Novel Nanoscopic Architectures. Linear-Globular ABA Copolymers with Polyether Dendrimers as A Blocks and Polystyrene as B Block

Ivan Gitsov, Jean M.J. Fréchet*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

97 Scopus citations

Abstract

The synthesis of novel linear-dendritic triblock copolymers was achieved via anionic polymerization of styrene (St) initiated by potassium naphthylide, subsequent modification of the “living” poly-St with 1,1-diphenylethylene, and final quenching with reactive dendrimers. The effectiveness of the coupling was high as confirmed by size-exclusion chromatography (SEC) with photodiode array detection. The ABA block copolymers were characterized by SEC with coupled viscometry and multiangle laser light scattering, NMR, and thermal analysis. It was found that, in solution, these hybrid materials have radii of gyration between 2.5 and 15 nm. They undergo a shape transition from an extended globular form to a statistical coil as the molecular weight of their linear (poly-St) block increases. All ABA copolymers seem to experience substantial entanglements in the solid state, but they have a single Tg with values ranging from 313 to 367 K, indicating that the linear and dendritic blocks are miscible on the molecular level unlike physical mixtures of their two individual components.

Original languageEnglish (US)
Pages (from-to)7309-7315
Number of pages7
JournalMacromolecules
Volume27
Issue number25
DOIs
StatePublished - Dec 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Novel Nanoscopic Architectures. Linear-Globular ABA Copolymers with Polyether Dendrimers as A Blocks and Polystyrene as B Block'. Together they form a unique fingerprint.

Cite this