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ATR FTIR Spectroscopic Study on Complexation of Sydiotactic Polystyrene with n‐Alkyl Carboxylic Acids
Author(s) -
Sato Shuma,
Kawaguchi Tatsuya,
Kaneko Fumitoshi
Publication year - 2016
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201600052
Subject(s) - cocrystal , alkyl , chemistry , polystyrene , molecule , polymer chemistry , solvent , tacticity , carboxylic acid , fourier transform infrared spectroscopy , chloroform , infrared spectroscopy , monomer , polymer , organic chemistry , chemical engineering , polymerization , hydrogen bond , engineering
Summary Syndiotactic polystyrene (sPS) forms the monoclinic δ clathrate cocrystal with n‐alkyl carboxylic acid (nCA). The sPS/nCA cocrystal is available not only by using the conventional guest exchange procedure but also by casting a chloroform (CHCl 3 ) solution containing two solutes (sPS and nCA). When nCAs with carbon number of 3 to 6 are introduced into the sPS cocrystal, an appreciable amount of monomers are generated. In order to clarify how the monomeric state of the nCAs are generated by the solution casting method, the structural changes during the formation of sPS/n‐hexanoic acid (nHA) cocrystal were followed by means of ATR FTIR spectroscopy. The conditions of the host sPS, the guest nHA and the solvent CHCl 3 were monitored, leading the following mechanism. The sPS/nHA cocrystallization was initiated with the conformational ordering of sPS chains; the (T 2 G 2 ) 2 helices appeared from the solution, which was accompanied with the formation of sPS cocrystal containing CHCl 3 molecules as guests. The initial guest CHCl 3 molecules were gradually substituted with nHA molecules, yielding the monomeric state of nHA in the cavies of the sPS cocrystal lattice.