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A series of epoxy-telechelic polyalkenamers with varying molar masses were synthesized by ring-opening metathesis polymerization of 3-ethylcyclooctene using a diepoxy-functionalized symmetric chain transfer agent with p-benzoquinone as an additive. An epoxy-telechelic polyolefin was also synthesized using 3-ethylcyclooctene and a carboxybenzyl-protected diol chain transfer agent by ring-opening metathesis polymerization followed by post-polymerization modification. The prepolymers were crosslinked with UV light in the presence of photoacid generators, and network formation was monitored by photorheology. The stiffness and ultimate elongation of the resulting elastomers was tuned by varying molar mass and backbone unsaturation of the prepolymer.
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We thank The Dow Chemical Company for financial support of this research. We thank Dr. Jeff Munro, Dr. Colin Li Pi Shan, Dr. Thomas Peterson, and Dr. Christopher Thurber for their guidance and advice. All rheology was carried out in the College of Science and Engineering Polymer Characterization Facility, University of Minnesota, which has received capital equipment funding from the NSF through the UMN MRSEC program under Award Number DMR-1420013. We thank Dr. David Giles for his guidance and helpful discussions regarding photorheology and oscillatory shear rheology.
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