The Effect of Molecular Weight on Tensile Property and Fracture Toughness of the Polyimide Resin
The Effect of Molecular Weight on Tensile Property and Fracture Toughness of the Polyimide Resin
复制标题
分子量对聚酰亚胺树脂拉伸性能和断裂韧性的影响
DOI：
10.1299/kikaia.65.67
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Y. Yoshida
中科院分区：
文献类型：
--
作者：
M. Notomi;H. Inaba;K. Kishimoto;T. Shibuya;A. Morita;Y. Yoshida
研究了分子量对热塑性聚酰亚胺力学性能的影响。制备了分子量范围为2.5×104 g/mol ~ 3.8×104 g/mol的4种样品。通过拉伸试验确定了杨氏模量、拉伸强度和泊松比。以获得断裂韧性。由于裂纹扩展是以稳定的方式进行的，因此采用了多试样法JIC。虽然杨氏模量、拉伸强度和泊松比在所测试的分子量范围内几乎不变，但JIC随着分子量的增加而增加。在低分子量和高分子量试样的断裂面上分别观察到了肋状花纹和河流状花纹。这些观察结果表明，银纹显着增长的样品具有较高的MW。这被认为是断裂韧性增加的原因。在Kusy和Turner的基础上，得到了断裂韧性与分子量的关系。
The effects of molecular weight on mechanical properties of the thermoplastic polyimide are investigated. The specimens which have 4 different molecular weights (MW) ranging from 2.5×104 g/mol to 3.8×104 g/mol are prepared. Young's modulus, tensile strength and Poisson's ratio are determined by the tensile tests. To obtain the fracture toughness. JIC the multiple specimen method is applied since the crack propagation occurs in a stable manner. Although Young's modulus, tensile strength and Poisson's ratio are almost constant over the range of MW tested, the JIC increases with the increase of molecular weight. The rib-like pattern and the river-like pattern are observed on the fracture surfaces of lower and higher MW specimen, respectively. These observations indicate that the crazes significantly grow for the specimens with higher MW. This is considered to be the reason for the increase of fracture toughness. The relationship between the fracture toughness and molecular weight is obtained based on Kusy and Turner.