Electron Microscopy And Small Angle X-Ray Studies Of Amorphous Polymers

Donald R Uhlmann, G. Kritchevsky, J. Vander Sande

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The small-angle X-ray scattering (SAXS) from polycarbonate, polymethyl methacrylate, and polyethylene terephthalate seem in-consistent, both in the magnitude of the SAXS intensity and in its variation with scattering angle, with nodular features as representative of the bulk polymers. Rather than nodules, the SAXS data indicate the presence of thermal density fluctuations frozen-in at the glass transitions, together with a small concentration of large heterogeneities (hundreds to thousands of angstroms in size).Electron microscopy (EM) of amorphous polycarbonate provides further support for the suggestion that nodular features are not representative of the bulk material. The only structure seen in bright field is the “salt and pepper” background common to all materials. In dark field, very small structures (

Original languageEnglish (US)
Pages (from-to)153-172
Number of pages20
JournalJournal of Macromolecular Science, Part B
Volume12
Issue number2
DOIs
StatePublished - Jan 1 1976
Externally publishedYes

Fingerprint

polycarbonate
X ray scattering
Electron microscopy
electron microscopy
Polymers
Polycarbonates
X rays
polymers
polycarbonates
scattering
Polyethylene Terephthalates
x rays
Polymethyl Methacrylate
peppers
Polymethyl methacrylates
Polyethylene terephthalates
Glass transition
nodules
polyethylene terephthalate
Salts

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry
  • Polymers and Plastics
  • Condensed Matter Physics

Cite this

Electron Microscopy And Small Angle X-Ray Studies Of Amorphous Polymers. / Uhlmann, Donald R; Kritchevsky, G.; Sande, J. Vander.

In: Journal of Macromolecular Science, Part B, Vol. 12, No. 2, 01.01.1976, p. 153-172.

Research output: Contribution to journalArticle

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