Preparation and structural characteristics of stimuli-responsive hydrogel microsphere

Yoshiyuki Nakazawa, Yukiko Kamijo, Keiji Fujimoto, Haruma Kawaguchi, Yoshiaki Yuguchi, Hiroshi Urakawa, Kanji Kajiwara

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Monodisperse hydrogel microspheres were prepared by precipitation polymerization from acrylamide (AAm), methylenebisacrylamide (MBAAm) and methacrylic acid (MAc) in ethanol, and examined their stimuli response by changing pH or temperature. The microsphere was found to contract continuously by heating. The microsphere with a lower-content MBAAm exhibit more pronounced heat-contraction. Also at low pH the microsphere contracted due to the protonation of the carboxyl group in MAc. The internal structure was observed by small angle X-ray scattering (SAXS) and the stimuli-response mechanism was discussed from the view of network chain conformation.

Original languageEnglish
Pages (from-to)187-196
Number of pages10
JournalAngewandte Makromolekulare Chemie
Publication statusPublished - 1996 Aug

ASJC Scopus subject areas

  • Materials Science(all)


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