All issues
Predecessor
Volume 41, Issue 2
Displaying 1-13 of 13 articles from this issue
- |<
- <
- 1
- >
- >|
-
(PART I) PHYSICAL PROPERTIES OF POLYBUTADIENE-POLYRENE BLENDK. Satake1968 Volume 41 Issue 2 Pages 81-88
Published: February 15, 1968
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe physical properties of the binary blend of polybutadiene rubber and polystyrene resin were studied with the following results obtained. The physical properties of the blends vary in a similar way with the blend ratio, although they differ for different kinds of polystyrene resin.
Some of the physical properties change linearly with the blend ratio while the others vary suddenly at a certain blend ratio. This is probably due to the phase transition from rubber phase to plastics phase.
So far as styrene-butadiene copolymer resin is concerned among polystyrene resins, the physical properties vary monotonously as the styrene content decreases.
It is also concluded that a general purpose grade polystyrene resin is industrially suitable for practical use as the so-called high styrene resin.View full abstractDownload PDF (1214K) -
1968 Volume 41 Issue 2 Pages 88
Published: 1968
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSDownload PDF (167K) -
(PART II) SOFTENING PHENOMENON OF POLYBUTADIENE-POLYSTYRENE BLEND DURING REMILLING PROCESSK. Satake1968 Volume 41 Issue 2 Pages 89-95
Published: February 15, 1968
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSForty wt % blend of general purpose polystyrene resin with polybutadiene rubber is very hard and shows poor processability, when it is prepared by open mill under ordinary conditions.
However, this hard compound was found to be softened and show excellent processability when it is remilled by open mill at a surface temperature of 90°C.
The effects of blend ratio and remilling temperature were studied with the following results obtained. The softening is observed clearly when the blend is composed of 20 to 60 wt % of general purpose polystyrene resin and the surface temperature of remilling roll is below 120 °C. This phenomenon is caused by socalled phase transition of general purpose polystyrene resin from continuous phase to non-continuous one.View full abstractDownload PDF (6664K) -
K. Nezu1968 Volume 41 Issue 2 Pages 96-99
Published: February 15, 1968
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSOn “Royalene 200” (U.S. Rubber Co.) as Ethylene-Propylene Rubber (EPDM), author made several experiments for the purpose of studying its thermal stability and thermal behavior.
Mainly using the mass spectra and partially the infrared absorption spectra, thermogravimetric analysis and differential thermal analysis, the thermal oxidation and the pyrolysis products of EPDM were studied.
In consequence it was found that chain scission occurred preferentially to cross-linking in the thermal oxidation and that the parts of propylene were preferentially subject to hydrolysis to the parts of ethylene.View full abstractDownload PDF (617K) -
II. THE COMPARISON OF THE THEORETICAL DISTRIBUTION WITH THE OBSERVED DISTRIBUTIONS. Yabuta1968 Volume 41 Issue 2 Pages 100-104
Published: February 15, 1968
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe previous part of this series stated that the third asymptotic probability function of the smallest values could be satisfactorily used to govern the observed distributions of tensile data on some rubber vulcanizates. However, no test for goodness of fit was made there.
In the present paper, the theoretical distribution was compared with the observed one by using χ2-statistics and constructing a control curve on a probability paper. The test resulted in good agreement of the theoretical distribution with the observation.View full abstractDownload PDF (833K) -
(I) SULFUR CURE OF PORK. Azuma, K. Shikata, H. Utamura, Y. Minoura1968 Volume 41 Issue 2 Pages 105-110
Published: February 15, 1968
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe vulcanizations of POR with sulfur and accelerators were studied. The POR used had 3 mole % unsaturates and its Mooney viscosity (ML1+4 at 100°C) was 30-40. It was found that 1 phr of Zn DMDC, TMTD and TS as accelerators were most suitable for POR vulcanization and Zn DBDC, Se DEDC and Te DEDC were also good accelerators. The proper amounts of sulfur was about 1 phr and when more than 1 phr of sulfur was used, the blooming of sulfur was observed. More than 1 phr of zinc oxide and about 1 phr of stearic acid were necessary and proper for processing.View full abstractDownload PDF (807K) -
(II) PROPERTIES OF PURE GUM VULCANIZATES OF PORY. Ueno, T. Kasabo, T. Hanada, T. Sadahiro, Y. Minoura1968 Volume 41 Issue 2 Pages 111-115
Published: February 15, 1968
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSSome properties of pure gum vulcanizates of POR, a new type synthetic rubber, were discussed comparing with natural rubber (NR). The physical properties of vulcanizates obtained were much the same as those of NR.
POR was very good in heat resistance as expected from its having no double bond in main chain, and slightly superior in oil resistance to NR. Vulcanizates of POR swelled in methyl alcohol and acetone in which those of NR did not. But the properties after drying did not deteriorate. Vulcanizates of both severely swelled in tetrachloroethylene and the properties after drying slightly deteriorated, but the ratio of decrease for POR was smaller than that for NR. Also, POR had superior ozone resistance to NR.View full abstractDownload PDF (827K) -
PART II. STRESS CONCENTRATION FACTOR IN TEARING OF VULCANIZED RUBBERSK. Yagii, K. Ninomiya1968 Volume 41 Issue 2 Pages 116-122
Published: February 15, 1968
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSAt the tip of a cut in a thin rubber film being deformed at a constant rate of extension, we may reasonably assume that the type of deformation is essentially one of simple extension and the rate of strain there is kγ times larger than that of the rest in the sample.
Assuming that the value of kγ is little affected by the magnitude of strain, it is shown that the value of kγ can be estimated by combining the experimental data obtained for the films with and without a cut at various rates of elongation.
The coefficient, kγ thus estimated, appears generally to increase linearly with the cut length, C in the form, kγ-1= mγc
Here the constant, mγ, is the stress concentration factor which is independent of the shape and size of the sample. This factor, mγ, is found to be drastically reduced by the addition of suitable amount of active carbon black fillers. It is also found that mγ depends on temperature in a manner characteristic of each material quality.View full abstractDownload PDF (1178K) -
1968 Volume 41 Issue 2 Pages 122
Published: 1968
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSDownload PDF (145K) -
[in Japanese], [in Japanese]1968 Volume 41 Issue 2 Pages 123-132
Published: February 15, 1968
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSDownload PDF (1799K) -
[in Japanese]1968 Volume 41 Issue 2 Pages 133-140
Published: February 15, 1968
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSDownload PDF (7109K) -
[in Japanese]1968 Volume 41 Issue 2 Pages 141-150
Published: February 15, 1968
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSDownload PDF (1591K) -
1968 Volume 41 Issue 2 Pages 151-152
Published: February 15, 1968
Released on J-STAGE: October 16, 2009
JOURNAL RESTRICTED ACCESSDownload PDF (363K)
- |<
- <
- 1
- >
- >|