Effects of Neutral, Anionic and Cationic Polymer Brushes Grafted from Poly(para-phenylene vinylene) and Poly(para-phenylene ethynylene) on the Polymer’s Photoluminescent Properties

The conformation of a fluorescent polymer, in the solid state or in solution, plays a critical role in the polymer’s fluorescent properties. Thus, grafted side chains on a fluorescent polymer can directly influence its optical properties. In this study, the effect of grafted polymeric side chains on...

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Bibliographic Details
Published inPolymers Vol. 14; no. 14; p. 2767
Main Authors Kerr-Phillips, Thomas, Damavandi, Mona, Pilkington, Lisa I., Whitehead, Kathryn A., Travas-Sejdic, Jadranka, Barker, David
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 06.07.2022
MDPI
Subjects
Cationic polymerization
Copolymers
Emission analysis
Fluorescence
Graft copolymers
grafted polymers
Ligands
Molecular conformation
molecular engineering
Molecular weight
Optical properties
Photoluminescence
Physical properties
Polymerization
Polymers
Polyphenylene vinylene
Solvents
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Summary:The conformation of a fluorescent polymer, in the solid state or in solution, plays a critical role in the polymer’s fluorescent properties. Thus, grafted side chains on a fluorescent polymer can directly influence its optical properties. In this study, the effect of grafted polymeric side chains on the photoluminescent properties of poly(para-phenylene vinylene) (PPV) and poly(para-phenylene ethynylene) (PPE) were investigated. Low- and high-molecular-weight grafts of neutral poly(n-butyl acrylate), cationic poly(trimethylaminoethyl methacrylate) and anionic poly(sulfopropyl acrylate) were grafted onto PPVs and PPEs, and the effect of the grafting on the graft copolymer’s absorption and emission wavelengths, the fluorescence intensity and the quantum yield were studied. The results indicate that in the case of the ionic grafts, contrary to the expectations, the polymers have a reduced quantum yield. This contrasts with the copolymers with uncharged side chains (PnBA), where a major increase in the quantum yield is seen for the self-quenching conjugated pristine polymers. These results reinforce that the molecular conformation of the polymer in a solid or solution plays a critical role in fluorescent polymers photoluminescent properties.
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These authors contributed equally.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym14142767