Photo-induced size control of amphiphilic alternating copoly(amide acid) aggregates

Takashi Hamada, Seiji Sakamoto, Kazuaki Kudo

Research output: Contribution to conferencePaperpeer-review


We prepared amphiphilic alternating copoly(amide acid) (PAA) from rel[1R,5S,6R]-3-oxabicyclo[3.2.1]octane-2,4-dione-6-spiro-3'-(tetrahydrofuran- 2',5'-dione) (DAn), 2,4-diaminobenzenesulfonic acid, and o-nitrobenzyl 3,5-diaminobenzoate based on unique regioselectivity in the ring opening reaction of DAn. PAA directly dissolved in neutral water and serf-assembled to form polymer aggregates. The association behavior of PAA was investigated by photophysical study using fluorescent probe, transmission electron microscopy, and dynamic light scattering (DLS) measurements. Upon photoirradiation, a change in UV spectrum, which is attributed to photodecomposition of side chain, was observed. DLS measurements of the resulting solution indicated that the diameter of aggregates changed from 55 to 27 nm.

Original languageEnglish
Number of pages1
Publication statusPublished - 2006 Oct 18
Event55th SPSJ Annual Meeting - Nagoya, Japan
Duration: 2006 May 242006 May 26


Other55th SPSJ Annual Meeting


  • 2-nitrobenzyl ester
  • Aggregates
  • Amphiphilic alternating copoly(amide acid)
  • Photoresponse

ASJC Scopus subject areas

  • Engineering(all)


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