Molecules with Shape Memory Based on Restricted Rotation
摘要:
[GRAPHICS]Dilmide 1 and octaimide 2 both adopt two stable conformations at room temperature as a result of restricted rotation about two C-aryl-N-imide single bonds, a compact "folded" and an open "unfolded" structure. Predictable ratios of folded and unfolded rotamers can be achieved by heating in solvents of appropriate polarity as measured by the Reichardt's parameter (E-T30). On cooling to room temperature, the resulting conformational changes are "locked in" as restricted rotation is reestablished.
Molecules with Shape Memory Based on Restricted Rotation
摘要:
[GRAPHICS]Dilmide 1 and octaimide 2 both adopt two stable conformations at room temperature as a result of restricted rotation about two C-aryl-N-imide single bonds, a compact "folded" and an open "unfolded" structure. Predictable ratios of folded and unfolded rotamers can be achieved by heating in solvents of appropriate polarity as measured by the Reichardt's parameter (E-T30). On cooling to room temperature, the resulting conformational changes are "locked in" as restricted rotation is reestablished.
A composition containing a) a natural or synthetic polymer and b) one or more compounds of the formula (I), (II) or (III) wherein R
1
, R
2
and R
3
or Y
1
, Y
2
and Y
3
or Z
1
, Z
2
and Z
3
are e.g. branched C
3
-C
20
alkyl.
A composition containing a) a natural or synthetic polymer and b) one or more compounds of the formula (I), (II) or (III) wherein R1, R2 and R3 or Y1, Y2 and Y3 or Z1, Z2 and Z3 are e.g. branched C3-C20alkyl.