N N
O
O
O
O
N
H N
H
O
O
O
O
N
H
N
H
O
O
N
H
O
O
-O
n
O
-O
O
O
Acceptor
Donor
A
D
A
D
A
D
A schematic representation of the folded structure
of the polymer
Isotropic interactions
leads to
self-association
Directional interactions
could lead to
self-assembly
Donor Acceptor
Directed versus undirected collapse
A
D
A
D
A
D
A
D
A
D
A
D
A A
D D
A A
D D
A A
D D
Fig. 15.2.
Self-association versus self-assembly.
15.3 Polymer Conformational Control 483