Morphology orientation of comb-like polymers with rigid backbones under the influence of shear fields

Gaurav Gupta; Varun Danke; Tamoor Babur; Mario Beiner; Gaurav Gupta; Varun Danke; Tamoor Babur; Mario Beiner

doi:10.3934/matersci.2017.4.970

AIMS Materials Science

2017, Volume 4, Issue 4: 970-981. doi: 10.3934/matersci.2017.4.970

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Morphology orientation of comb-like polymers with rigid backbones under the influence of shear fields

1.
Fraunhofer Institut für Mikrostruktur von Werkstoffen und Systemen IMWS, Walter-Hülse-Straße 1, D-06120 Halle (Saale), Germany
2.
Naturwissenschaftliche Fakultät II, Martin-Luther-Universität Halle-Wittenberg, Heinrich-Damerow-Str. 4, D-06120 Halle (Saale), Germany

Received: 30 June 2017 Accepted: 24 August 2017 Published: 31 August 2017

The influence of shear fields on the packing behavior and morphology orientation are studied for two comb-like polymers viz. poly(1,4-phenylene-2,5-didecyloxy terephthalate) (PPDOT) and poly(2,5-didecyloxy-1,4-phenylenevinylene) (DOPPV) with different rigid backbones having C = 10 alkyl carbons per side chain. Crystallographic analysis based on X-ray diffractometry measurements shows that both PPDOT and DOPPV exhibit a long-range ordered layered structure with alternating main chains and alkyl nanodomains and can be characterized by an orthorhombic and monoclinic unit cell respectively. No measurable influence of processing on the unit cell of the individual polymers is observed comparing diffraction data on isotropic (powder) samples and extruded fibers. The main difference between the PPDOT and DOPPV is in the molecular orientation of the backbones in shear aligned fibers as observed from the 2D diffraction patterns. While, for PPDOT the polymer backbones align along the direction of extrusion (fiber axis), for DOPPV the backbones align perpendicular to the extrusion direction. A possible relation between differences in backbone orientation under influence of shear fields for DOPPV and PPDOT and differences in the packing state of the side chains, which are in a crystalline state for DOPPV but in a disordered state for PPDOT, is considered.
- X-ray scattering,
- crystal structure,
- oriented fibers,
- side chain packing,
- alkyl nanodomains
Citation: Gaurav Gupta, Varun Danke, Tamoor Babur, Mario Beiner. Morphology orientation of comb-like polymers with rigid backbones under the influence of shear fields[J]. AIMS Materials Science, 2017, 4(4): 970-981. doi: 10.3934/matersci.2017.4.970

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Abstract

The influence of shear fields on the packing behavior and morphology orientation are studied for two comb-like polymers viz. poly(1,4-phenylene-2,5-didecyloxy terephthalate) (PPDOT) and poly(2,5-didecyloxy-1,4-phenylenevinylene) (DOPPV) with different rigid backbones having C = 10 alkyl carbons per side chain. Crystallographic analysis based on X-ray diffractometry measurements shows that both PPDOT and DOPPV exhibit a long-range ordered layered structure with alternating main chains and alkyl nanodomains and can be characterized by an orthorhombic and monoclinic unit cell respectively. No measurable influence of processing on the unit cell of the individual polymers is observed comparing diffraction data on isotropic (powder) samples and extruded fibers. The main difference between the PPDOT and DOPPV is in the molecular orientation of the backbones in shear aligned fibers as observed from the 2D diffraction patterns. While, for PPDOT the polymer backbones align along the direction of extrusion (fiber axis), for DOPPV the backbones align perpendicular to the extrusion direction. A possible relation between differences in backbone orientation under influence of shear fields for DOPPV and PPDOT and differences in the packing state of the side chains, which are in a crystalline state for DOPPV but in a disordered state for PPDOT, is considered.

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