NIPPON GOMU KYOKAISHI
Print ISSN : 0029-022X
Search
Advanced search
OR
Browse
Search
Volume 86, Issue 12
Displaying 1-8 of 8 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
Special Issue for General Reviews “Advanced soft materials for extreme environments”
Introductory Remarks
General Reviews
  • [title in Japanese]
    [in Japanese]
    2013 Volume 86 Issue 12 Pages 352-
    Published: 2013
    Released on J-STAGE: February 06, 2014
    DOIhttps://doi.org/10.2324/gomu.86.352
    JOURNAL FREE ACCESS
    Download PDF (180K)
  • Carbon Nanotube Rubber Composoites Playing an Active Part in Deep Harsh Environments of the Earth
    Toru NOGUCHI, Hiroyuki UEKI, Masaei ITO, Osamu OSAWA, Morinobu ENDO
    2013 Volume 86 Issue 12 Pages 353-359
    Published: 2013
    Released on J-STAGE: February 06, 2014
    DOIhttps://doi.org/10.2324/gomu.86.353
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Production environment of natural gas and oil, which is one of the most important resources, have become increasingly stringent. Working temperature and pressure environment is approaching to 200°C and to 200 MPa, respectively. Wells for natural gas and oil is surrounded by a substance having a high aggression, such as hydrogen sulfide, strong acid and strong alkali. We have to challenge the production in harsh environments of deep underground in this way. Carbon black reinforced rubber have been used for many years as an important component in the oil industry, but these rubber did not lead to major advances in the oil field. Recently, the rubber composites obtained from the carbon nanotubes cellulation technology increases operational ratings from 175°C and 140 MPa to 260°C and 240 MPa for deeper, hotter conditions, and it is especially appropriate for deepwater reservoirs. In this paper, we describe a cellulation technology and explain the actual situation of the rubber playing an active part in an environment of the worst.
    View full abstract
    Download PDF (2461K)
  • Fracture Behavior of Ethylene Propylene Rubber for Hydrogen Gas Sealing Under High-pressure Hydrogen
    Shin NISHIMURA
    2013 Volume 86 Issue 12 Pages 360-366
    Published: 2013
    Released on J-STAGE: February 06, 2014
    DOIhttps://doi.org/10.2324/gomu.86.360
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    High-pressure hydrogen gas seal is one of key technologies for realization of hydrogen energy system. It is important to understand the durability of high-pressure gas seal. Ethylene-propylene rubber (EPDM) and acrylonitrile-butadiene rubber (NBR) composites filled with carbon black, silica, and unfilled composites were exposed to high-pressure hydrogen gas. The addition of carbon black raised the hydrogen content of the composite, while the addition of silica did not. The blister fracture of composites with silica was less pronounced, irrespective of the hydrogen pressures. This can be attributed to their lower hydrogen content and higher strength than the others. In order to evaluate the influence of hydrogen pressure and operation condition on durability of sealing rubber materials under high-pressure hydrogen gas, a durability tester which enables the sealing rubber to apply high pressure hydrogen gas pressure at arbitrary test conditions was developed. Durability and hydrogen permeation properties of vulcanized EPDM composite filled with white reinforcing filler were evaluated. In the case of maximum pressure of 35 MPa and 70 MPa at 100°C, O-ring was highly damaged in terms of blister fracture and overflow fracture. Overflow fracture is originated from volume inflation of the rubber material in the O-ring groove.
    View full abstract
    Download PDF (1602K)
  • Evaluations of Polymeric Materials in Space Environment for Space Use
    Kazuyuki MORI, Eiji MIYAZAKI
    2013 Volume 86 Issue 12 Pages 367-372
    Published: 2013
    Released on J-STAGE: February 06, 2014
    DOIhttps://doi.org/10.2324/gomu.86.367
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Wide-ranging polymeric materials are commonly used in spacecraft to meet numerous system design requirements. The tolerance of such polymeric materials against the space environment, e.g. vacuum, ultraviolet rays, radiation, atomic oxygen, etc. must be evaluated, because this environment is a known threat for materials, especially polymers. JAXA has been striving to evaluate the tolerance of polymeric materials in the space environment through both ground tests and space exposure experiments, which allows engineers in the space industry to obtain material data detailing tolerance against the space environment. This article introduces the space environment and its effect on polymeric materials, examples of damage to materials in orbit, and the evaluation capabilities for polymeric materials to be used in space at the Tsukuba Space Center, JAXA.
    View full abstract
    Download PDF (1742K)
  • Application of Polymeric Materials to Outdoor Electrical Insulating Apparatuses
    Hiroya HOMMA
    2013 Volume 86 Issue 12 Pages 373-377
    Published: 2013
    Released on J-STAGE: February 06, 2014
    DOIhttps://doi.org/10.2324/gomu.86.373
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Polymeric materials have the advantage of light weight, ease of manufacturing and feasibility for various shapes, compared with porcelain one. Application of the polymeric materials to outdoor electrical insulating apparatuses has achieved to reduce the size, weight of the equipments, and maintenance cost of the electrical power lines. Especially, silicone rubber can show good weatherability and hydrophobicity, so that it has been widely applied to polymeric insulators for outdoor use. Polymeric insulators are gaining market share as a result of improved tolerance to pollution, ease of handling and installation. In this article, the state of research and development of the polymeric insulators and their application for the electrical power lines are provided.
    View full abstract
    Download PDF (1304K)
  • Development of Rubber Material for High Radiation Field
    Sadayoshi NAKATSUKASA, Takeshi TABASAKI, Akihiro YOSHIDA, Yoshito KADO ...
    2013 Volume 86 Issue 12 Pages 378-381
    Published: 2013
    Released on J-STAGE: February 06, 2014
    DOIhttps://doi.org/10.2324/gomu.86.378
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Generally flexible polymeric materials exposed to radiation can’t be used because they soften or harden remarkably in high radiation environment. Aromatic polymers such as PEEK, PI, and PES are also known as radiation-proof polymeric materials. Aromatic polymers are very hard, they can’t be used for products like a packing where flexibility is required. We developed a new vulcanized rubber compound by the use of various additives and polymer blend. This developed rubber compound has a high radiation-proof performance by reaction balance of cross-linking and decomposition in this rubber. This rubber compound has a rubber elasticity even if exposed to radiation of MGy level, and its radiation proof is more than 5 times as high as conventional polymeric materials. This rubber compound is much more flexible than the aromatic polymers which are the used as conventional radiation-proof polymers.
    View full abstract
    Download PDF (1325K)
Technical Note
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top