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通过单丝临界断裂长度法，研究了聚丙烯（ＰＰ）与玻璃纤维（ＧＦ）间界面剪切强度（ＩＳＳ），发现调节酸酐改性聚丙烯（ＭＰＰ）的加入量，可以相应调整ＩＳＳ；基体熔体与ＧＦ接触时间在８～１０ｍｉｎ以后界面才能结合完全。当ＩＳＳ小于４ＭＰａ时界面结合过弱，纤维在断口处与基体脱粘，形成空管状；ＩＳＳ高于７ＭＰａ时界面结合过强，纤维断口处基体产生垂直于纤维的裂缝，材料变脆；ＩＳＳ在４～７ＭＰａ时界面结合最佳，既不产生明显脱粘，也不产生向基体内扩张的裂缝。复合材料的宏观力学性能旁证了该结果
The interfacial shear strength (ISS) between polypropylene (PP) and glass fiber (GF) was investigated by means of the critical length of filament breaking method. It was found that adjusting the amount of anhydride modified polypropylene (MPP) Melt and GF contact time in 8 ~ 10min after the interface can be combined completely. When the ISS is less than 4MPa, the bonding of the interface is too weak, and the fiber debonds from the matrix at the fracture to form an empty tubular shape. When the ISS is higher than 7MPa, the bonding of the interface is too strong and the fracture of the matrix at the fiber fracture produces a fracture perpendicular to the fiber. 4 ~ 7MPa when the interface with the best, neither significant debonding, nor to expand the cracks within the matrix. The macroscopic mechanical properties of the composite fabricate this result