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Some general features of Tg-M relations for oligomers and amorphous polymers by J.M.G. Cown is a Materials Science article available to read on EtoBox.
What is Some general features of Tg-M relations for oligomers and amorphous polymers about?
The glass transition temperatures for a number of oligomers and polymers have been measured as a function of chain length. Analysis of these results, in conjunction with similar published data. has revealed that a plot of T.q against log \ (where v is the number of chain segments) can be divided into three distinct regions. These are: Region I where the asymptotic value of T.q has been reached. Region 11 where 7~i becomes chain length dependent and Region III in which the substance is still in its oligomeric form and 723 is even more chain length dependent. The boundar.~ conditions defining the limits of these regions are embodied in the equations Tg( -'-) = 372.6 log "g -595. which is the boundary between Regions l and II and ~](zt ) = 761.51og 'co -681"8. which delineates the oligomeric and polymeric Regions Ill and II. These relations allo,\* one to esumate at what molecular weight the limiting value of 77a is achieved for a given polymer and where the oligomer polymer transition zone is likely to occur
Who reads Some general features of Tg-M relations for oligomers and amorphous polymers?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- J.M.G. Cown
- Publisher
- Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0014-3057)
- Published
- 1975
- Language
- EN
- Field
- Materials Science (Physical Sciences)