All issues
Predecessor
Volume 62, Issue 2
Displaying 1-9 of 9 articles from this issue
- |<
- <
- 1
- >
- >|
-
[in Japanese]1989 Volume 62 Issue 2 Pages 65-73
Published: 1989
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDownload PDF (711K) -
[in Japanese]1989 Volume 62 Issue 2 Pages 74-83
Published: 1989
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDownload PDF (716K) -
[in Japanese], [in Japanese]1989 Volume 62 Issue 2 Pages 84-86
Published: 1989
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDownload PDF (241K) -
G VALUES OF CROSS-LINKING AND SCISSION OF ELASTOMER OBTAINED BY CHEMICAL STRESS RELAXATIONMasayuki ITO1989 Volume 62 Issue 2 Pages 87-92
Published: 1989
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSThis paper proposes a new method to evaluate the G values of cross-linking (Gc) and scission (Gs) by the measurement of chemical stress relaxation. Continuous and intermittent chemical stress decay of tetrafluoroethylene-propylene elastomer was measured at 100°C under the irradiation of Co-60 γ ray. Gc was found to be 0.88 and Gs was 1.89 by this method.
On the other hand Gc and Gs of the polymer obtained by Charlesby-Pinner plot was 1.22 and 2.54, respectively. Chemical stress relaxation was also measured in nitrogen atmosphere at room temperature. In this condition, Gc and Gs was found to be 1.58 and 0.24, respectively. Gc and Gs obtained by Charlesby-Pinner plot at the same circumstance are 1.11 and 0.22 respectively.View full abstractDownload PDF (400K) -
1989 Volume 62 Issue 2 Pages 92
Published: 1989
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDownload PDF (47K) -
THE EFFECT OF IONIZING RADIATION ON MOONEY-RIVLIN PLOT OF ELASTOMERMasayuki ITO1989 Volume 62 Issue 2 Pages 93-97
Published: 1989
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSThe changes of C1 and C2 of Mooney-Rivlin plot of elastomer by irradiation was studied.
The sample used is tetrafluoroethylene-propylene copolymer. Scission reaction of the polymer chain is predominant when the diffusion of oxygen is sufficient enough during irradiation. On the other hand, irradiation without oxygen in the polymer increases the crosslinking density.
The result for three cases are as follows:
(1) Values of C1 increase and that of C2 decrease with increasing dose when the cross-linking density of the elastomer increase by irradiation.
(2) Both C1 and C2 decreases with increasing dose when the irradiation causes a decrease in cross-linking density of the polymer.
(3) The third case, where the cross-linking density was maintained the constant by the alternative irradiation of γ ray (60kGy) and electron beam (40kGy).
The operation (alternating irradiation) causes the same amount of scission and cross-linking in the polymer.
C1 increases slightly with increasing the times of operation and C2 decreases with increasing the times of that.
The result suggests that C2 decreases with decreasing the effective long network chain by irradiation.View full abstractDownload PDF (338K) -
STUDIES ON DEPENDENCE OF PHASE TRANSITION AND PHYSICAL PROPERTIES ON PARTICLES CONCENTRATIONKunihiko FUJIMOTO, Hiroyuki TAKAHARA, Naoto MIFUNE1989 Volume 62 Issue 2 Pages 98-106
Published: 1989
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSWe examined the dependence on particles concentration of such physical properties of carbon black filled SBR as specific gravity, swollen network density, static modulus, dynamic modulus, thermodynamic properties of modulus, loss factor, maximal loss factor, temperature at maximal loss factor, spin-spin relaxation time of A and C phases, volume fraction of C phase. There are strong couplings between particle surfaces and rubber molecular chains in this SBR.
We obtained the following results:
(1) Dependence curves of physical properties on particles concentration have two points of inflection; the first one is caused by phase transition, the other one is caused by transition from mixed state of entropic and energetic to only to onlyd energetic state. (2) Dependence curves of physicald properties on particles concentration are classified into three types; (a) linear function (b) quadric function and (c) logarithmic function of particles concentration.View full abstractDownload PDF (605K) -
Asahiro AHAGON1989 Volume 62 Issue 2 Pages 107-114
Published: 1989
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSA method to evaluate crosslinking and chain scission is discussed using the extension ratio at break λb and 100% modulus M100 of a black-filled rubber before and after air-aging.
It is assumed tha λb of black-filled rubbers at 25°C is determined by the network chain length n through a power law relation. Since n is governed by crosslinking, the assumption leads to a method to evaluate crosslinking using change of λb due to aging. The observed crosslinking, expressed in terms of M100, is often lower than the evaluated one due to chain scission, which accounts for the difference. Based on this idea, the aging test results were examined in terms of crosslinking and chain scission. The method provided a rational explanation for the observed change of the tensile properties due to aging.View full abstractDownload PDF (624K) -
1989 Volume 62 Issue 2 Pages 115-116
Published: 1989
Released on J-STAGE: April 16, 2008
JOURNAL RESTRICTED ACCESSDownload PDF (204K)
- |<
- <
- 1
- >
- >|