Study On The Maleic Anhydride Grafted Bagasse/PP Composite

Using nature fibers replace synthetic fiber to produce fiber/thermoplastics composites arepracticably rather important for alleviating burden environment, energy saving, and so on.Three kinds of Bagasse fiber(BA, BF, MAH-g-BF) and PP are selected to produce compositesin this work. Crystallization morphology, thermal and mechanical behavior of composites arestudied to probe the relationship between composites morphology and properties. Mechanicalproperties have increased at different extents. Main contents are as follows:(1) By orthogonal experiment, the optimum technological conditions of synthesizingMAH modified BF. The results showed the optimum of MAH to DMF (V:V) was5:7, amountof hydroquinone was1wt％, the suitable temperature was100℃, and the reaction time was5h. The modified bagasse fiber was assessed by means of FT-IR and TG. The results showedthe absorption peak of C=O (1730cm-1) and thermal stability increased.(2) Blends of PP and bagasse fiber at mass fraction(0.5wt％,1wt％,2wt％and3wt％)were prepared using solution precipitation method, respectively. Crystallization Morphologyand crystallinity was studied by PLM and X-ray diffraction(XRD). The result showed thatthree kinds of bagasse fiber can both induce α-transcrystallization in composites and increasethe degree of crystallization of PP and mechanism of forming transcrystallization wasproposed. The modified BF enhanced the growth ability of transcrystallization and promotedPP to form more fine and perfect transcrystallization than the unmodified BF.(3) Blends of PP and different bagasse fiber having different mass fraction(0.5wt％,1wt％,2wt％and3wt％) were prepared by using a twin screw extruder and mould pressuremethod. Mechanical properties of PP were measured using impact test enginery andmicro-computer control universal test machine. The result showed that three kinds of fibercan improve mechanics properties of PP in different degree. Impact strength, tensile strength,Young’s modulus and bending strength of PP were increased10.5~21.5%,23.0~34.3%,22.9~34.7%and10.4~19.2%, respectively.Optimal amount of three kinds of bagasse fiber all were1wt％, and modified bagassefiber can greatly increase mechanical properties of PP.