Study on δ-Form Complex in a Syndiotactic Polystyrene/Organic Molecules System, 1. Preferential Complexing Behavior of Xylene Isomers

Sivakumar, Muthusamy; Yamamoto, Yusuke; Amutharani, Devaraj; Tsujita, Yoshiharu; Yoshimizu, Hiroaki; Kinoshita, Takatoshi

doi:10.1002/1521-3927(20020101)23:1<77::aid-marc77>3.0.co;2-2

Cited by 44 publications

(31 citation statements)

References 2 publications

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“…[9,10] A preferential uptake of p-xylene has also been reported in the clathrate formation using a m-and p-xylene mixed solvent system. [11] We think that another potential method for chemical separation is the utilization of the guest-exchange phenomenon of the d form. The replacement of the molecules confined in the cavities of the d form with a different kind of molecule was first observed in an X-ray study by Chatani et al; [12] this phenomenon was later confirmed by IR spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Selective Guest Uptake from Solvent Mixtures in the Clathrate Phase of Syndiotactic Polystyrene

Uda

Kaneko

Kawaguchi

2004

Macromol. Rapid Commun.

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Summary: Selective absorption uptake during the guest‐exchange processes in the δ form of syndiotactic polystyrene (sPS) was confirmed by IR spectroscopy. When films of the δ form were immersed in hexane/decane or chloroform/decane mixtures, decane molecules were incorporated preferentially in the δ form. Sorbate uptake by the δ form was greatly accelerated when the sorbate was mixed with a solvent penetrable to the amorphous region of sPS.Concentration changes in a δ‐form film during sorption processes: sorption of a chloroform(D)/decane(H) mixture (1:1 molar ratio).magnified imageConcentration changes in a δ‐form film during sorption processes: sorption of a chloroform(D)/decane(H) mixture (1:1 molar ratio).

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Section: Introductionmentioning

confidence: 99%

Selective Guest Uptake from Solvent Mixtures in the Clathrate Phase of Syndiotactic Polystyrene

Uda

Kaneko

Kawaguchi

2004

Macromol. Rapid Commun.

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“…Preferential complexing of p-xylene was clearly revealed in sPS membrane prepared from a mixture of the pand m-xylene isomers. [17][18][19] Sorption studies confirmed the preferential sorption by p-xylene. 18 These results indicate that the xylene isomers can be separated by sPS even though physical properties of the isomers are nearly identical.…”

mentioning

confidence: 62%

“…χ c δ were 70 and 65% for sPS/p-xylene and sPS/m-xylene systems, respectively, approximately agreeing with previous reports. 17,19 Figure 1 shows X-ray diffraction profiles of the sPS/p-xylene and sPS/m-xylene systems. There are mainly five diffraction peaks typical of the δ-form complex of sPS.…”

Section: Resultsmentioning

confidence: 99%

Study on δ-Form Complex in Syndiotactic Polystyrene-Organic Molecules System III. Fine Structures of Complexes with Xylene Isomers by Means of High-Resolution Solid-State 13C NMR Spectroscopy

Yamamoto

Kishi

Amutharani

et al. 2003

Polym J

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ABSTRACT:Syndiotactic polystyrene (sPS) is known to form a clathrate compound with p-xylene and m-xylene, called δ-form complex. In this study, the structures of the sPS/p-xylene and sPS/m-xylene systems were investigated by high-resolution solid-state 13 C nuclear magnetic resonance ( 13 C NMR) and X-ray diffraction. From the Miller indices of the (0,1,0) reflection, it was confirmed that the distance between sPS helical chains in the m-xylene system was longer than that of the p-xylene system. It was concluded that the location of one methyl group of m-xylene in the sPS δ-form complex coincided with that of one methyl group of p-xylene, because the 13 C NMR chemical shift and spin-lattice relaxation time of the methyl carbon of p-xylene were similar to those of one methyl carbon of m-xylene in the sPS δ-form complex. The meta substituted another methyl group of m-xylene showed a low-field chemical shift, indicating it close to the two phenyl groups of sPS chains in the δ-form complex.

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“…As an example, for the clathrates of the analogous syndiotactic polystyrene (s-PS), uses in the field of molecular sieves for the purification of water or gases [9][10][11][12][13] or as the sensing film for molecular sensors 14,15 have already been proposed. At variance with s-PS, whose clathrate structures are very similar to each other independently from guest molecules, those of s-PPMS are very sensitive to the shape and chemical structure of the guests.…”

Section: Introductionmentioning

confidence: 99%

A Clathrate Form of Syndiotactic Poly(p-methylstyrene) Containing Two Different Types of Cavities

et al. 2007

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The crystal structure of the clathrate form of syndiotactic poly(p-methylstyrene) containing benzyl chloride is presented. This structure presents a monoclinic unit cell (cell constants a ) 26.2 Å, b ) 11.8 Å, c ) 7.9 Å and γ ) 116°) in which the s(2/1)2 polymer helices and guest molecules are packed according the space group P2 1 /a. This molecular complex represents, to our knowledge, the first case of polymeric clathrate form in which in the same crystal are present two kinds of cavities having different shape and dimensions: R class cavities (containing two guest molecules) and class cavities (containing one guest molecule). The contemporaneous presence of these two types of cavities is originated by a disorder in the arrangement of right-and lefthanded helices in the crystals related to the particular staggered layout of the layers of chains containing the cavities in which helices of a given chirality can be randomly substituted by enantiomorphous ones.

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Study on δ-Form Complex in a Syndiotactic Polystyrene/Organic Molecules System, 1. Preferential Complexing Behavior of Xylene Isomers

Cited by 44 publications

References 2 publications

Selective Guest Uptake from Solvent Mixtures in the Clathrate Phase of Syndiotactic Polystyrene

Selective Guest Uptake from Solvent Mixtures in the Clathrate Phase of Syndiotactic Polystyrene

Study on δ-Form Complex in Syndiotactic Polystyrene-Organic Molecules System III. Fine Structures of Complexes with Xylene Isomers by Means of High-Resolution Solid-State 13C NMR Spectroscopy

A Clathrate Form of Syndiotactic Poly(p-methylstyrene) Containing Two Different Types of Cavities

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