Study on the Properties of Polypropylene/Rice Husk Fiber Composites with Different Toughening Agents
In order to improve the toughness of polypropylene(PP)/plant fiber composite and expand its application in the field of high performance and low temperature,rice husk fiber(RH)was selected,and three different toughening agents SEBS,EPDM and POE were used to toughen PP/RH composite by melt blending through a twin-screw extruder.The effects of the type and content of toughener on the room temperature toughness,low temperature toughness,tensile properties and rheological properties of PP/RH composites were studied,and the toughening mechanism of the composites was further studied through the microstructure.The results illustrate that all the three toughening agents have good toughening effect on PP/RH composites,among which SEBS has the best toughening effect,which can be increased by 102%at room temperature and 166%at low temperature.The impact strength of composites with 10%SEBS is equivalent to the toughening effect of composites with 20%EPDM or POE.Similarly,the low temperature impact strength of PP/RH/SEBS10 composite material is 7 kJ/m2,which is equivalent to the toughening effect of 15%added POE and EPDM.When the toughener content is high,the introduced toughener forms a dispersed phase,absorbs a large amount of energy and transmits the external force to the rice husk fiber for fracture,so that the composite has higher impact resistance.In addition,the addition of toughening agent SEBS improved the viscosity of PP/PH composites more significantly than that of toughening agents EPDM and POE.
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