title: Diphenylphosphino Styrene-Containing Homopolymers: Influence of Alkylation and Mobile Anions on Physical Properties.
abstract: Conventional free radical polymerization and post-alkylation of 4-diphenylphosphino styrene (DPPS) generate a new class of high-molecular-weight phosphonium-containing homopolymers with tunable thermal, viscoelastic, and wetting properties. Post-alkylation and subsequent anion exchange provide an effective method for tuning Tg values and thermal stability as a function of alkyl chain length and counteranion selection (X(-) , BF4 (-) , TfO(-) , and Tf2 N(-) ). Rheological characterization facilitates the generation of time-temperature-superposition (TTS) pseudomaster curves and subsequent analysis of frequency sweeps at various temperatures reveals two relaxation modes corresponding to long-range segmental motion and the onset of viscous flow. Contact angle measurements reveal the influence of counteranion selection on wetting properties, revealing increased contact angles for homopolymers containing nucleophilic counteranions. These investigations provide fundamental insight into phosphonium-containing polymers, aiming to guide future research and applications involving electro-active polymeric devices.
authors.affiliation: Macromolecules and Interfaces Institute (MII), Department of Chemistry, Virginia Tech, Blacksburg, VA, 24061-0212, USA.
authors.forename: Chainika
authors.initials: C
authors.lastname: Jangu
authors.affiliation: Macromolecules and Interfaces Institute (MII), Department of Chemistry, Virginia Tech, Blacksburg, VA, 24061-0212, USA.
authors.forename: Alison R
authors.initials: AR
authors.lastname: Schultz
authors.affiliation: Macromolecules and Interfaces Institute (MII), Department of Chemistry, Virginia Tech, Blacksburg, VA, 24061-0212, USA.
authors.forename: Candace E
authors.initials: CE
authors.lastname: Wall
authors.affiliation: Macromolecules and Interfaces Institute (MII), Department of Chemistry, Virginia Tech, Blacksburg, VA, 24061-0212, USA.
authors.forename: Alan R
authors.initials: AR
authors.lastname: Esker
authors.affiliation: Macromolecules and Interfaces Institute (MII), Department of Chemistry, Virginia Tech, Blacksburg, VA, 24061-0212, USA.
authors.forename: Timothy E
authors.initials: TE
authors.lastname: Long
mesh_terms: D000478:Alkylation; D000838:Anions / Q000737:chemistry; D002627:Chemistry, Physical; D005609:Free Radicals / Q000737:chemistry; D015394:Molecular Structure; D058105:Polymerization; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D013343:Styrenes / Q000138:chemical synthesis / Q000737:chemistry*; D013696:Temperature
chemical_list: C000617019:4-diphenylphosphino styrene; D000838:Anions; D005609:Free Radicals; D011108:Polymers; D013343:Styrenes
keywords: anion exchange; phosphonium; radical polymerization; thermogravimetric analysis; viscoelastic properties