Thermosensitive properties of a novel poly(methyl 2-acetamidoacrylate-co-methyl acrylate)

Hirokazu Okamura, Seizo Masuda, Keiji Minagawa, Takeshi Mori, Masami Tanaka

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Copolymerizations of methyl 2-acetamidoacrylate (MAA) with methyl acrylate (MA) were carried out at 60 °C in chloroform. MAA-rich copolymers are soluble in water and MAA-poor copolymers insoluble. Among water-soluble copolymers obtained, only one (HP-77) which contains 77% of MAA units was thermosensitive. Thermal properties of HP-77 were investigated in the presence or absence of inorganic salts. The cloud point of aqueous HP-77 solution depended on polymer concentration: The cloud point decreased exponentially with an increasing concentration of the polymer. The cloud point of HP-77 was also affected significantly by the type and concentration of salts. The effectiveness of salts to reduce the cloud point is NaBr≈KBr<NaCl≈KCl<Na2SO4. The salting-out coefficients were evaluated as 2.45 l/mol for sodium chloride and 14.56 l/mol for sodium sulfate, respectively, from the relationship (Setschenow's equation) between logarithm of the solubility of HP-77 and salt concentration. The salting-out coefficient of sodium sulfate is larger than that of sodium chloride.

Original languageEnglish
Pages (from-to)639-644
Number of pages6
JournalEuropean Polymer Journal
Issue number4
Publication statusPublished - Apr 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Polymers and Plastics
  • General Physics and Astronomy
  • Organic Chemistry


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