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Problem# 2 Hydrolytic degradation under physiological conditions of polyester of 3 - hydroxybutyrate ( 3 HB ) ( i . e . when y =

Problem#2
Hydrolytic degradation under physiological conditions of polyester of 3-hydroxybutyrate (3HB)
(i.e. when y=0) and their random copolymers with 3-hydroxyvalerate (3HV) of different
percentage are measured. The structure of the polymers is shown. The degradation product of
the polyesters is predominantly 3-hydroxybutyric acid. The wide angle X-ray 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: 1.22 gm/cm3).
From the data, and calculations, explain whether the degradation is auto catalyzed, or non-auto
catalyzed.
C. Based on physicochemical properties of these polymers explain the degradation
characteristics (i.e. both kinetics and physical character of the degradation).Hydrolytic degradation under physiological conditions of polyester of 3-hydroxybutyrate (3HB)
(i.e. when y=0) and their random copolymers with 3-hydroxyvalerate (3HV) of different
percentage are measured. The structure of the polymers is shown. The degradation product of
the polyesters is predominantly 3-hydroxybutyric acid. The wide angle X-ray 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: 1.22gmcm3).
From the data, and calculations, explain whether the degradation is auto catalyzed, or non-auto
catalyzed.
C. Based on physicochemical properties of these polymers explain the degradation
characteristics (i.e. both kinetics and physical character of the degradation).
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