Award Date

1-1-2002

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Physics

First Committee Member

James Selser

Number of Pages

70

Abstract

It is shown that using PCS the detection and characterization of the overall internal relaxation mode of high molecular weight, narrow molecular weight distribution PEO in methanol with and without the presence of LiClO 4 is so difficult as to be impractical. Moreover, PCS analysis proved to be extremely sensitive to small differences in data quality which further decreased the reliability of measurements. Nevertheless, the results of the present study were sufficiently good to allow a meaningful comparison between experiment and theory and to reveal useful new information about the effect of LiClO4 on PEO coil internal behavior in methanol solution. Sample preparation techniques and the equipment required to successfully make the measurements allowing for quantitative analysis of the overall internal mode are also described. Furthermore, the particular importance of the high molecular weight of the PEO sample of about one million Daltons combined with a narrow molecular weight distribution is presented and discussed. Restated, the results of this work while informative and useful show that using PCS investigations of PEO in methanol, regardless of the presence if LiClO4 is feasible but impractical for obtaining detailed, accurate and quantitative information relating to the overall internal relaxation mode of this linear, flexible polymer.

Keywords

Dynamic; Ethylene; Internal; Liclo4; Lithium; Methanol; Mode; Overall; Oxide; Perchlorate; Poly; Study

Controlled Subject

Molecular dynamics

File Format

pdf

File Size

2037.76 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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