Biomedical Engineering Reference
In-Depth Information
Scheme 23
Glycogen-like molecular architecture of
hb
-PAPs
those internal diynes with proper head groups and spacer lengths produce
completely soluble, high molecular weight polymers.
2.4.2
Hyperbranched Polyarylenes
As discussed above, changing the diyne position from terminal to internal
isonewaytochangethenatureofthehyperbranchedpolymers.Morepro-
found changes can be brought about by replacing the aliphatic spacers with
aryl rings. Different from the isolated benzene rings in the
hb
-PAPs, here
the “new” benzene rings formed by the polycyclotrimerization help the “old”
aromatic rings to interconnect into conjugated
hb
-PAs (Scheme 24).
