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Raman longitudinal acoustic mode (LAM) studies of folded-chain morphology in poly(ethylene oxide) (PEO). I. Normal mode analysis of LAM of a helical-chain oligomer of PEO

✍ Scribed by Kigook Song; Samuel Krimm

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
859 KB
Volume
28
Category
Article
ISSN
0887-6266

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✦ Synopsis

Abstract

Normal mode analyses were done for the exact structures of model oligomers of PEO to investigate the longitudinal acoustic mode (LAM) in this helical polymer. It quickly became apparent that it is impossible to reproduce observed LAM frequencies without incorporating explicit interchain interactions. We have developed a force field that includes interchain interactions through an atom‐atom potential and have shown that this force field reproduces very well the observed LAM frequencies of helical‐chain oligomers of PEO. This result indicates that the LAM of helical chains is much more sensitive to intermolecular interactions than that of planar zigzag chains.

📜 SIMILAR VOLUMES

Raman longitudinal acoustic mode (LAM) s
Raman longitudinal acoustic mode (LAM) studies of folded-chain morphology in poly(ethylene oxide) (PEO). II. Normal mode analysis of folded-chain structures of PEO
✍ Kigook Song; Samuel Krimm 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 544 KB

## Abstract Normal mode calculations were carried out on model folded‐chain molecules to determine the effect of a fold on the LAM of PEO. The presence of a chain fold results in a decrease in the LAM frequency and intensity, the change in frequency being very much smaller than the change in intens