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ABSTRACTThe effect of benzophenone photo-initiator on some mechanical properties of photo-oxidized polypropylene / thermoplastic starch blends has been investigated. Polypropylene-graft-maleic anhydride (PP-g-MA) was used as compatibilizer while benzophenone served as photo-initiator. The various polypropylene / thermoplastic starch blend samples were compounded in an injection moulding machine. The already weighed prepared blend samples were subjected to photo-oxidation in an open atmosphere to sunlight at an inclination angle of 45 o C for a period of six (6) months at regular intervals of zero (0), three (3), and six (6) months during the dry season. The effect of benzophenone photo-initiator on the blends was evaluated by mechanical property measurements and weight losses. Experimental results obtained showed that the tensile strength, and extension at break of the photo-oxidized polypropylene / thermoplastic starch blended samples were found to decrease with increases in thermoplastic starch, and benzophenone content, while the impact strength, hardness, and weight losses of the blend samples increased with increases in the maleicgraftanhydride polypropylene, and benzophenone contents as well as periods of exposure.

The Effect of Benzophenone Photo-Initiator on Some Mechanical Properties of Photo-Oxidized Polypropylene / Thermoplastic Starch Blends