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

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

26 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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T1 - Syndiotactic poly(N-n-propylacrylamide) shows highly cooperative phase transition

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

Y1 - 2009/1/6

N2 - 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.

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

Abstract

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