Abstract
Laser vibrational overtone initiated polymerization of ethylene glycol dimethacrylate (EGDMA) has been demonstrated using two initiators, benzoyl peroxide (BP) and 2,2‘-(azobis)isobutyronitrile (AIBN). Excitation of the initiator occurs through absorption of a single photon by the fifth CH stretching vibrational overtone transition at 604 nm (16 556 cm-1) for BP and 628 nm (15 924 cm-1) for AIBN. This vibrational excitation creates radicals that initiate radical chain polymerization. Monomer conversion was followed quantitatively by monitoring the intensity change of the vinyl combination band at 6169 cm-1 in the first overtone spectrum of EGDMA. Considering the concentration, the molar extinction coefficient, and laser power, AIBN was a factor of 3.2 more efficient than BP for vibrational overtone polymerization. In both cases, the rate of polymerization depends on the excitation wavelength. The influence of the initiator concentration and the photolysis duration is also presented.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
