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Micromechanical deformation of polyethylene terephthalate (PET)/ethylene-stat-methyl acrylate copolymer [p(E-s-MA)] blends was investigated for various MA contents and molar masses of p(E-s-MA). The copolymers were synthesized by ring-opening metathesis polymerization and subsequent hydrogenation. Varying the MA content and molar mass of the copolymer alters the interfacial adhesion between the PET and the copolymer and the mechanical properties of the copolymer significantly. Transmission electron microscopy images of the blends obtained after tensile deformation reveal that the composition and the molar mass of the copolymer determine whether debonding, cavitation, both, or neither occurs during stretching. The extent of void formation associated with tensile testing was characterized by density measurements.
Bibliographical noteFunding Information:
The authors acknowledge Kimberly-Clark for financial support. Partial support of this work was provided by the Center for Sustainable Polymers, a National Science Foundation-supported Center for Chemical Innovation (CHE-1413862), at the University of Minnesota. Parts of this work were carried out in the Characterization Facility, University of Minnesota, which receives partial support from the National Science Foundation through the MRSEC program. The authors thank Chris Frethem and Han Seung Lee for helping with the SEM imaging. The authors also thank Dr. Alex Todd for helpful discussion.
© 2019 American Chemical Society.
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