Journal Article

FZJ-2017-07364

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Melt dynamics of supramolecular comb polymers: Viscoelastic and dielectric response

Staropoli, M. (Corresponding author)FZJ* ; Raba, A.FZJ* ; Hövelmann, C. H. ; Appavou, M.-S.FZJ* ; Allgaier, J. ; Krutyeva, M.FZJ* ; Pyckhout-Hintzen, W.FZJ* ; Wischnewski, A.FZJ* ; Richter, D.FZJ*

2017
Inst. Melville, NY [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/18115  doi:10.1122/1.5001059

Abstract: The structure and the dynamics of supramolecular comblike polymers in the melt state is studied by a combination of linear rheology, dielectric spectroscopy, and small angle neutron scattering. The system consists of blends of 1,2-polybutyleneoxide (PBO) entangled backbones, randomly functionalized with thymine (thy) and barely entangled PBO graft chains—modified with 2,4-diamino-1,3,5-triazine (DAT) end groups. These bioinspired groups associate into a transiently branched comb architecture through heterocomplementary interaction involving the two different hydrogen bonding groups thy and DAT. In the present manuscript, we focus on the comparison of the macroscopic dynamics of the associating blends and permanent comb analogs. The viscoelastic and dielectric response of covalent and reversible combs are found to be comparable. The viscoelastic response of mixtures of thy-functionalized entangled backbones and DAT-end-modified barely entangled chains show a relaxation mechanism, which is mostly attributed to the association/breakage dynamics of the transient bonds with characteristic time ∼1 s  at T=−25 °C. In the parallel dielectric investigation, the reversible branched structure is still evident from the comparison with the corresponding permanent combs and allows the distinction between fixed arms relaxation and the lifetime. A α∗  process of the thy-thy association is likewise detected. The time scale of the supramolecular association makes the thy-DAT pair an ideal candidate for the development of responsive materials that combine permanent and transient linkages for novel applications and self-healing properties

Keyword(s): Polymers, Soft Nano Particles and Proteins (1st) ; Soft Condensed Matter (2nd) ; Chemistry (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
2. Neutronenstreuung (Neutronenstreuung ; JCNS-1)
3. Streumethoden (JCNS-2)
4. Neutronenstreuung (ICS-1)

Research Program(s):

1. 531 - Condensed Matter and Molecular Building Blocks (POF3-531) (POF3-531)
2. 551 - Functional Macromolecules and Complexes (POF3-551) (POF3-551)

Experiment(s):

1. KWS-2: Small angle scattering diffractometer (NL3ao)

Appears in the scientific report 2017

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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