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Turbidity is developed in an amylose solution after a certain time, known
as the cloud time [181]. The cloud time increases with increasing temperature
and is almost infinite at 42°C [181]. An increase in G′is observed during the
precede the increase in G′or lag behind, depending on the amylose chain
length [182]. The development of turbidity indicates aggregation; a phase
separation into a polymer-rich phase and a polymer-deficient phase occurs. It
has been suggested that gelation occurs due to entanglement in the polymerrich phase [115]. The critical concentration for gelation, C0
, of amylose has
been determined to be approximately 0.9 to 1%, and this value was found to
be independent of chain length, at least in monodisperse amylose samples
[181,183].
After the network is established, its strength improves with time. The
changes with time are attributed to crystallization in the polymer-rich phase
[147], and the B-pattern can be measured by x-ray diffraction [183]; however,
© 2006 by Taylor & Francis Group, LLC
same time as the clouding (Figure 10.7) [181]. The increase in turbidity might
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