Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 35: Activated and Glassy Dynamics of Soft Matter (joint session CPP/DY, organized by CPP)

CPP 35.8: Vortrag

Mittwoch, 9. März 2016, 11:45–12:00, H51

Chain-level dynamics and relaxation in supramolecular self-healing networks — Anton Mordvinkin and •Kay Saalwächter — Institut f. Physik-NMR, Martin-Luther-Univ. Halle-Wittenberg, Betty-Heimann-Str. 7, 06120 Halle, Germany

We elucidate the relationship between the local ”sticker lifetime” and the mechanical properties of different polyisobutylene (PIB) based supramolecular elastomers with self-healing capability [1,2]. The systems comprise linear PIB end-functionalized with hydrogen-bonding units [1] and randomly functionalized with ionic side groups [2]. In both cases, the supramolecular groups form clusters that correspond to high-functionality crosslinks, rendering the relationship between local bonding-debonding dynamics and the rheological behavior complex. We study the chain-level dynamics using an NMR-based molecular rheology approach [3]. Our results provide the microscopic underpinning of the rheological properties, and show the first direct evidence of ”sticky reptation” [4] in the randomly functionalized ionomer case.

[1] T. Yan et al., Macromolecules 47, 2122 (2014)

[2] A. Das et al., ACS Appl. Mater. Interf. 7, 20623 (2015)

[3] F. Vaca Chavez, K. Saalwachter, PRL 104, 198305 (2010)

[4] M. Rubinstein, A.N. Semenov, Macromolecules 34, 1058 (2001)