UV Curing of Organic‐Inorganic Hybrid Coatings Containing Polyhedral Oligomeric Silsesquioxane Blocks

Abstract

Hybrid nanocomposite coatings were prepared by the UV‐curing technique with a methacrylic oligomer and multifunctional methacrylic polyhedral oligomeric silsesquioxane blocks (POSS®). The results obtained from the polyhedral compounds were compared with those of a disordered framework obtained by the condensation of a silica precursor (MEMO). The inorganic domains generated during synthesis created constraints in movement of polymer segments, which reflected in an increase in Tg of the hybrid nanocomposite coatings. The films were transparent. The random structure obtained by the condensation of the MEMO showed a stronger effect on Tg than that observed by introducing POSS®. The effect of inorganic domains reflected on thermal stability, surface hardness and mechanical properties of the hybrid nano‐composite coatings.magnified image

Infrared Spectroscopy as a Tool to Monitor Radiation Curing

“…As an example the RT-FTIR spectra for a methacrylic resin at different irradiation time are shown in Figure 2 [ Amerio et al 2008]. It is evident that the band at 1630 cm -1 (C=C), attributed to the methacrylic functional group, decreases during irradiation of the sample with the UV beam.…”

Nanotribological Characterization of Polymeric Nanocoatings: From Fundamental to Application

“…In numerous papers they have been utilized to reinforce the matrix structure of a wide range of thermosets and/or thermoplastics. These hybrid materials have been used for improving the surface properties of a typical methacrylic coating (Amerio et al 2008). The final properties of UV cured films demonstrated that introducing 5 and 10 % of POSS content in the organic resin enhanced the scratch resistance around 5 and 8 times, respectively.…”

Syntheses of novel photosensitive polysiloxanes and their effects on properties of UV-cured epoxy methacrylate coatings

“…This is in agreement with other research reports that using quantitative crosslink agent to epoxy resin UV-curing systems can increase thermal stability. 25,26 In the case of DSC analysis, the DSC curves of the samples are displayed in Fig. 4, and the T g values are indicated by the arrows in this figure and listed in Table 2.…”