The presence of nanopores in mesophase of syndiotactic polystyrene estimated from gas sorption behaviour

Tsutsui, Kenji; Tsujita, Yoshiharu; Yoshimizu, Hiroaki; Kinoshita, Takatoshi

doi:10.1016/s0032-3861(97)10076-3

Cited by 36 publications

(41 citation statements)

References 51 publications

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“…17 The SPS films prepared by casting from PX solution consist of b form (crystalline complex between SPS and PX) and a mesophase can be formed by annealing the PX cast SPS films under appropriate conditions such films obtained by annealing the toluene cast films. 16 From these results, the concaveness of the sorption isotherm toward the activity axis at low activity might be due to the preferential sorption of PX into the mesophase containing many desorption sites of PX, which is a cast solvent ( Figure 10 there is a possibility that PX desorption sites in a mesophase can memorize size and shape of PX and the desorption sites act as effective sorption sites for PX molecules at low activity.…”

Section: Isomer Effect On Xylene Sorption Behaviors Of Sps Filmmentioning

confidence: 90%

“…We performed thermal and spectroscopic analyses of the SPS film which was prepared by casting toluene solution and then annealed at lower temperature than conformation transition temperature ( 190oC) in vacuum suggested that the films exhibited an ordered conformation but a lack of crystalline regularity in a previous paper. 16 This structure was defined as a mesophase. From C0 2 sorption measurement, it was apparent that the films contained many solvent desorption sites as nanopores in the mesophase (Figure 9).…”

Section: Isomer Effect On Xylene Sorption Behaviors Of Sps Filmmentioning

confidence: 99%

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The Isomer Effect on Complex Formation in Syndiotactic Polystyrene–Xylene System

Tsutsui

Katsumata

Fukatsu

et al. 1999

Polym J

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ABSTRACT:Thermal behaviors of syndiotactic polystyrene (SPS) gels in SPS-xylene isomer system were investigated to get information on the isomer effect of xylene on ability of complex formation with SPS. The melting temperature of the crystalline complex of p-xylene with SPS in SPS--p-xylene system was higher than that in SPS m-xylene system. The weight of the gel sample in each thermogravimetric curve decreased by two step in both systems. This might suggest that there were two spaces in which xylene molecules could be located. The weight of p-xylene in the second step decreased more largely and at higher temperature than that of m-xylenc. We could conclude that p-xylene exhibited higher ability of complex formation with SPS than m-xylene from thermal analyses. Infrared results on the process of gelation showed that the content of TTGG conformation was larger and the completion of gelation was faster in SPS p-xylene system. The difference of sorption behaviors at 25-C of the annealed atactic polystyrene film were not observed between xylene isomers, but the p-and m-xylene sorption isotherms of the annealed SPS film showed sigmoid-type isotherms and were diiTerent between xylene isomers. Sorption amount of p-xylene was larger than that of 111-xylene at low activity, but smaller at high activity, which resulted in the preferential sorption of p-xylene into a meso phase at low activity and the decrease of an amorphous part by complex formation of p-xylene with SPS at high activity.

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Section: Isomer Effect On Xylene Sorption Behaviors Of Sps Filmmentioning

confidence: 90%

Section: Isomer Effect On Xylene Sorption Behaviors Of Sps Filmmentioning

confidence: 99%

The Isomer Effect on Complex Formation in Syndiotactic Polystyrene–Xylene System

Tsutsui

Katsumata

Fukatsu

et al. 1999

Polym J

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“…To elucidate the thermal behavior of the unrelaxed volume in poly(2,6-dimethyl1,4-phenylene oxide), PPO, the Xe sorption isotherms of PPO were measured using a quartz crystal microbalance 24,25 across the temperature range of -55 1C to þ 80 1C.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of the mean size of polyphenyleneoxide microvoids, as studied by Xe sorption and 129Xe NMR chemical shift analyses

Yoshimizu

Ohta

Asano

et al. 2012

Polym J

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Both the Xe sorption isotherms and 129 Xe NMR spectra of poly(2,6-dimethyl-1,4-phenylene oxide), PPO, were obtained across a temperature range of -55 1C to þ 80 1C to investigate the temperature dependence of the gas sorption and the unrelaxed volume of PPO. All of the obtained sorption isotherms were analyzed based on the dual-mode sorption model, and the Langmuir saturation constant, C H 0 , which corresponds to the unrelaxed volume, was determined by curve fitting. The values of C H 0 increased linearly with decreasing temperature, and the obtained temperature was almost identical to the glass transition temperature, T g , of PPO when the C H 0 value was extrapolated to 0. The 129 Xe NMR chemical shift of 129 Xe in the PPO showed a nonlinear, low-field shift with increasing Xe pressure at temperatures below the T g . The mean volumes of individual microvoids were determined at each temperature based on the 129 Xe NMR chemical shift analysis, assuming a fast exchange of the Xe atoms between the Henry and Langmuir sorption sites. The temperature dependence of the individual microvoid volumes was similar to that of C H 0 .

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“…Of course the presence of several crystalline structures, which can be finely "tuned" according to the materials thermal history, makes PSsyn an even more attractive material from a strictly applications point of view. [9][10][11][12][13] However the low solubility of PSsyn in common solvents, as well as its high melting point, have in the past limited the possibility for this material to be blended with other polymeric materials in order to achieve commercial composite materials. In particular blending with styrene block copolymers such SBS or styrene-ethylene/1-butene-styrene (SEBS) seems to represent an attractive route to combine the PSsyn properties, with those of rubbery Full Paper: Blending of polystyrene-block-polybutadiene-block-polystyrene (SBS) triblock copolymers with syndiotactic polystyrene (PSsyn) has been performed in a Brabender mixer above the glass transition temperature of the triblock copolymer but below the melting point of PSsyn.…”

Section: Introductionmentioning

confidence: 99%

Blends of Syndiotactic Polystyrene with SBS Triblock Copolymers

Picchioni

Passaglia

Ruggeri³

et al. 2001

Macromol. Chem. Phys.

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Blending of polystyrene‐block‐polybutadiene‐block‐polystyrene (SBS) triblock copolymers with syndiotactic polystyrene (PSsyn) has been performed in a Brabender mixer above the glass transition temperature of the triblock copolymer but below the melting point of PSsyn. The presence of a large excess of amorphous SBS (at least 70 wt.‐%) as well as of the amorphous PSsyn phase (about 60 wt.‐%, also above its Tg) allowed the easy mixing of the components. In contrast, the presence of unmelted PSsyn crystallites affects both the final morphology of the blend as well as its dynamic behavior. Indeed, according to the dynamic thermomechanical analysis (DMTA) data it is possible to suggest that such solid particles act to reinforce the overall blend structure (as in composite materials filled with inorganic solid particles). Similar behavior is also observed for the SBS copolymer alone below the Tg of the styrene blocks, Tg (PS). This conclusion is supported by both the compatibility of the blends, and the thermal and dynamic thermomechanical behavior at T > Tg (PS) as investigated by means of Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM) and DMTA. The results obtained are tentatively compared with those of similar blends obtained from toluene solution.

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The presence of nanopores in mesophase of syndiotactic polystyrene estimated from gas sorption behaviour

Cited by 36 publications

References 51 publications

The Isomer Effect on Complex Formation in Syndiotactic Polystyrene–Xylene System

The Isomer Effect on Complex Formation in Syndiotactic Polystyrene–Xylene System

Temperature dependence of the mean size of polyphenyleneoxide microvoids, as studied by Xe sorption and 129Xe NMR chemical shift analyses

Blends of Syndiotactic Polystyrene with SBS Triblock Copolymers

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