A novel thermosensitive poly(methyl 2-acetamidoacrylate)

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

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The thermosensitive properties of aqueous poly(methyl 2-acetamidoacrylate) (PMAA) solutions were investigated in the absence or presence of sodium sulfate. Poly(methyl 2-acetamidoacrylate) with a molecular weight of 23,000 (PMAA-1) exhibited the cloud point. On heating the PMAA-1 solution, the transmittance began to decrease from near 34 °C and increased again after the minimum value was shown at 36.0 °C. The minimum transmittance increased linearly with an increasing concentration of the polymer although the minimum-transmittance temperature did not depend on polymer concentration. The minimum transmittance was affected by the pH and the 1-butanol added. This finding suggests that the cloudiness is controlled by a delicate balance of hydrophilicity and hydrophobicity and by intra- and/or inter-molecular hydrogen bonding. Poly(methyl 2-acetamidoacrylate) with a molecular weight of 15,000 (PMAA-2) did not exhibit cloudiness in distilled water. However, the addition of sodium sulfate caused cloudiness to appear. The cloud point of a PMAA-2 solution depended on concentrations of polymer and salt added. It decreased with an increase in polymer and salt concentrations. The salting-out constants were determined from the relationship between the cloud point and concentrations of polymer and salt.

Original languageEnglish
Pages (from-to)17-21
Number of pages5
JournalJournal of Polymer Research
Volume9
Issue number1
DOIs
Publication statusPublished - Mar 2002
Externally publishedYes

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Polymers
Sodium sulfate
Salts
Molecular weight
Hydrophilicity
Hydrophobicity
Butenes
1-Butanol
Hydrogen bonds
N-acetyldehydroalanine methyl ester
Heating
Water
Temperature
sodium sulfate

All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Polymers and Plastics

Cite this

Okamura, H., Maruyama, T., Masuda, S., Minagawa, K., Mori, T., & Tanaka, M. (2002). A novel thermosensitive poly(methyl 2-acetamidoacrylate). Journal of Polymer Research, 9(1), 17-21. https://doi.org/10.1023/A:1020623213658

A novel thermosensitive poly(methyl 2-acetamidoacrylate). / Okamura, Hirokazu; Maruyama, Tomomi; Masuda, Seizo; Minagawa, Keiji; Mori, Takeshi; Tanaka, Masami.

In: Journal of Polymer Research, Vol. 9, No. 1, 03.2002, p. 17-21.

Research output: Contribution to journalArticle

Okamura, H, Maruyama, T, Masuda, S, Minagawa, K, Mori, T & Tanaka, M 2002, 'A novel thermosensitive poly(methyl 2-acetamidoacrylate)', Journal of Polymer Research, vol. 9, no. 1, pp. 17-21. https://doi.org/10.1023/A:1020623213658
Okamura, Hirokazu ; Maruyama, Tomomi ; Masuda, Seizo ; Minagawa, Keiji ; Mori, Takeshi ; Tanaka, Masami. / A novel thermosensitive poly(methyl 2-acetamidoacrylate). In: Journal of Polymer Research. 2002 ; Vol. 9, No. 1. pp. 17-21.
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