Chemistry Reference
In-Depth Information
Table 3. 3
(CONTINUED)
Value of property for
cyclics relative to linears Reference
Property
Polymer
Dipole moments
“
Lower
362
Particle scattering
functions (Monte
Carlo)
“
Cyclics show maxima
363
Surface pressures
of monolayers
“
Higher plateau levels
364
Glass transition
temperatures
“
Higher
305
Crystallization
“
Only low M cyclics and
linear chains resist
crystallization
365
Lower critical
solution
temperatures
“
Higher
366
Upper critical
solution
temperatures
“
Lower
367
Critical masses
for entangling
“
No significant difference
368-369
Densities
“
Higher
370
Adsorption
onto silica
“
Higher at low M, but lower
at high M
371
Chain length
dependence of α
transition
temperatures
“
Increase for cyclics but
decrease for linear chains
372
Gel permeation
chromatography
Poly(phenylmethylsiloxane)
Both gave sharp fractions
373
Radii of gyration
from neutron
scattering
“
Lower
374 -376
Glass transition
temperatures
“
Higher
377
Dielectric
relaxations
“
Cyclics have higher
dipolar cancellations
378
Intrinsic viscosities
Poly(vinylmethylsiloxane)
Lower
379
Bulk viscosities
“
Higher at low M
379
Densities
“
Higher
379
Glass transition
temperatures
“
Higher
379
