Abstract/Details

Characterization of structural transformations with vibrational spectroscopy


1999 1999

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Abstract (summary)

The work presented in this thesis applies primarily the techniques of Raman and infrared spectroscopy to characterize the structural transformations in polymers. An overview of the problems studied is given in Chapter 1. Particular emphasis is given to mainly syndiotactic polypropylene structural transformations influenced by configurational defects (Chapter 2), and thermal history and mechanical deformation (Chapter 3). In Chapter 4, the influence of a confining surface in the structural transformation of poly(dimethyl siloxane) Langmuir films at the air-water interface is characterized.

Using a combination of Raman spectroscopy, and normal coordinate analysis of both ordered and disordered chains, it was possible to relate the Raman spectrum to the amorphous phase and ordered phase structures. With this relationship, it was possible to directly relate the Raman spectrum to the population of meso(isotactic) defects in mainly syndiotactic polypropylene. In addition, time, temperature, and mechanical stretching-dependent transformations were characterized.

With external reflectance infrared spectroscopy, it was possible to characterize chain conformation and the local environment of the polymer backbone. Dependence of band intensity and frequency was related to the average segmental orientation and the proximity of the water surface.

Indexing (details)


Subject
Polymers;
Chemistry
Classification
0495: Polymers
0494: Chemistry
Identifier / keyword
Pure sciences, Configuration defects, Polypropylene, Structural transformations, Syndiotactic
Title
Characterization of structural transformations with vibrational spectroscopy
Author
Hahn, Thomas D.
Number of pages
239
Publication year
1999
Degree date
1999
School code
0118
Source
DAI-B 60/02, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780599199361, 0599199369
Advisor
Hsu, Shaw Ling
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9920606
ProQuest document ID
304516290
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304516290
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