Large-scale synthesis of arborescent polystyrenes

Abdul Munam, Mario Gauthier

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A method was developed for the large (100 g) scale synthesis of arborescent polystyrenes using acetyl coupling sites. Successive generations of dendritic graft polymers were obtained from cycles of polystyrene substrate acetylation with acetyl chloride and coupling in the presence of LiCl with "living" polystyryllithium chains capped with 2-vinylpyridine units. The grafting yield for the synthesis of a generation zero (GO or comb-branched) arborescent polystyrene under the conditions previously reported for the 10 g scale reactions decreased from 95 to 75% when scaled up to 100 g. The lowered yield was linked to side chain dimerization and deactivation of the macroanions. The modified 100 g scale procedure, using end-capping of the polystyryllithium with 1,1-diphenylethylene and the addition of 3-6 equivalents per living end of 2-vinylpyridine as a dilute solution, eliminated side chain dimerization and provided grafting yields of up to 95%. The large-scale procedure developed was applied to the synthesis of arborescent polystyrenes of generations up to G2 with low polydispersity indices (Mw/Mn ≤ 1.04) and molecular weights increasing in an approximately geometric fashion for each cycle.

Original languageEnglish
Pages (from-to)5742-5751
Number of pages10
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume46
Issue number17
DOIs
Publication statusPublished - Sep 1 2008

Fingerprint

Polystyrenes
Dimerization
Acetylation
Dendrimers
Graft copolymers
Polydispersity
Molecular weight
Substrates
2-vinylpyridine
polystyryllithium

Keywords

  • Anionic polymerization
  • Arborescent polymers
  • Branched
  • Dendrigraft polymers
  • Graft polymers
  • Polystyrene

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

Cite this

Large-scale synthesis of arborescent polystyrenes. / Munam, Abdul; Gauthier, Mario.

In: Journal of Polymer Science, Part A: Polymer Chemistry, Vol. 46, No. 17, 01.09.2008, p. 5742-5751.

Research output: Contribution to journalArticle

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