TY  - JOUR
A1  - Demirel, A. Levent
A1  - Guner, Pinar Tatar
A1  - Verbraeken, Bart
A1  - Schlaad, Helmut
A1  - Schubert, Ulrich S.
A1  - Hoogenboom, Richard
T1  - Revisiting the Crystallization of Poly(2-alkyl-2-oxazoline)s
JF  - Journal of polymer science : B, Polymer physics
N2  - Poly(2-alkyl-2-oxazoline)s (PAOx) exhibit different crystallization behavior depending on the length of the alkyl side chain. PAOx having methyl, ethyl, or propyl side chains do not show any bulk crystallization. Crystallization in the heating cycle, that is, cold crystallization, is observed for PAOx with butyl and pentyl side chains. For PAOx with longer alkyl side chains crystallization occurs in the cooling cycle. The different crystallization behavior is attributed to the different polymer chain mobility in line with the glass transition temperature (T-g) dependency on alkyl side chain length. The decrease in chain mobility with decreasing alkyl side chain length hinders the relaxation of the polymer backbone to the thermodynamic equilibrium crystalline structure. Double melting behavior is observed for PButOx and PiPropOx which is explained by the melt-recrystallization mechanism. Isothermal crystallization experiments of PButOx between 60 and 90 degrees C and PiPropOx between 90 and 150 degrees C show that PAOx can crystallize in bulk when enough time is given. The decrease of Tg and the corresponding increase in chain mobility at T > T-g with increasing alkyl side chain length can be attributed to an increasing distance between the polymer backbones and thus decreasing average strength of amide dipole interactions. (C) 2015 Wiley Periodicals, Inc.
KW  - chain mobility
KW  - crystallization
KW  - differential scanning calorimetry (DSC)
KW  - effect of alkyl side chains
KW  - glass transition temperature
KW  - melt
KW  - melt-recrystallization
KW  - polymer crystallization
Y1  - 2016
U6  - https://doi.org/10.1002/polb.23967
SN  - 0887-6266
SN  - 1099-0488
VL  - 54
SP  - 721
EP  - 729
PB  - Wiley-Blackwell
CY  - Hoboken
ER  - 
TY  - GEN
A1  - Hoogenboom, Richard
A1  - Schlaad, Helmut
T1  - Thermoresponsive poly(2-oxazoline)s, polypeptoids, and polypeptides
N2  - This review covers the recent advances in the emerging field of thermoresponsive polyamides or polymeric amides, i.e., poly(2-oxazoline)s, polypeptoids, and polypeptides, with a specific focus on structure–thermoresponsive property relationships, self-assembly, and applications.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 328 
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-395022
ER  -