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Paper Information

Journal:   IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH   FALL 2017 , Volume 32 , Number 3 (60) #p00537; Page(s) 392 To 401.

Effect of thermal modification on physical and mechanical behavior of sunflowerpolypropylene composites

Author(s):  GHORBANI M.*, ZABIHZADEH S.M., Fooladian F.
* Department of Wood and paper, Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
The use of agricultural plants residues as alternative fiber resources in the cellulose industry can be recommended due to the severe shortage of wood raw material and restriction of forest harvesting. The aim of current research was to investigate the effect of thermal modification on the properties of composite made from sunflower flour-polypropylene. Thermal modification of sunflower flour was done at temperatures of 160, 180 and 200° C for 30 minutes and then these particles were mixed with polypropylene in ratio of 30 wt%. Test samples were prepared with maleic anhydride-grafted polypropylene as coupling agent by injection molding method. FTIR spectroscopy of sunflower flour confirmed the chemical changes due to thermal modification. More integration and uniform distribution, and less cavities were observed in the scanning electron micrographs of failure surface. The removal of hemicellulose of sunflower flour improved the thermal stability of composite, which thermal gravimetric analyzer (TGA) confirmed it with increasing the modification temperature up to 180° C. Modification at 200° C decreased thermal stability compared to other temperatures. Thermal modification leads to significant decrease in water absorption and improvement in bending and tensile properties due to hemicellulose degradation, increasing the crystallinity, loss of polarity, increased compatibility between the two phases of composite and uniform distribution of fillers in polymeric matrix. Notched impact strength of modified composites decreased due to better adhesion between lignocellulosic filler and polymer that facilitate the crack development along the interface. According to no significant difference between temperatures of 180 and 200° C, thermal modification of sunflower stems at 180° C is recommended for manufacturing of composites with optimum properties.
Keyword(s): Thermal modification,sunflower-polypropylene composites,thermal stability,physical properties,mechanical behavior
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