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Thermal Properties of Aliphatic Polypeptoids
Professur für Makromolekulare Chemie, Department Chemie, Technische Universität Dresden, Zellescher Weg 19, 01062 Dresden, Germany
Functional Polymer Materials, Chair of Chemical Technology of Materials Synthesis, University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
* Author to whom correspondence should be addressed.
Received: 19 December 2012; in revised form: 18 January 2013 / Accepted: 21 January 2013 / Published: 29 January 2013
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.
Keywords: peptoid; biomaterials; glass transition temperature; DSC; TGA; XRD
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Fetsch, C.; Luxenhofer, R. Thermal Properties of Aliphatic Polypeptoids. Polymers 2013, 5, 112-127.
Fetsch C, Luxenhofer R. Thermal Properties of Aliphatic Polypeptoids. Polymers. 2013; 5(1):112-127.
Fetsch, Corinna; Luxenhofer, Robert. 2013. "Thermal Properties of Aliphatic Polypeptoids." Polymers 5, no. 1: 112-127.