Microwave-Assisted Synthesis of a 42-Membered Library of Diblock Copoly(2-oxazoline)s and Chain-Extended Homo Poly(2-oxazoline)s and Their Thermal Characterization

F.D. Wiesbrock, R. Hoogenboom, M.A.M. Leenen, S.F.G.M. Nispen, van, M. Loop, van der, C.H. Abeln, A.M.J. Berg, van den, U.S. Schubert

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

133 Citaten (Scopus)

Samenvatting

A library of 4 chain-extended homo- and 12 diblock copoly(2-oxazoline)s was prepared from 2-methyl-, 2-ethyl-, 2-nonyl-, and 2-phenyl-2-oxazoline within less than a day (total net reaction time). The living cationic ring-opening polymerization was initiated by methyl tosylate and performed in acetonitrile at 140 °C in a single-mode microwave reactor. A total number of 100 (50 + 50) monomer units was incorporated into the respective polymer chains; the thus-obtained 16 polymers exhibited narrow average molecular weight distributions (PDI <1.30). All compounds were stable up to temperatures of (at least) 300 °C. The subsequent determination of the glass-transition temperatures and the specific heats revealed a significant influence of the type of substituents attached to the polymers' backbones: the glass-transition temperature as well as the corresponding specific heat increased with an increasing rigidity of the substituents in the polymer (phenyl/methyl vs nonyl/ethyl).
Originele taal-2Engels
Pagina's (van-tot)7957-7966
TijdschriftMacromolecules
Volume38
Nummer van het tijdschrift19
DOI's
StatusGepubliceerd - 2005

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