Abstract/Details

Thermal stability of polymers: Relation to cross -linking and nanocomposite formation


2002 2002

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Abstract (summary)

The focus of this research has been on the effect of cross-linking and nanocomposite formation on the thermal stability of polymers. Chapter I gives a brief introduction on the processes occurring during degradation and test methods used to determine thermal stability of polymers.

Research on cross-linking of polymers is presented in Chapters II and III. Chapter II examines the effect of cross-linking on thermal stability of polybutadiene while Chapter III examines cross-linking of poly(methyl methacrylate) and polystyrene. From this work and previous work it has been shown that it is the size and type of cross-link that is important for enhanced thermal stability rather than the number of cross-links. Thanks are extended to G. F. Levchik and S. V. Levchik for obtaining the TGA and DSC data and mechanistic input in the work done in Chapter III and to C. Dick, J. J. Liggat, and C. E. Snape for doing solid state NMR on these cross-linked polymers.

Chapters IV through VII examine the effect of nanocomposite formation on thermal stability of polymers. In particular graphite nanocomposites where the type of graphite used is in the following forms; potassium graphite (Chapter IV), expandable graphite (Chapters V and VI), and modified graphite oxides (Chapter VII). The research presented here shows that graphite-nanocomposites behave similarly to clay-nanocomposites in that a reduction in PHRR is observed and thermal stability is similar. There does appear to be a difference in the time to ignition for graphite-nanocomposites and the mechanical properties are not enhanced as one might have expected. Thanks is given to Qiang (John) Yao who preformed the dynamic mechanical testing (DMA) on these nanocomposites.

Indexing (details)


Subject
Polymers
Classification
0495: Polymers
Identifier / keyword
Pure sciences; Cross-linking; Fire retardancy; Nanocomposite; Polymers; Thermal stability
Title
Thermal stability of polymers: Relation to cross -linking and nanocomposite formation
Author
Uhl, Fawn Marie
Number of pages
182
Publication year
2002
Degree date
2002
School code
0116
Source
DAI-B 64/01, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780493999937, 0493999930
Advisor
Wilkie, Charles A.
University/institution
Marquette University
University location
United States -- Wisconsin
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3078901
ProQuest document ID
305521499
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305521499
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