Time-resolved small-angle X-ray scattering study of void fraction evolution in high-density polyethylene during stress unloading and strain recovery

• DOI: 10.1002/pi.4928
• Publication Date: 2015-04-14T05:09:46Z
• Authors: Frédéric Addiego; Stanislav Patlazhan; Kui Wang; Stéphane André; Sigrid Bernstorff; David Ruch
• Keywords: High-density polyethylene; Void (composites); Volume fraction; Strain (injury)

By means of time-resolved small-angle X-ray scattering, we developed an analysis methodology to assess the void volume fraction ϕv in high-density polyethylene (HDPE) during tensile testing. The specimens were first drawn up different imposed strains, and subsequently subjected stress unloading strain recovery stages. During loading stage, progressively increased with level, starting from a well-defined onset prior yield point. In particular, reached maximum 8.75 vol% for 12.5% case HDPE grade molecular weight 105 000 g mol−1. Stress caused decrease attained at end stage. For 55 mol−1, was more important stage less marked when compared residual reversible components revealed. © 2015 Society Chemical Industry