Self-Assembly and aggregation of ATRP prepared amphiphilic BAB tri-block copolymers contained nonionic ethylene glycol and fluorescent 9,10-di(1-naphthalenyl)-2-vinyl-Anthracene/1-vinyl-pyrene segments

Jianli Wang*, Louis M L LEUNG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Two novel amphiphilic BAB-type block copolymers, ADN-PEG3400-ADN and Py-PEG3400-Py containing deep blue and bluish-green fluorescent moieties were prepared using atom transfer radical polymerization (ATRP) (where, ADN = poly(9,10-di(1-naphthalenyl)-2-vinylanthracene), Py = poly(1-vinyl pyrene) and PEG3400 = poly(ethylene glycol) with Mn = 3400 g/mol). The GPC number averaged molecular weights (MW) of the block copolymers were Mn = 9600 and 13,800 g/mol, respectively, based on polystyrene MW standards. The PEG3400 segment has a melting temperature (Tm peak) at 64-65 C, whereas the glass transition temperatures (Tg midpoint) of the ADN and Py segments were found to be 230 C and 193 C, respectively, and are similar to their respective homopolymers indicating complete microphase segregration. The photoluminescence (PL) emission of the copolymers ADN-PEG3400-ADN exhibited two maxima at 423.5 nm and 441.5 nm while Py-PEG3400-Py has a maximum at 488.5 nm. Both copolymers form individual spherical micelles with diameter from 30 to 90 nm for Py-PEG3400-Py and 40-160 nm for ADN-PEG3400-ADN. The micelles, however, transform into cross-linked pearl-necklace-like aggregates at polymer concentrations above 1000 ppm, which may be attributed to the physical cross-linking between adjacent spherical micelles caused by the PEG3400 segments.

Original languageEnglish
Pages (from-to)3722-3733
Number of pages12
JournalEuropean Polymer Journal
Volume49
Issue number11
DOIs
Publication statusPublished - Nov 2013

Scopus Subject Areas

  • Physics and Astronomy(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

User-Defined Keywords

  • 1-Vinyl-pyrene
  • 9,10-Di(1-naphthalenyl)-2-vinyl- Anthracene
  • Amphiphilic
  • ATRP
  • BAB
  • Block copolymer

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