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Problem# 2 Hydrolytic degradation under physiological conditions of polyester of 3 - hydroxybutyrate ( 3 HB ) ( i . e . when y =
Problem#
Hydrolytic degradation under physiological conditions of polyester of hydroxybutyrate HB
ie when y and their random copolymers with hydroxyvalerate HV of different
percentage are measured. The structure of the polymers is shown. The degradation product of
the polyesters is predominantly hydroxybutyric acid. The wide angle Xray diffraction pattern
and polymer degradation data are presented below.
A Explain the characteristic physicochemical properties of these polymers with respect to their
molecular structure
B Based on the degradation data, are these polymers exhibiting bulk or surface erosion. Use the
data to calculate the degradation rate constant density of all polymers are similar: gmcm
From the data, and calculations, explain whether the degradation is auto catalyzed, or nonauto
catalyzed.
C Based on physicochemical properties of these polymers explain the degradation
characteristics ie both kinetics and physical character of the degradationHydrolytic degradation under physiological conditions of polyester of hydroxybutyrate HB
ie when and their random copolymers with hydroxyvalerate of different
percentage are measured. The structure of the polymers is shown. The degradation product of
the polyesters is predominantly hydroxybutyric acid. The wide angle Xray diffraction pattern
and polymer degradation data are presented below.
A Explain the characteristic physicochemical properties of these polymers with respect to their
molecular structure
B Based on the degradation data, are these polymers exhibiting bulk or surface erosion. Use the
data to calculate the degradation rate constant density of all polymers are similar:
From the data, and calculations, explain whether the degradation is auto catalyzed, or nonauto
catalyzed.
C Based on physicochemical properties of these polymers explain the degradation
characteristics ie both kinetics and physical character of the degradation
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