10.1021/acs.jpcb.6b08536.s001
Xiaodong Qi
Xiaodong
Qi
Yilan Guo
Yilan
Guo
Yuan Wei
Yuan
Wei
Peng Dong
Peng
Dong
Qiang Fu
Qiang
Fu
Multishape and Temperature Memory Effects by Strong
Physical Confinement in Poly(propylene carbonate)/Graphene Oxide Nanocomposites
American Chemical Society
2016
Strong Physical Confinement
T sw
shape memory performances
DSME
tunable multishape memory effect
triple-shape memory effect
temperature memory effect
filler
content
wt
dual-shape memory effect
nanoconfinement effect
SME
Temperature Memory Effects
PPC
TSME
T prog
2016-10-04 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Multishape_and_Temperature_Memory_Effects_by_Strong_Physical_Confinement_in_Poly_propylene_carbonate_Graphene_Oxide_Nanocomposites/4029354
The
importance of filler–matrix interactions is generally
recognized for mechanical property enhancement; their direct impact
by physical confinement on diverse functional properties has remained
poorly explored. We report here our effort in achieving versatile
shape memory performances for a biodegradable poly(propylene carbonate)
(PPC) matrix containing high contents of graphene oxide (GO). The
excellent dispersion in the
entire filler range (up to 20 wt %) allows precise morphological tuning,
along with physical filler–matrix interactions, contributing
overall to a strong nanoconfinement effect that positively affects
the thermomechanical properties of nanocomposites. Only one glass-transition
temperature (<i>T</i><sub>g</sub>) of PPC is detected when
the GO content is below 10 wt %, corresponding to a slightly confined
system, whereas two distinct <i>T</i><sub>g</sub>’s
are observed with a GO content over 10 wt %, corresponding to a highly
confined system. As such, a tunable multishape memory effect can be
achieved simply by tuning the filler contents. A dual-shape memory
effect (DSME) is observed for a slightly confined system, whereas
a triple-shape memory effect (TSME) can be achieved by deformation
at two distinct <i>T</i><sub>g</sub>’s for a highly
confined system. More importantly, it is interesting to find that
the switch temperature (<i>T</i><sub>sw</sub>) evolves linearly
with the programing temperature (<i>T</i><sub>prog</sub>) for both slightly and highly confined systems, with <i>T</i><sub>sw</sub> ≈ <i>T</i><sub>prog</sub> for a highly
confined system but <i>T</i><sub>sw</sub> < <i>T</i><sub>prog</sub> for a slightly confined system. Our work suggests
a highly flexible approach to take advantage of the strong nanoconfinement
effect by tuning the content of GO within a single polymer to access
versatile SMEs, such as DSME and TSME, and the temperature memory
effect.