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Volume 39, Issue 7
Displaying 1-12 of 12 articles from this issue
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MASAHARU AOKI, MASATOSHI SANO1983 Volume 39 Issue 7 Pages P219-P227
Published: July 10, 1983
Released on J-STAGE: November 28, 2008
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MASAOKI NOZAKI1983 Volume 39 Issue 7 Pages P228-P237
Published: July 10, 1983
Released on J-STAGE: November 28, 2008
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KENICHI KOYAMA1983 Volume 39 Issue 7 Pages P238-P244
Published: July 10, 1983
Released on J-STAGE: November 28, 2008
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HIROYUKI MIZUNO1983 Volume 39 Issue 7 Pages P245-P250
Published: July 10, 1983
Released on J-STAGE: November 28, 2008
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MASAO KATO1983 Volume 39 Issue 7 Pages P251-P260
Published: July 10, 1983
Released on J-STAGE: November 28, 2008
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Akira Takaku, Toshimasa Hashimoto, Yoshibumi Kato, Jiro Shimizu1983 Volume 39 Issue 7 Pages T273-T277
Published: July 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThermally stimulated current (TSC) spectra of polyacrylonitrile were measured for temperatures ranging from 10 to 170°C. The TSC spectrum obtained with the polarization in a low polarizing field is characterized by two peaks at 110°C (αI peak) and at 150°C (αII peak). In the case of the high field polarization, a current reversal phenomenum was observed near at the αII peak temperature. It is considered that the αI and αII peaks are due to the dipolar relaxations in the amorphous and paracrystalline phases, respectively. The activation energies for these two dipolar relaxations were determained by thermal sampling method. The values obtained were 36 kcal/mol for the αII relaxation and 43 kcal/mol for the αI relaxation. The degree of crystallinity, which was calculated as a percentage of the polarization charge responsible for the αII relaxation against the total polarization, was 32%.View full abstractDownload PDF (339K) -
Masuhiro Tsukada, Masanobu Nagura, Hiroshi Ishikawa1983 Volume 39 Issue 7 Pages T278-T282
Published: July 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSMolecular conformation and crystal structure of poly-O-benzyl-L-serine (POBLS) and poly-L-serine (PLS) as model compounds related to silk sericin were investigated by means of an infrared spectrometer, an x-ray diffractometer, a differential scanning calorimeter and a polarized scope. A cross β molecular conformation was found in both POBLS and PLS. Crystals were presumed to be made up by stacking of, β-sheets, which were formed by cross β molecular chains. Since the side chains were interposed by the sheets, hydrogen bonds were formed between the side chains or between the side chain and the main chain. A needle-like crystal was observed in POBLS. In contrast, a spherulite was found in PLS. However, the molecular alignment in both crystals was similar, i.e. polypeptide chains were folded perpendicular to the direction of crystal growth, while the side chains oriented paralled to it.View full abstractDownload PDF (1004K) -
Yoshitake Yamamoto, Osamu Sangen, Yoshinobu Kishimoto, Hidehiko Nakano1983 Volume 39 Issue 7 Pages T283-T290
Published: July 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSPoly[ethylene 4, 4′-(1, 2-ethanediyldioxy) bis (3-ethylbenzoate)] [o-Et type polyester-ether], which is the ethylene glycol polyester of 1, 2-bis(4-carboxy-2-ethylphenoxy) ethane having the ethyl substituents in the ortho-position on the benzene nuclei to the ester linkages, was successfully synthesized.
The crystallizability and the thermal properties of this polymer were investigated by use of X-ray analysis, infrared analysis, differential scanning calorimetry and estimation of the rate of crystallization.
It was shown that [o-Et] was crystalline and melt-spinnable. Its physical properties were as follows. Crystal melting temperature, 170°C; Glass transition temperature, 52°C; Half-time crystallization at 140°C, 5400 sec.; Fiber identity period, 18.7 Å.View full abstractDownload PDF (765K) -
Koukichi Yoshida, Nobuo Ogata, Teruaki Yanagawa, Noriyasu Yoshida1983 Volume 39 Issue 7 Pages T291-T298
Published: July 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSIn order to estimate the effect of yarn density of fabric on breaking behaviour, five kinds of the fabrics with different yarn densities were prepared. The warp and weft yarns of these fabrics were composed of 20 denier polyester mono-filaments. The fabric, into which a sharp notch had been introduced, was fractured under a dynamic loading condition. The fracture process was monitored using a load cell and a streak camera. Moreover, the effects of the sample extension rate and the initial crack length on the fracture were investigated. As a result, it is found that the breaking behaviour of the fabrics can be explained to some extent in terms of an energy-balance concept.View full abstractDownload PDF (1577K) -
Haruo Sanuki, Kazuhiko Ikeda, Hisashi Someya, Masaichi Onoyama1983 Volume 39 Issue 7 Pages T299-T306
Published: July 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSCerium (IV) ammonium nitrate (CAN)-initiated copolymerization of oligomeric vinyl phosphonate (OVP), Fyrol 76, with N-methylolacrylamide (NMA) on cotton fabrics at a low temperature (40°C) was studied, and the results were compared with those obtained by the pad-dry-cure method using persulfate catalyst. An oxygen index (OI) of the cotton fabrics treated by the former method was higher than that for the latter method, in case where these fabrics had the same phosphorus and nitrogen contents. From the relationship between the oxygen index and the phosphorus and nitrogen contents of the fabrics treated by the CAN-initiated copolymerization, it is said that the synergism of nitrogen in enhancing the flame-retarding effectiveness of phosphorus appears remark-ably at low phosphorus content. The cotton fabrics treated by the CAN-initiated copolymerization method had a tearing strength higher than those treated by the pad-dry-cure method in case where they had the same oxygen index value.View full abstractDownload PDF (460K) -
Masuhiro Tsukada, Izeki Uematsu, Kiyoshi Hirabayashi1983 Volume 39 Issue 7 Pages T307-T309
Published: July 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSConformational change of silk fibroin coagulated from the aqueous solution by the mechanical stirring was examined by means of infrared spectroscopy, circular dichroism and x-ray diffractometry. The silk fibroin obtained by flow-induced crystallization showed unoriented molecular form “silk II” structure, nevertheless of the applying of shears with various rates and time intervals. In contrast, the silk fibroin obtained by the casting from the supernatant solution and/or the residual silk fibroin in the solution exhibited β-structure, of which content increased with increasing shear rate.View full abstractDownload PDF (174K) -
Toshihiro Hirotsu1983 Volume 39 Issue 7 Pages T310-T312
Published: July 10, 1983
Released on J-STAGE: November 28, 2008
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