Gradual change of conformational disorder

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Description

The basic step of crystallization of linear macromolecules is conformational ordering. If the ordering is completed during crystallization, the entropy of fusion is a measure of the gain of conformational disorder on melting. In this lecture the possibility is discussed that in some cases conformational order changes below the glass or disordering transitions (T{sub g} and T{sub d}, respectively). Changes in conformational order below T{sub g} were observed for some flexible macromolecules without side-chains, like polyethylene. Changes below T{sub d} are found among main-chain liquid-crystalline polymers, conformationally disordered (condis) crystals, and related small-molecule model-compounds.

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6 p.

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Wunderlich, B December 31, 1994.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 12 times . More information about this article can be viewed below.

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Description

The basic step of crystallization of linear macromolecules is conformational ordering. If the ordering is completed during crystallization, the entropy of fusion is a measure of the gain of conformational disorder on melting. In this lecture the possibility is discussed that in some cases conformational order changes below the glass or disordering transitions (T{sub g} and T{sub d}, respectively). Changes in conformational order below T{sub g} were observed for some flexible macromolecules without side-chains, like polyethylene. Changes below T{sub d} are found among main-chain liquid-crystalline polymers, conformationally disordered (condis) crystals, and related small-molecule model-compounds.

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6 p.

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OSTI as DE96009624

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  • International symposium on unsolved problems on polymer crystalization, Tokyo (Japan), 24-25 Oct 1994

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  • Other: DE96009624
  • Report No.: CONF-9410455--1
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 230378
  • Archival Resource Key: ark:/67531/metadc669680

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  • December 31, 1994

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  • June 29, 2015, 9:42 p.m.

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  • Aug. 23, 2016, 3:03 p.m.

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Wunderlich, B. Gradual change of conformational disorder, article, December 31, 1994; Tennessee. (digital.library.unt.edu/ark:/67531/metadc669680/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.