Crystallization in segregated supramolecular pseudoblock copolymers

Author(s)

Clement Appiah, Johanna-Masume Akbarzadeh Moghadam, Herwig Peterlik, Wolfgang H. Binder

Abstract

Crystallization in polymers under confinement can lead to strong effects, depending on the physical nature of the confining blocks. The present publication addresses crystallization in segregated supramolecular pseudoblock copolymers (SPBCPs, (PCL-Thy)-s-(PS-Tr)) where two constraints are present: one constraint is formed by a hydrogen bonding system connecting two microphase-segregating polymers, the second constraint is formed by the phase boundary of the segregating (PS)-polymer block. Thus mono-functionalized polymers bearing either a thymine end group or 2,4-diaminotriazine end group are prepared and blended together via the association of H-bonding interactions. Thymine functionalized crystallizable poly(ε-caprolactone) (PCL-Thy) and 2,4-diaminotriazine functionalized poly(styrene) (PS-Tr) with molecular weights ranging from 3000 g/mol to 6000 g/mol and 3000 g/mol to 11,000 g/mol respectively exhibit complete end group transformation as proven by NMR and MALDI methods. Crystallization studies via DSC experiments show a strong influence on the melting behavior of the PCL crystals upon attaching the PS block. Two distinct T

_gs (DSC studies) corresponding to the respective polymers (PCL and PS) are shown for SPBCPs with higher PS block ratio, while 'cold crystallization' is shown for samples with nearly equal volume fraction of PCL and PS blocks. In-situ temperature dependent SAXS studies of the SPBCPs indicates a confinement effect of the PS-blocks on the crystallization of PCL, leading to an ordered arrangement of the PCL crystals.

Organisation(s)

Dynamics of Condensed Systems

External organisation(s)

Martin-Luther-Universität Halle-Wittenberg

Journal

European Polymer Journal

Volume

64

Pages

138-146

No. of pages

9

ISSN

0014-3057

DOI

https://doi.org/10.1016/j.eurpolymj.2014.12.041

Publication date

03-2015

Peer reviewed

Yes

Austrian Fields of Science 2012

103015 Condensed matter

Keywords

ASJC Scopus subject areas

Physics and Astronomy(all), Materials Chemistry, Polymers and Plastics, Organic Chemistry

Portal url

https://ucrisportal.univie.ac.at/en/publications/crystallization-in-segregated-supramolecular-pseudoblock-copolymers(3175c248-34c5-4ec6-9216-911c006d2da6).html