Thermal Properties of Aliphatic Polypeptoids

Corinna Fetsch, Robert Luxenhofer

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

A series of polypeptoid homopolymers bearing short (C1-C5) side chains of degrees of polymerization of 10-100 are studied with respect to thermal stability, glass transition and melting points. Thermogravimetric analysis of polypeptoids suggests stability to >200 °C. The study of the glass transition temperatures by differential scanning calorimetry revealed two dependencies. On the one hand an extension of the side chain by constant degree of polymerization decrease the glass transition temperatures (Tg) and on the other hand a raise of the degree of polymerization by constant side chain length leads to an increase of the Tg to a constant value. Melting points were observed for polypeptoids with a side chain comprising not less than three methyl carbon atoms. X-ray diffraction of polysarcosine and poly(N-ethylglycine) corroborates the observed lack of melting points and thus, their amorphous nature. Diffractograms of the other investigated polypeptoids imply that crystalline domains exist in the polymer powder. © 2013 by the authors.
Original languageEnglish (US)
Pages (from-to)112-127
Number of pages16
JournalPolymers
Volume5
Issue number1
DOIs
StatePublished - Jan 29 2013
Externally publishedYes

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