Structure-property-relationship of sustainable thermosets using photoinitiated cationic ring-opening polymerization of epoxy and oxetane

Authors
Yang, Zheqin
ORCID
Loading...
Thumbnail Image
Other Contributors
Ryu, Chang Yeol
Gross, Richard A.
Bae, Chulsung
Lee, Sangwoo.
Issue Date
2017-05
Keywords
Chemistry
Degree
PhD
Terms of Use
This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Full Citation
Abstract
Because of the high viscosity of ELO (?? = 2,100 cp) at room temperature, the UV curing kinetics of ELO is limited by the slow diffusion of monomers. Extensive characterization techniques, such as optical pyrometry, DSC, real-time ATR-FTIR, Confocal Raman spectroscopy and DMA, were employed to study and control the mechanical and thermal properties of the UV-cured ELO films using thermal postcuring and the copolymerization of reactive low-viscosity comonomers. While the DOX monomer has a low viscosity (?? = 13 cp) and the ring strain energy of oxetane is comparable to that of epoxide, DOX shows a long induction time (typically ~ 60 sec) before the onset of autoaccelerated cationic polymerization. We found that the prolonged induction period is due to the resonance-stabilized secondary oxonium ion intermediate formed during photoinitiation.
Description
May 2017
School of Science
Department
Dept. of Chemistry and Chemical Biology
Publisher
Rensselaer Polytechnic Institute, Troy, NY
Relationships
Rensselaer Theses and Dissertations Online Collection
Access
Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.