Crystallization in segregated supramolecular pseudoblock copolymers

Autor(en)

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

Abstrakt

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(en)

Dynamik Kondensierter Systeme

Externe Organisation(en)

Martin-Luther-Universität Halle-Wittenberg

Journal

European Polymer Journal

Band

64

Seiten

138-146

Anzahl der Seiten

9

ISSN

0014-3057

DOI

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

Publikationsdatum

03-2015

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie

Schlagwörter

ASJC Scopus Sachgebiete

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

Link zum Portal

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