer consumed in initiation.
89 citations