NIPPON GOMU KYOKAISHI
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Volume 83, Issue 9
Displaying 1-10 of 10 articles from this issue
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Special Issue for General Reviews “Present and Future of Thermoplastic Elastomer”
Introductory Remarks
General Reviews
  • [title in Japanese]
    [in Japanese]
    2010 Volume 83 Issue 9 Pages 268
    Published: 2010
    Released on J-STAGE: February 15, 2011
    DOIhttps://doi.org/10.2324/gomu.83.268
    JOURNAL FREE ACCESS
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  • Trends and Future of Thermoplastic Elastomers
    Yasuhiko TAKEMURA
    2010 Volume 83 Issue 9 Pages 269-276
    Published: 2010
    Released on J-STAGE: February 15, 2011
    DOIhttps://doi.org/10.2324/gomu.83.269
    JOURNAL FREE ACCESS
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    Thermoplastic Elastomer (TPE) was commercially produced first about 45 years ago. This article affords basic knowledge, then reviews recent technological trends and the future of TPE, especially in Japan.
    Many new kinds or new grades of TPE with high performance have been appeared in last about 10 years. As the typical examples, hydrogenated type TPS and TPV in TPO/TPEE/TPAE are given. As new type TPEs, SIBS and MMA-nBA-MMA block copolymers have been put on the market recently.
    Since TPEs are useful materials from the viewpoints of global environmental problem, energy saving, and declining birthrate/aging society problem, their market will expand in the future.
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  • What Brings Mechanical Properties of Themoplastic Polyurethane Elastomers?
    Mutsuhisa FURUKAWA
    2010 Volume 83 Issue 9 Pages 277-283
    Published: 2010
    Released on J-STAGE: February 15, 2011
    DOIhttps://doi.org/10.2324/gomu.83.277
    JOURNAL FREE ACCESS
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    Thermoplastic polyurethane elastomers (TPUs) can be given as one of the most popular polar thermoplastic elastomers (TPEs). The TPUs are usually composed of soft segment formed with polymer glycol and hard segment done with diisocyanate and chain extender. Though olefinic TPEs are simple chemical and micro-phase structures, TPUs are very numerous chemical and micro-phase structures. Physical properties of the TPUs are strongly dependent on micro-phase structures. In this review, it was described on the origin of rubber elasticity of polyurethane elastomers, the direct observation of the microphase separated structure of the TPUs using AFM, and the molecular design factors for high performance TPUs.
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  • Properties and Applications of Polyisobutylene - based Thermo Plastic Elastomer
    Hironari NAKABAYASHI
    2010 Volume 83 Issue 9 Pages 284-288
    Published: 2010
    Released on J-STAGE: February 15, 2011
    DOIhttps://doi.org/10.2324/gomu.83.284
    JOURNAL FREE ACCESS
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    Polyisobutylene - based thermoplastic elastomer (SIBS) is polymerized by living cationic polymerization and has excellent thermostability, gas barrier property, flexibility and dumping property. SIBS can be used as a pressure-sensitive adhesive molded by co-extrusion and a modifier for thermoplastic polyurethane and some engineering plastics such as poly ethylene vinyl alcohol copolymer and cyclic olefin copolymer.
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  • Development of New Olefin Polymerization Catalysts and Their Applications to the Creation of Value-Added Olefin-Based Materials
    Kaori MATOISHI, Naoshi NAGAI, Terunori FUJITA
    2010 Volume 83 Issue 9 Pages 289-295
    Published: 2010
    Released on J-STAGE: February 15, 2011
    DOIhttps://doi.org/10.2324/gomu.83.289
    JOURNAL FREE ACCESS
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    This contribution reports on the development and applications of a new family of next generation olefin polymerization catalysts for the creation of value-added olefin-based materials. Our own research based on a "ligand oriented catalyst design concept" has resulted in the discovery of new high-performance olefin polymerization catalysts named FI catalysts. FI catalysts in association with appropriate cocatalysts can exhibit a number of unique features, including exceptionally high ethylene insertion ability, high functional group tolerance, MAO- and borate-free polymerization catalysis and precise control over chain transfers. Due to these features, FI catalysts have created a wide variety of value-added olefin-based materials which include ethylene/polar monomer copolymers, ultrafine and noncoherent polyethylene (PE) particles, polyolefinic block copolymers and selective vinyl-terminated PEs. The vinyl-terminated PEs can readily be converted to well-defined terminally-functionalized PEs and PE/polyethylene glycol hybrid materials.
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  • Direct Bonding Technology by Chemical Reactions at the Interface and the Applications of Polyamide Elastomer (PEBA)
    Mitsuteru MUTSUDA
    2010 Volume 83 Issue 9 Pages 296-302
    Published: 2010
    Released on J-STAGE: February 15, 2011
    DOIhttps://doi.org/10.2324/gomu.83.296
    JOURNAL FREE ACCESS
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    Regarding a bonding between conventional PEBA and TPU, it has following difficulties : (a) The PEBA which has less soft segment, i.e. harder PEBA is difficult to bond with TPU directly by Insert molding. (b) Overmolding TPU onto the inserted PEBA can not get a good bonding. Overmolding PEBA onto inserted TPU should be applied for a good bonding. (c) The bonding strength strongly depends on the chemical structure of the soft segment of TPU.
    Daicel-Evonik Ltd. had prepared several kinds of PEBAs based on the concept of the bonding by interfacial reactions for the bonding test with TPU and it was confirmed the concept could solve these problems of conventional PEBA. Additionally it was found that PEBA specimen as an insert was not influenced by a storage time before TPU’s overmolding, although TPU specimen lost its bonding performance by the time of the storage. This “PEBA insert system” was not available until Daicel-Evonik’s new PEBA and PA12. It is expected that these advantages of Daicel-Evonik’s new PEBA and PA12 will be able to contribute to new fine design, cost saving and stable mass production.
    These new PEBA and PA12 also can bond with rubber based on K&K concept. Rubber + new PEBA + TPU three layer sheet is introduced as one of the examples of new application.
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  • High Melt Strength Polyolefin Elastomers (HMS POEs) and Olefin Block Copolymers (OBCs)
    Michio ONO, Takahiko OHMURA
    2010 Volume 83 Issue 9 Pages 303-309
    Published: 2010
    Released on J-STAGE: February 15, 2011
    DOIhttps://doi.org/10.2324/gomu.83.303
    JOURNAL FREE ACCESS
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    Novel polyolefin elastomers, HMS POE and OBC were introduced. HMS POE is a high melt strength ethylene-α-olefin random copolymer with certain level of long chain branches and high molecular weight which have provided unique rheological properties such as higher melt strength, higher melt elasticity, shear shining property under a given shear and strain hardening. These rheological attributes have enabled higher through-put for extrusion profile, thermoforming sheet without any tear and webbing and stable parison retention for blow molding. Moreover, OBC is a multi-block copolymer consisting of hard- and soft-blocks covalently bonded together. Due to the presence of crystalline hard blocks, it provides heat resistant elastomer, faster crystallization rate leading to cycle time reduction and comparable compression set property to that of cross-linked TPV products.
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Technical Note
Erratum
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