All-thermoplastic bumpers have been used in Ford passenger cars since mid-1980's. The all-plastic bumper is an injection-molded facebar bonded to an injection-molded backplate forming a box beam. It provides benefits such as light weight, cost effectiveness, and corrosion resistance compared with a metallic counterpart. The bumpers are made of a blend of polycarbonate (PC) and polybutylene terephthalate (PBT). The blend is a biphasic system with partial compatibility of the polymers; with additional impact modifiers it has a very high impact strength even at low temperature. Properties of thermoplastic bumpers made of polycarbonate (PC) and polybutylene terephthalate (PBT) blend were evaluated after several years of service in the field. In this study we measured th Izod impact strength, PC molecular weight, and melt flow rate of bumpers collected from various geographical areas in the U.S. Generally, the system had good impact resistance after more than five years of service in the field, retaining most of the original impact strength. There were small changes in PC average molecular-weights and melt flow rates. The results showed that changes depended on both exposure time and the weather conditions of the environment.


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    Title :

    The long-term durability of thermoplastic bumpers


    Additional title:

    Die Langzeit-Haltbarkeit thermoplastischer Stoßdämpfer


    Contributors:
    Tao, W.H. (author) / Golovoy, A. (author) / Zinbo, M. (author) / Bauer, D.R. (author)

    Published in:

    Publication date :

    1993


    Size :

    4 Seiten, 1 Bild, 2 Tabellen, 10 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    The Long-Term Durability of Thermoplastic Bumpers

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    Golovoy, A. / Bauer, D. R. / Zinbo, M. et al. | SAE Technical Papers | 1993


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