Syndiotactic poly(N-n-propylacrylamide) shows highly cooperative phase transition

Takeshi Mori; Tomohiro Hirano; Atsushi Maruyama; Yoshiki Katayama; Takuro Niidome; Yoichi Bando; Koichi Ute; Shinji Takaku; Yasushi Maeda

doi:10.1021/la8034837

Syndiotactic poly(N-n-propylacrylamide) shows highly cooperative phase transition

Takeshi Mori, Tomohiro Hirano, Atsushi Maruyama, Yoshiki Katayama, Takuro Niidome, Yoichi Bando, Koichi Ute, Shinji Takaku, Yasushi Maeda

Materials Science and Engineering, School of Engineering

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

Syndiotactic poly(N-n-propylacrylamide)s (PNNPAM) with various racemo (r) diad contents were synthesized, and their phase transition behaviors were studied by high-sensitivity differential scanning calorimetry and FT-IR spectroscopy. The cooperativity of the phase transition increased with the increase in the r diad content. Compared with the atactic PNNPAM, the number of cooperative units, which shows the monomeric units length undergoing cooperative phase transition, increased 2.5- to 4-fold in the syndiotactic polymers. From the results of FT-IR spectroscopy and quantum chemical calculations, it was determined that the high cooperativity of the syndiotactic polymers resulted from local formation of an ordered structure in a dehydrated state.

Original language	English
Pages (from-to)	48-50
Number of pages	3
Journal	Langmuir
Volume	25
Issue number	1
DOIs	https://doi.org/10.1021/la8034837
Publication status	Published - Jan 6 2009

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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10.1021/la8034837

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title = "Syndiotactic poly(N-n-propylacrylamide) shows highly cooperative phase transition",

abstract = "Syndiotactic poly(N-n-propylacrylamide)s (PNNPAM) with various racemo (r) diad contents were synthesized, and their phase transition behaviors were studied by high-sensitivity differential scanning calorimetry and FT-IR spectroscopy. The cooperativity of the phase transition increased with the increase in the r diad content. Compared with the atactic PNNPAM, the number of cooperative units, which shows the monomeric units length undergoing cooperative phase transition, increased 2.5- to 4-fold in the syndiotactic polymers. From the results of FT-IR spectroscopy and quantum chemical calculations, it was determined that the high cooperativity of the syndiotactic polymers resulted from local formation of an ordered structure in a dehydrated state.",

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AU - Mori, Takeshi

AU - Hirano, Tomohiro

AU - Maruyama, Atsushi

AU - Katayama, Yoshiki

AU - Niidome, Takuro

AU - Bando, Yoichi

AU - Ute, Koichi

AU - Takaku, Shinji

AU - Maeda, Yasushi

PY - 2009/1/6

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AB - Syndiotactic poly(N-n-propylacrylamide)s (PNNPAM) with various racemo (r) diad contents were synthesized, and their phase transition behaviors were studied by high-sensitivity differential scanning calorimetry and FT-IR spectroscopy. The cooperativity of the phase transition increased with the increase in the r diad content. Compared with the atactic PNNPAM, the number of cooperative units, which shows the monomeric units length undergoing cooperative phase transition, increased 2.5- to 4-fold in the syndiotactic polymers. From the results of FT-IR spectroscopy and quantum chemical calculations, it was determined that the high cooperativity of the syndiotactic polymers resulted from local formation of an ordered structure in a dehydrated state.

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