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1.
The curing of diallylterephthalate determination of the kinetic triplet A, Ea,app, ƒ(α) using the isoconversional method
Dušan Klinar, Janvit Golob, Matjaž Krajnc, 2003, original scientific article

Abstract: Allyl polymers are important materials for the production of high performance ophthalmic lenses by free-radical bulk polymerization in the casting process. Isoconversional model-free analysis was applied to the isothermal and nonisothermal curing of diallylterephthalate performed by DSC at different sets of heating rates. The results of the kinetic analysis in a form of kinetic triplet $(Ea, A, ƒ(α))$ present the variation of the Arrhenius parameters with the calculation method, reaction extent, process mode and heating rates applied. This variation is a sign of the complex and multi-step reaction mechanism. Such a mechanism was approximated with one step $(1-α)^n$ reaction model. With the isokinetic relationship - IKR (compensation effect) in the form of $lnA=aEa,app+b$ it was found out that the isothermal and nonisothermal IKR lines converge to different singular points. From the correlation procedure with the experimental data isothermal narrowest point – NPI was selected as a common point. The curing process in the isothermal and nonisothermal process conditions, respectively, was successfully simulated with the obtained kinetic parameters. The possible alternative reaction paths and the partial diffusion control of the curing process are the reasons for the limiting usage of the model-free kinetic analysis method. This method was mainly used as a preliminary step for further analysis with other methods.
Keywords: DSC, DAT, curing kinetics, compensation effect
Published in DKUM: 29.08.2017; Views: 976; Downloads: 89
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2.
Properties of UV-cured pigment prints on textile fabric
Branko Neral, Sonja Šostar-Turk, Bojana Vončina, 2006, original scientific article

Abstract: This paper studies and evaluates the UV-curing of pigment prints on textile fabric using a prototype UV scanner. A printing paste comprising synthetic thickener, emulgator, binder, pigment dispersion and photoinitiator was applied using a flat screen printing technique onto the cotton fabric, then dried and exposed to heat or UV-radiation under a mercury vapour lamp (200 W cm-2). The characteristics of cured prints such as paste add-on, colour properties, colour fastness to washing and dryžwet rubbing were evaluated, together with fabric stiffness. The effects of UV-curing were evaluated by Attenuated Total Reflectance Fourier transform infrared spectroscopy (ATR-FTIR). The properties of the UV-cured pigment prints were compared with those of the thermal cured prints. Analyses of the obtained results helped to define the optimum composition of the photo reactive pigment paste, and the UV-curing conditions under which satisfactory results were obtained, comparable with those from the thermal curing method.
Keywords: textiles, textile printing, printing quality, pigment dispersion, UV-curing, binder, photoinitiator
Published in DKUM: 30.05.2012; Views: 1895; Downloads: 98
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