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Mechanical properties and morphology of intumescent flame retardant filled polypropylene composites

机译：膨胀型阻燃填充聚丙烯复合材料的力学性能和形貌

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The intumescent flame retardant (IFR) filled polypropylene (PP) composites were prepared using a twin-screw extruder. The tensile and impact fracture behavior of the composites were measured at room temperature. It was found that the Young's modulus increased roughly, while the tensile strength decreased slightly with increasing the IFR weight fraction; the toughening effect of the filler on the PP resin was significant. Both the V-notched Izod impact strength and the V-notched Charpy impact strength of the PP/IFR composites showed a nonlinear increase with increasing the filler weight fraction (φ_f) as φ_f was less than 20%, then it decreased. The limited oxygen index of the composites increases nonlinearly with increasingφ_f. The relationship between them obeyed a quadratic equation. The impact fracture surface was observed by means of a scanning electronic microscope to understand the toughening mechanisms for the composite systems.
机译：使用双螺杆挤出机制备膨胀型阻燃剂（IFR）填充的聚丙烯（PP）复合材料。在室温下测量复合材料的拉伸和冲击断裂行为。发现，随着IFR重量分数的增加，杨氏模量大致增加，而抗张强度略有下降;填料对PP树脂的增韧作用是显着的。 PP / IFR复合材料的V型缺口悬臂梁冲击强度和V型缺口夏比冲击强度均随着Φ_f小于20％随填料重量分数（φ_f）的增加而非线性增加，然后降低。复合材料的极限氧指数随φ_f的增加而非线性增加。它们之间的关系服从二次方程。用扫描电子显微镜观察冲击断裂表面，以了解复合体系的增韧机理。

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