Effects of bond exchange reactions and relaxation of polymer chains on the thermomechanical behaviors of covalent adaptable networks

Material Information

Effects of bond exchange reactions and relaxation of polymer chains on the thermomechanical behaviors of covalent adaptable networks
Luo, Chaoqian ( author )
Place of Publication:
Denver, CO
University of Colorado Denver
Publication Date:
Physical Description:
1 electronic file (39 pages) : ;


Subjects / Keywords:
Polymerization ( lcsh )
Polymerization ( fast )
Academic theses. ( fast )
Academic theses. ( lcgft )
bibliography ( marcgt )
theses ( marcgt )
non-fiction ( marcgt )
Academic theses ( fast )
Academic theses ( lcgft )


Bond exchange reaction (BER) induced stress relaxation in the covalent adaptable network (CAN) polymers can be leveraged to realize the reshaping, thermoforming, and functional shape changing of cross-linked polymers. However, there is no existing study to reveal how the BERs and relaxation of polymer chains would affect the thermomechanical behaviors of CANs individually or in a group, as both two mechanisms could enable the relaxation of internal stress in polymeric networks. In this paper, we studied the thermomechanical behaviors of a polyimine- based CAN with BER activation temperature close to the network glass transition temperature. A multi-branched thermo-viscoelastic constitutive model was established to assist in the discussions. We first established a detailed identification method for the model parameters, and used the model to isolate the contributions of BERs and chain relaxation on the uniaxial stress-strain relation, stress relaxation, and glass transition behaviors. Assisted by the theoretical model, we presented detailed investigations on the effects of BERs and chain relaxation on the energy dissipation in the loading - unloading cycle, the degree of stress relaxation, as well the dynamic responses of CANs with different thermal-temporal conditions. The findings in this paper would provide theoretical guidance to assist in the design and fabrication of CAN based devices or structures.>
University of Colorado Denver.
Includes bibliographical references.
System Details:
System requirements: Adobe Reader.
Statement of Responsibility:
by Chaoqian Luo.

Record Information

Source Institution:
University of Colorado Denver
Holding Location:
Auraria Library
Rights Management:
Copyright Chaoqian Luo. Permission granted to University of Colorado Denver to digitize and display this item for non-profit research and educational purposes. Any reuse of this item in excess of fair use or other copyright exemptions requires permission of the copyright holder.
Resource Identifier:
on10762 ( NOTIS )
1076274500 ( OCLC )
LD1193.E55 2018m L96 ( lcc )


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