Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/13527
Title: Effect of Cross-Link Density on Photoplasticity of Epoxide Networks Containing Allylic Dithioether Moieties
Contributor(s): Cook, Wayne D (author); Schiller, Tara (author); Chen, Fei (author); Moorhoff, Cornelis (author); Thang, San H (author); Bowman, Christopher N (author); Scott, Timothy F (author)
Publication Date: 2012
DOI: 10.1021/ma301557z
Handle Link: https://hdl.handle.net/1959.11/13527
Abstract: A new diepoxide monomer (ADTDE) containing an allylic dithioether moiety has been synthesized to extend the suite of monomers that form networks exhibiting radical-mediated photoplasticity. These cross-linked polymers show permanent shape change under load and stress relax only when under the stimulus of visible or UV radiation. The Lewis base-catalyzed reaction of the epoxide groups in ADTDE with tri- and tetrafunctional thiols was monitored by differential scanning calorimetry and infrared spectroscopy. These curing systems were found to be more efficient than anionic, cationic, or anhydride polymerizations. The dynamic mechanical thermal analysis of ADTDE with the tetrathiol showed that the network was rubbery at room temperature which is considered ideal for the demonstration of photoplasticity. The photoinduced creep behavior was shown to be controlled by the presence of active free radicals in the matrix - on cessation of irradiation, the creep was terminated. The stress relaxation of the stretched network specimens during UV irradiation was studied and was found to be similar to that shown previously for thiol-vinyl ether networks. As expected, the cross-link density of networks prepared from ADTDE with the trithiol was lower than that formed with the tetrathiol and this was found to have a significant influence on the rate and extent of photoplasticity observed - the less highly cross-linked ADTDE/trithiol system exhibited more rapid and more extensive photoplasticity since it contained fewer network strands.
Publication Type: Journal Article
Source of Publication: Macromolecules, 45(24), p. 9734-9741
Publisher: American Chemical Society
Place of Publication: United States of America
ISSN: 1520-5835
0024-9297
Fields of Research (FoR) 2008: 030399 Macromolecular and Materials Chemistry not elsewhere classified
030302 Nanochemistry and Supramolecular Chemistry
030306 Synthesis of Materials
Fields of Research (FoR) 2020: 340399 Macromolecular and materials chemistry not elsewhere classified
340207 Metal organic frameworks
Socio-Economic Objective (SEO) 2008: 970103 Expanding Knowledge in the Chemical Sciences
Socio-Economic Objective (SEO) 2020: 280105 Expanding knowledge in the chemical sciences
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article

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