Effect of Thermo-Mechanical Degradation of Polypropylene on Hygroscopic Characteristics of Wood Flour-Polypropylene Composites

详细信息    查看全文

• 作者：Saeed Kazemi Najafi ; Morteza Mostafazadeh-Marznaki and Majid Chaharmahali
• 关键词：Wood flour ; polypropylene composites ; Recycling ; Water absorption ; Thickness swelling ; Extrusion
• 刊名：Journal of Polymers and the Environment
• 出版年：2010
• 出版时间：December 2010
• 年：2010
• 卷：18
• 期：4
• 页码：720-726
• 全文大小：257.8 KB

文摘

In this research, the influence of thermo-mechanical degradation of polypropylene (PP) on water absorption and thickness swelling of beech wood flour–PP composites were studied. For this purpose, a virgin PP was thermo-mechanically degraded by two times extrusion under controlled conditions. The results showed that the melt flow index, water absorption and thickness swelling of PP significantly increase by extrusion and re-extrusion. The virgin PP and degraded polypropylene were compounded with wood flour (at 60 % by weight wood flour loading) in a counter-rotating twin-screw extruder in presence or absence of MAPP to produce wood flour–PP composites. From the results, the composites containing recycled PP exhibited higher water absorption and thickness swelling. The use of MAPP decreased water absorption and thickness swelling in composites made of virgin or recycled PP.