Preparation of cycloaliphatic epoxy hybrids with non-conventional amine-curing agents

Abstract

Cycloaliphatic epoxy resin has been successfully thermally cured using a polyamino siloxane oligomer as hardener. The curing reaction was followed by infrared spectroscopy in the near range, and thermal transitions were measured by dynamic mechanical thermal analysis. The use of accelerants and a plasticizer (dodecylphenol), and different curing schedules were explored. Cured materials showed high Tg values (around 125 164°C), and the analysis of laser scanning confocal microscopy images showed that they are homogeneous in the microscale.

Synthesis of a liquid zirconium hybrid resin and the ability of the resin to accelerate the curing of a transparent silicone-modified cycloaliphatic epoxy nanocomposite

“…(a), the SEP–MHHPA solution had a very high reaction temperature, with a peak temperature above 200 °C. This means that the siloxane‐modified cycloaliphatic epoxy reacted poorly with the anhydride, because the cyclohexyl group in a cycloaliphatic epoxy is not an electron‐withdrawing group and because of the low electronegativity of siloxane, which bonds to the cyclohexyl epoxy and decreases the reactivity of the epoxy . It can be seen from Fig.…”

Sunlight curable hybrid organic–inorganic methacrylic‐based coatings: analysis of the cure mechanism and functional properties

“…The same polymeric product could, in fact, reach very high T g (around 125-164°C) only when it is cured at high temperature. [42] In order to verify if the thermal treatment used to complete the sol-gel reactions of the UV photo-curable hybrid system, i. e., Hybrid 819 , developed in a previous study, [33][34][35][36][37] could be substituted by the natural sunlight exposure at ambient temperature, the hybrid coating was applied on glass substrate, photo-cured for 6 hr under UV lamp and, then, exposed for 55 hr to natural sunlight. This novel double photo-curing mechanism was called "natural dual curing".…”

Infrared Spectroscopy - Materials Science, Engineering and Technology

“…The main features observed in the spectrum are only the overtones of C-H and CH 2 stretching bands. Although near infrared spectroscopy does not provide much useful information for this resin, it can still be used for monitoring the curing process through the evolution of the bands assigned to the curing agent (M. Gonzalez et al, 2011).…”

“…Determining conversion in these systems by IR is not an easy task, since the combination bands of the epoxy group in the near range overlap with other bands. Nevertheless, it is possible a semiquantitative approach considering the primary amine combination band at ≈ 4900 cm -1 and at longer reaction times (when primary amine is exhausted) progress of the reaction can be qualitatively followed from the primary and secondary amine combination band at 6530 cm -1 (Kradjel & Lee, 2008;M. Gonzalez et al, 2011).…”