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Normal modes and their dispersion are obtained for planar-zigzag form II (tttt) of syndiotactic polypropylene (sPP) in the reduced zone scheme using Urey–Bradley force field and Wilson's GF matrix method as modified by Higgs. It is observed that this all trans backbone conformation can be characteristized by a band at 1233cm −1 (calculated at 1239cm −1 ). A comparison is made with...
Normal mode of vibration and their dispersion for poly(ε-caprolactone) (PCL) chain have been obtained by using Urey-Bradley force field and the Wilson's GF matrix method as modified by Higgs. Characteristic features of the dispersion curves such as crossing, repulsion and regions of high density-of-states have been explained. Heat capacity measurements have been interpreted and the limitations of...
Polyglycolic acid (PGA) (-CH 2 -COO-) n is the first bioresorbable synthetic polymer which is used to make biomedical and pharmaceutical devices. It has a planar zigzag conformation. A comprehensive study of the normal modes and their dispersion in PGA using Urey Bradley force field is being reported. Characteristic features of the dispersion curves have been reported. The heat capacity...
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