| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9559406 | Polymer | 2005 | 8 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
I.H. Craig, J.R. White, Phua Chai Kin,