Minimizing the creep of recycled polypropylene/rubberwood flour composites with mixture design experiments

Author

Chatree Homkhiew1

Thanate Ratanawilai1⇑

Wiriya Thongruang2

1. ¹Department of Industrial Engineering, Faculty of Engineering, Prince of Songkla University, Thailand
2. ²Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Thailand

1. Thanate Ratanawilai, Department of Industrial Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand. Email: thanate.r@psu.ac.th

Abstract

Composites of rubberwood flour (RWF) and recycled polypropylene (rPP) were produced into panel samples by using a twin-screw extruder. The effects on creep behavior of mixture fractions of rPP, RWF, maleic anhydride-grafted polypropylene (MAPP), and ultraviolet (UV) stabilizer were studied in a D-optimal mixture design. Creep was significantly affected by the composition. Increasing the fraction of RWF decreased creep, while MAPP and UV stabilizer increased it. The models fitted were used to optimize a desirability score that balanced multiple creep characteristics. The model-based optimal formulation 50.5 wt% rPP, 44.9 wt% RWF, 3.5 wt% MAPP, 0.1 wt% UV stabilizer, and 1.0 wt% lubricant was experimentally validated to have low creep closely matching the model predictions.

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http://jcm.sagepub.com/content/49/1/17.abstract