Chemistry Reference
In-Depth Information
the preceding paragraph. Others focus on differences between the nonpo-
lar alkyl groups and the polar Si-O backbone,
293
or the very high rota-
tional and oscillatory freedom of the methyl side groups in PDMS, the
most important of the polysiloxanes.
298
Still another focuses on the chain's
irregular cross section (very large at the substituted Si atom and very
small at the unsubstituted O atoms.)
271
Another possible explanation is
the fact that chains with unequal skeletal bond angles would not pack
easily
299
since they would not be able to form the planar zig-zag conforma-
tions of polymers such as polyethylene.
Additional work in this area will almost certainly involve supramolecu-
lar structures.
300,
301
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