Structure and properties of the δ‐form and mesophase of syndiotactic polystyrene membranes prepared from different organic solvents

Abstract

Syndiotactic polystyrene (sPS) membranes were prepared with different organic solvent systems and compared to get the information about the -form complexing behavior of sPS. Further, the guest molecules included in the clathrate form of sPS are removed by stepwise extraction method. The conformational changes during the TTGG helical formation of sPS/organic solvent systems have been identified by FTIR spectroscopy, and it was concluded that the TTGG helices were constructed in regular sequences, which depends on the nature of the respective solvents. The TTGG content in the mesophase is found to be increased by removing the guest molecules. The structural changes of sPS/organic solvent systems have been characterized by WAXD analysis. Moreover, the different clathrate structures were found and showed the different crystalline reflections in the WAXD profiles, which are significantly changed with the kind of guest solvent included in sPS. The content of solvents in the clathrated sPS and the desorption temperatures were determined by thermal analysis. The resulted mesophase of sPS membrane contains the nanoporous molecular cavities that depend on the size of the guest molecule. V V C 2005 Wiley Periodicals, Inc.

Characterization of toluene and 2-methylnaphthalene transport separated by syndiotactic polystyrene having various crystalline forms

“…20,21 The pore size has been reported to be 115 Å´3. 21 The sorption and desorption of organic solvents in the nanopores of d e -sPS were reported by Guerra and colleagues, 22,23 Tsujita and colleagues [24][25][26][27] and our group. 28,29 This porous structure is very attractive not only from an academic but also from a practical view, because it is applicable as a sensor for detecting small amounts of organic solvents, adsorption of chemical compounds and so on.…”

Sulfonated syndiotactic polystyrene: sorption of ionic liquid in the amorphous phase and of organic guests in the crystalline phase

“…Presently, polymeric nanoporous crystalline phases have been described for s‐PS and poly(2,6‐dimethyl‐1,4‐phenylene oxide) …”

“…In particular, for s‐PS, two nanoporous crystalline phases (δ and ε) have been discovered, which can absorb several guest molecules producing clathrate and intercalate co‐crystals. Films presenting s‐PS/active‐guest co‐crystals have been proposed as advanced materials for optical, magnetic, and ferroelectric applications.…”

“…Presently, polymeric nanoporous crystalline phases have been described for s-PS [10][11][12][13][14][15][16][17][18] and poly(2,6-dimethyl-1,4-phenylene oxide). [19] In particular, for s-PS, two nanoporous crystalline phases (d [10][11][12][13] and e [14][15][16][17][18] ) have been discovered, which can absorb several guest molecules producing clathrate [20][21][22][23] and intercalate [24][25][26][27][28] co-crystals. Films presenting s-PS/active-guest co-crystals have been proposed as advanced materials for optical, [29][30][31][32][33][34] magnetic, [35,36] and ferroelectric [37,38] applications.…”

Absorption Kinetics of Phenol into Different Size Nanopores Present in Syndiotactic Polystyrene and Poly (p-methylstyrene)

“…[35,36] The absorption rate of solvent molecules was enhanced by a porous aerogel with a mesh structure, which was prepared by treating the sPS gel in scCO2. [37][38][39] The relationship between the size of the solvent molecule and the cavity volume of e-sPS was reported by Tsujita et al [40][41][42][43] It was shown that the cavity volume of -sPS is reduced after extracting the solvent molecules.…”