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Influence of the Injection Molding Process on the Free Volume and Its Effect on the Creep Behavior of Styrene-Acrylonitrile Copolymer

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Abstract

Measurements on the creep behavior of injection moldedstyrene-acrylonitrile copolymer (SAN) samples are described andanalyzed. It is shown that the processing conditions have a distincteffect on the tendency to creep and that the differences in creepbehavior are mainly due to differences in frozen-in free volume, whereasthe different state of molecular orientation and internal stress haveonly a neglegible effect on the creep behavior. In addition, the timebetween processing and testing of the material plays an important rolefor the deformation behavior of the amorphous polymer; this phenomenonis known as physical aging. A slower cooling rate during thesolidification of the injection molded part, as well as a longer agingtime, lead to a reduced free volume and therefore to a reduced tendencyto creep.

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Authors and Affiliations

  1. Institute of Mechanical Engineering and Plastics Technology, Chemnitz University of Technology, 09107, Chemnitz, Germany

    K. Engelsing & G. Mennig

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  1. K. Engelsing
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  2. G. Mennig
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Engelsing, K., Mennig, G. Influence of the Injection Molding Process on the Free Volume and Its Effect on the Creep Behavior of Styrene-Acrylonitrile Copolymer. Mechanics of Time-Dependent Materials 5, 27–38 (2001). https://doi.org/10.1023/A:1009858702188

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  • DOI: https://doi.org/10.1023/A:1009858702188

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