Conformation of ionizable poly Para phenylene ethynylene in dilute solutions

Wijesinghe, Sidath; Maskey, Sabina; Perahia, Dvora; Grest, Gary S.

doi:10.1002/polb.23949

Title: Conformation of ionizable poly Para phenylene ethynylene in dilute solutions

Journal Article · Tue Nov 03 00:00:00 EST 2015 · Journal of Polymer Science. Part B, Polymer Physics

DOI:https://doi.org/10.1002/polb.23949· OSTI ID:1238585

Wijesinghe, Sidath ^[1]; Maskey, Sabina ^[1]; Perahia, Dvora ^[1]; Grest, Gary S. ^[2]

Clemson Univ., Clemson, SC (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

The conformation of dinonyl poly para phenylene ethynylenes (PPEs) with carboxylate side chains, equilibrated in solvents of different quality is studied using molecular dynamics simulations. PPEs are of interest because of their tunable electro-optical properties, chemical diversity, and functionality which are essential in wide range of applications. The polymer conformation determines the conjugation length and their assembly mode and affects electro-optical properties which are critical in their current and potential uses. The current study investigates the effect of carboxylate fraction on PPEs side chains on the conformation of chains in the dilute limit, in solvents of different quality. The dinonyl PPE chains are modeled atomistically, where the solvents are modeled both implicitly and explicitly. Dinonyl PPEs maintained a stretched out conformation up to a carboxylate fraction f of 0.7 in all solvents studied. The nonyl side chains are extended and oriented away from the PPE backbone in toluene and in implicit good solvent whereas in water and implicit poor solvent, the nonyl side chains are collapsed towards the PPE backbone. Thus, rotation around the aromatic ring is fast and no long range correlations are seen within the backbone.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1238585

Report Number(s):: SAND-2015-7703J; 603941; TRN: US1600396

Journal Information:: Journal of Polymer Science. Part B, Polymer Physics, Vol. 54, Issue 5; ISSN 0887-6266

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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