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Volume 44, Issue 7
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[in Japanese]1971 Volume 44 Issue 7 Pages 553-560
Published: July 15, 1971
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSDownload PDF (1458K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1971 Volume 44 Issue 7 Pages 561-574
Published: July 15, 1971
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSDownload PDF (3383K) -
Part. IV. STMILARITY BETWEEN CHANGES OF HIGHER ORDER STRUCTURE OF FILLED RUBBER VULCANIZATES DUE TO THERMAL STIMULI AND THOSE OF THEM DUE TO MECHANICAL STIMULIK. Fujimoto, T. Nishi, M. Tanaka1971 Volume 44 Issue 7 Pages 590-605
Published: July 15, 1971
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSDirection of structural changes of carbon black filled natural rubber vulcanizates due to thermal aging which is conducted in a closed system and with less influence from oxygen diffusion from surface of the sample has been analyzed by sulfur analysis, NMR measurements, X-ray diffraction method, swelling experiments, mechanical characteristics, fracture characteristis and the morphology of the fracture surfaces for various carbon blacks which differ in their degree of reinforcement. On the other hand, the direction of the structural changes of filled rubber vulcanizates due to thermal aging has been compared with that of them due to mechanical stimuli.
It has been concluded that the unstable state of the chemical bonds and the physical (secondary) bonds in the filled rubber vulcanizates forming heterogeneous structures change to more stable state both due to thermal and mechanical stimuli and the degree of the change increases with the height of the heterogeneity of the system. It has also been proposed that the concept of the structural changes of the heterogeneous systems can be applied to either the process of mixing fillers and rubber and that of vulcanization and the structure of the filled rubber systems change always to be same direction.View full abstractDownload PDF (3445K) -
(Part 1) STUDIES ON CHANGES OF TENSILE STRENGTH AND FINE STRUCTURE OF NYLON 6 TIRE CORDS INDUCED BY STEAM-AND DRY-HEAT TREATMENTSSetsuo Fukuhara, Yasuo Suzuki, Shigeo Omote, Takasi Komatsubara1971 Volume 44 Issue 7 Pages 606-610
Published: July 15, 1971
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSNylon 6 tire cords and filaments were steam-and dry-heat treated under tension or tensionless state at temperatures ranging from 20°C to 230°C for 2 hours.
Tensile strength, intrinsic viscosity, specific gravity and X-ray wide angle diffraction were measured. The following results were obtained.
Steam-heat treatment under tension.
1. The tensile strength decreased markedly by treatments above about150°C.
2. Intrinsic viscosity decreased with increasing temperature.
3. The degree of crystallinity increased with the increase of treating temperature from20°C to 155°C, then decreased at higher temperatures than this.
The degree of crystallinity of the specimen melted at 162 °C showed the smallest value.
4. X-ray patterns of nylon 6 filaments were changed by the treatment. The degree of orientation indicated no changes with increasing temperature under tension, but markedly decreased under tensionless state.
Dry-heat treatment under tension.
1. The tensile strength decreased by treatments above about200°C.
2. The intrinsic viscosity decreased gradually with increasing temperature.
3. The degree of crystallinity increased with increasing temperature.
4. In the dry-heat treatment under tension or tensionless state, changes of X-ray patterns and degree of orientation were smaller than those in steam-heat treatment.
It was concluded from these results that the effects of steam-heat treatment on fine structure and tensile strength of nylon 6 tire cords were stronger than those of dry-heat treatment.View full abstractDownload PDF (1080K) -
Part II INVESTIGATION BY INFRARED ABSORPTION SPECTRA OF NYLON 6 TIRE CORDS INDUCED BY STEAM-AND DRY-HEAT TREATMENTSS. Fukuhara, Y. Suzuki, S. Omote, T. Komatsubara1971 Volume 44 Issue 7 Pages 611-615
Published: July 15, 1971
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSNylon 6 films were steam-heat (148°C, 158 °C, 2 hours) or dry-heat (180 °C, 200 °C, 210 °C, 2 hours) treated. Infrared absorption spectra of each film were investigated. Following results were obtained.
1. In the dry-heated films, absorption bands were recognized at 1753 and 1735 cm-1, which were based on the carbonyl group C=O that had been formed by air oxidation, while such absorption bands did not appear in the steam-heat treated films.
2. The absorption band at 1660 cm-1 which appeared conspicuously in the parallel polarized beam, was recognized in both steam-and dry-heat treated films.
The absorption band was considered to be derived from the C = C which was formed by main chain scission.
3. The 990 cm-1 absorption band (recognized by us at 970 cm-1) which had been named “Intermediate Structure” by Sandeman, remained even in a film dry-heated at 200 °C, but it completely disappearedin the films steam-heat treated at148°C or 158°C.
4. The intensities of the crystalline bands at 955 and 928 cm-1 increased by steam-or dry-heat treatment. These tendencies were in good agreement with the increase of specific gravity.View full abstractDownload PDF (830K) -
(Part III) INVESTIGATION BY WIDE AND SMALL ANGLE X-RAY DIFFRACTION ETC. OF NYLON 6 TIRE CORDS INDUCED BY STEAM-AND DRY-HEAT TREATMENTSS. Fukuhara, Y. Suzuki, S. Omote, T. Komatsubara1971 Volume 44 Issue 7 Pages 616-621
Published: July 15, 1971
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSNylon 6 tire cords or filaments were steam-heat treated under tension at 158°C for 1 12 hours.
Tensile strength, wide and small angle X-ray diffraction, melting point, intrinsic viscosity and specific gravity were measured. Following results were obtained.
1. Tensile strength of nylon 6 tire cords decreased with increasing steam-heat treatment time.
2. The size of crystallites obtained by X-ray wide angle diffraction markedly increased during 1 5 hours of the treatment, but indicated no further increases after 5 hours.
3. a : Long period obtained by X-ray small angle diffraction increased markedly during 1 5 hours of the treatment, then did gradually after 5 hours.
In the dry-heat treatment, the increase of long period was smaller than that in steam-heat treatment.
b : The melting point increased with increasing long period.
c : Electron density differences of nylon 6 filaments increased with increasing treating time.
4. Intrinsic viscosity decreased markedly during 1 3 hours of the treatment, then did gradually after 3 hours.
5. Specific gravity was markedly increased for 1 5 hours and decreased after 5 hours.
It was concluded from these results that the degradation of degree of polymerization and distinct change of fine structure of nylon 6 cause the decrease in tensile strength of nylon 6 tire cord.View full abstractDownload PDF (997K) -
1971 Volume 44 Issue 7 Pages 622-623
Published: July 15, 1971
Released on J-STAGE: October 16, 2009
JOURNAL RESTRICTED ACCESSDownload PDF (384K)
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