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UV degradation of recycled photo-degraded polymers

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


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The ultraviolet (UV) degradation of molded bars containing recycled polymer has been studied to determine whether products of photo-degradation act as prodegradants. Recyclate that had been photo-degraded prior to recycling was mixed with virgin granules to mold new bars. Bars were also prepared from a mixture of virgin polymer with recyclate that had not been photo-degraded. Bars made from blends of virgin and recycled polymer were photo-degraded in the laboratory. For exposures of less than a month, the mechanical properties of both polystyrene and polypropylene were inferior when previously photo-degraded material was included. After extended exposure, the effect of including photo-degraded material diminished but by this time, the properties of the materials were unacceptable.

Publication metadata

Author(s): Craig IH; White JR; Loyd E; Stevenson W

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 61st Annual Technical Conference (ANTEC)

Year of Conference: 2003

Pages: 1630-1634

ISSN: 1539-2252

Publisher: Society of Plastics Engineers, Inc.