苎麻布/聚丙烯复合材料的力学性能

利用聚丙烯及苎麻布作原料、马来酸酐接枝聚丙烯 (MAPP) 作界面增容剂, 采用模压工艺, 在175℃, 5、10、15及20 MPa四种压力下成型复合材料, 研究了MAPP质量分数、苎麻布质量分数及成型压力对复合材料力学性能的影响。复合材料的拉伸强度和弯曲强度在MAPP加入量为 3 %和 5 %时分别达最大值 46.72 MPa和 68. 43 MPa , 较无MAPP的复合材料的强度值分别提高 50. 95 %和 61. 81 %; 拉伸模量及弯曲模量因使用MAPP而增加, 但拉伸断裂伸长率却会下降。随着苎麻布质量分数增加, 复合材料拉伸强度、 拉伸模量、弯曲模量均逐渐增加; 苎麻布质量分数10 %、20 %的复合材料在较低的压力 (5、10 MPa) 下成型时 , 其拉伸强度和弯曲强度值相对更高, 当苎麻布质量分数超过20 %后, 成型压力对力学性能的影响无明显的规律。 

Mechanical properties of ramie cloth/polypropylene composites

Using polypropylene ( PP) and ramie cloth as raw materials , and maleated polypropylene (MAPP) as the compatibilizer , the composites were compressed at 175℃ under 5 , 10 , 15 and 20 MPa , respectively. The effect s of the mass f ractions of both MAPP and ramie cloth and pressures on the mechanical properties of the com2 posites were investigated. The maximum tensile st rength of 46. 72 MPa and flexural st rength of 68. 43 MPa of the composites are obtained when 3 % and 5 % MAPP are used , which are increased f rom those of the composites with2 out MAPP by 501 95 % and 61. 81 % , respectively. Both the tensile and flexural moduli increase because of the ap2 plication of MAPP , while the elongations at break will decrease. When more ramie cloths are used , the modulus al2 ways increases ; the composites containing 10 % or 20 % ramie cloth have greater st rength when formed under lower pressures (5 , 10 MPa) , but no regulations can be found for the effect s of pressures on the st rength when the mass f ractions of ramie cloth are more than 20 %.