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Crystallization and chemi-crystallization of recycled photo-degraded polypropylene

Lookup NU author(s): Dr Ian Craig, Emeritus Professor Jim White


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Injection moulded bars have been made from virgin polypropylene and from blends containing recycled photo-degraded polypropylene, then subjected to further ultraviolet (UV) exposure. Crystallinity measurements have been made at different depths from the exposed surface using X-ray diffraction and differential scanning calorimetry. Strong evidence for chemi-crystallization is provided for the photo-degraded samples. The crystallinity results are interpreted in terms of molecular scission and photo-initiated molecular defects. Scission leads to greater crystallizability and accounts for the observed chemi-crystallization. Molecular defects inhibit crystallization and eventually limit chemi-crystallization, as observed with a blend containing 75% virgin material and 25% recycled photo-degraded polymer after further UV exposure. (C) 2004 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Craig IH, White JR, Kin PC

Publication type: Article

Publication status: Published

Journal: Polymer

Year: 2005

Volume: 46

Issue: 2

Pages: 505-512

ISSN (print): 0032-3861

ISSN (electronic): 1873-2291

Publisher: Elsevier


DOI: 10.1016/j.polymer.2004.11.019


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