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- W2895577076 endingPage "8126" @default.
- W2895577076 startingPage "8114" @default.
- W2895577076 abstract "The uniaxial mechano-optical behavior of a series of amorphous l-valine-based poly(ester urea) (VAL-PEU) with varying diol lengths was studied to elucidate the molecular mechanism associated with their thermal shape memory properties. A custom, real-time measurement system was used to capture the true stress, true strain, and birefringence during the temporary shape programming at stretching temperatures above the glass transition temperature (Tg). The mechano-optical response of VAL-PEUs exhibits an initial photoelastic behavior related to enhanced segmental correlation at low temperatures above the Tg. A characteristic temperature, defined as the liquid–liquid (Tll) transition (rubbery–viscous transition), was found at about 1.05 Tg (K) (at Tg + 15 °C) at strain rate of 0.017 s–1, above which the segmental contacts largely “melt” and the initial slope of the stress-optical curves becomes temperature independent. This temperature corresponds to the temperature where mean relaxation time for the polymer is maximized. Real-time infrared spectroscopy (IR) and in situ wide-angle X-ray scattering (WAXS) revealed a strain-induced intersegmental structural change during stretching. The intermolecular hydrogen bonding between the urea–urea and/or urea–carbonyl groups was found to adopt different bonding modes at the onset of strain hardening with a concurrent increased separation distance between adjacent segments. The hydrogen bonding strengthened supramolecular packing. The compromised shape recovery is a result of the disruption of the rigid segmental correlation, induced either by large extension at T < Tll or by progressive thermal effects at T > Tll, both of which may be minimized at Tll." @default.
- W2895577076 created "2018-10-12" @default.
- W2895577076 creator A5001085706 @default.
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- W2895577076 creator A5049545725 @default.
- W2895577076 creator A5079388943 @default.
- W2895577076 creator A5080455025 @default.
- W2895577076 date "2018-10-04" @default.
- W2895577076 modified "2023-10-14" @default.
- W2895577076 title "Nonlinear Mechano-Optical Behavior and Strain-Induced Structural Changes of <scp>l</scp><i>-</i>Valine-Based Poly(ester urea)s" @default.
- W2895577076 cites W138943016 @default.
- W2895577076 cites W1487823862 @default.
- W2895577076 cites W1964032218 @default.
- W2895577076 cites W1964776919 @default.
- W2895577076 cites W1967634414 @default.
- W2895577076 cites W1974083654 @default.
- W2895577076 cites W1975852762 @default.
- W2895577076 cites W1979414114 @default.
- W2895577076 cites W1984284436 @default.
- W2895577076 cites W1992755218 @default.
- W2895577076 cites W1994377912 @default.
- W2895577076 cites W1994791859 @default.
- W2895577076 cites W1996748661 @default.
- W2895577076 cites W1997087981 @default.
- W2895577076 cites W1997222105 @default.
- W2895577076 cites W1997374002 @default.
- W2895577076 cites W2005675736 @default.
- W2895577076 cites W2007560023 @default.
- W2895577076 cites W2008948202 @default.
- W2895577076 cites W2009804315 @default.
- W2895577076 cites W2016589761 @default.
- W2895577076 cites W2017131866 @default.
- W2895577076 cites W2017569023 @default.
- W2895577076 cites W2019067877 @default.
- W2895577076 cites W2019531970 @default.
- W2895577076 cites W2019985763 @default.
- W2895577076 cites W2021017323 @default.
- W2895577076 cites W2021041880 @default.
- W2895577076 cites W2021951323 @default.
- W2895577076 cites W2023449521 @default.
- W2895577076 cites W2025199197 @default.
- W2895577076 cites W2027046823 @default.
- W2895577076 cites W2028579456 @default.
- W2895577076 cites W2028831705 @default.
- W2895577076 cites W2029048369 @default.
- W2895577076 cites W2029634365 @default.
- W2895577076 cites W2030841140 @default.
- W2895577076 cites W2033207906 @default.
- W2895577076 cites W2034566205 @default.
- W2895577076 cites W2037861799 @default.
- W2895577076 cites W2038176362 @default.
- W2895577076 cites W2043311528 @default.
- W2895577076 cites W2044425228 @default.
- W2895577076 cites W2045137504 @default.
- W2895577076 cites W2046929255 @default.
- W2895577076 cites W2047924253 @default.
- W2895577076 cites W2051660661 @default.
- W2895577076 cites W2056256746 @default.
- W2895577076 cites W2058134991 @default.
- W2895577076 cites W2061055395 @default.
- W2895577076 cites W2066091683 @default.
- W2895577076 cites W2076076911 @default.
- W2895577076 cites W2080302067 @default.
- W2895577076 cites W2080943054 @default.
- W2895577076 cites W2082236851 @default.
- W2895577076 cites W2085789422 @default.
- W2895577076 cites W2086250608 @default.
- W2895577076 cites W2088311110 @default.
- W2895577076 cites W2093173640 @default.
- W2895577076 cites W2094456859 @default.
- W2895577076 cites W2094489484 @default.
- W2895577076 cites W2107072550 @default.
- W2895577076 cites W2107906812 @default.
- W2895577076 cites W2121648403 @default.
- W2895577076 cites W2141411612 @default.
- W2895577076 cites W2148649213 @default.
- W2895577076 cites W2162081039 @default.
- W2895577076 cites W2165212583 @default.
- W2895577076 cites W2166701602 @default.
- W2895577076 cites W2274962757 @default.
- W2895577076 cites W2300049290 @default.
- W2895577076 cites W2315410443 @default.
- W2895577076 cites W2329511366 @default.
- W2895577076 cites W2330214967 @default.
- W2895577076 cites W2330266849 @default.
- W2895577076 cites W2340347809 @default.
- W2895577076 cites W2507666455 @default.
- W2895577076 cites W2521439331 @default.
- W2895577076 cites W2528377629 @default.
- W2895577076 cites W2581183229 @default.
- W2895577076 cites W2598278710 @default.
- W2895577076 cites W2615775944 @default.
- W2895577076 cites W2757917053 @default.
- W2895577076 cites W2788391323 @default.
- W2895577076 cites W4244569713 @default.
- W2895577076 cites W4246477490 @default.
- W2895577076 cites W584079020 @default.