%0 Journal Article
%A Allgaier, J.
%A Hövelmann, Claas
%A Wei, Zhang
%A Staropoli, Mariapaola
%A Pyckhout-Hintzen, Wim
%A Lühmann, Nicole
%A Willbold, Sabine
%T Synthesis and rheological behavior of poly(1,2-butylene oxide) based supramolecular architectures
%J RSC Advances
%V 6
%N 8
%@ 2046-2069
%C London
%I RSC Publishing
%M FZJ-2016-01456
%P 6093 - 6106
%D 2016
%X In this work we present the synthesis of poly(1,2-butylene oxide) (PBO) functionalized with the complementary hydrogen bond forming groups 2,4-diaminotriazine (DAT) and thymine. PBO is a rubbery polymer. Due to its semi-polar nature PBO is expected to suppresses non-directed cluster formation of the supramolecular groups but not influence their directed interactions. For the synthesis of backbone functionalized polymers we developed a procedure which allowed randomly copolymerizing BO with 1,2-epoxy-7-octene using anionic ring opening polymerization with potassium tert-butanolate as initiator. The vinyl groups were converted to OH-groups by oxidation. In addition, PBO with one alcoholic end group was obtained by homopolymerization of BO. For the variant with OH-groups at both chain ends a procedure was developed which was based on the cleavage of the tert-butyl initiator group. In all the polymers the alcohol groups were basically quantitatively transformed into NH2-groups. DAT and thymine functionalities were attached to the NH2-groups again in almost quantitative conversion. All reaction steps were monitored by 1H-NMR using pyridine-d5 as solvent. This method allowed determining the conversions of the different synthesis steps with high precision. The materials were examined in linear rheology in order to study the effect of the hydrogen-bonds on the dynamics of the resulting supramolecular structures. The results corroborate the exclusive existence of directed interactions between the supramolecular groups.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000368858000013
%R 10.1039/C5RA24547H
%U https://juser.fz-juelich.de/record/281787