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 journalArticle

16 Citations (Scopus)

Abstract

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
Volume38
Issue number4
DOIs
Publication statusPublished - Apr 1 2002
Externally publishedYes

Fingerprint

acrylates
Salts
salts
copolymers
Sodium sulfate
Copolymers
sodium chlorides
Sodium chloride
sodium sulfates
Sodium Chloride
Polymers
Water
polymers
copolymerization
coefficients
Chloroform
Chlorine compounds
chloroform
logarithms
Copolymerization

All Science Journal Classification (ASJC) codes

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

Cite this

Thermosensitive properties of a novel poly(methyl 2-acetamidoacrylate-co-methyl acrylate). / Okamura, Hirokazu; Masuda, Seizo; Minagawa, Keiji; Mori, Takeshi; Tanaka, Masami.

In: European Polymer Journal, Vol. 38, No. 4, 01.04.2002, p. 639-644.

Research output: Contribution to journalArticle

Okamura, Hirokazu ; Masuda, Seizo ; Minagawa, Keiji ; Mori, Takeshi ; Tanaka, Masami. / Thermosensitive properties of a novel poly(methyl 2-acetamidoacrylate-co-methyl acrylate). In: European Polymer Journal. 2002 ; Vol. 38, No. 4. pp. 639-644.
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