Journal
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume 51, Issue 12, Pages 966-977Publisher
WILEY
DOI: 10.1002/polb.23295
Keywords
biomimetic; fillers; polyurethanes
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Funding
- National Science Foundation [CMMI 0900064]
- NASA [NNX11AM17A]
- Louisiana Board of Regents [NASA/LEQSF(2011-14)-Phase3-05]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0900064] Funding Source: National Science Foundation
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In this study, shape-memory polyurethane (SMPU) fibers were strain hardened by cold-drawing programming (CDP) process. The programmed fibers are experimentally studied on the physical and thermomechanical properties. Structural relaxation, which determines shape memory capability of the SMP fibers, is quantified by conformational entropy change. Based on the entanglement tube theory and reptation theory, the entropic force is derived as a bridge to link the stress relaxation and structural relaxation, and thus structural relaxation can be evaluated by stress relaxation. It was found that the CDP SMPU fibers would still have good crackclosing capability after 13 years of hibernation in polymer matrix composite. (c) 2013 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2013, 51, 966-977
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