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对高聚物的声发射做了进一步的实验观察。玻璃态高聚物在拉伸屈服以前的声发射有Kaiser效应,但在高弹态则不然。非晶态高聚物从玻璃态到高弹态的转变,玻璃态拉伸时在屈服附近出现声发射,高弹态时声发射要少而弱得多,只在高弹拉伸的断裂前出现声发射。非晶态、晶态高聚物或共混高聚物在突然升温到100℃时有声发射,但在突然降温到-60℃时却不出现声发射,这可能也说明声发射与高聚物试样内形成空洞有关。一种聚丙烯树脂在不同注射成形工艺条件下所得试件,在拉伸时的声发射行为可反映加工成形的好坏,成形好的声发射少得多。
Acoustic emission of the polymer made further experimental observations. Acoustic emission of glassy polymers before tensile yielding has a Kaiser effect, but not in high-elastic states. The transition from glassy state to high-elastic state of amorphous polymer shows acoustic emission near the yield in the glass-state stretching, but the acoustic emission in the high-elastic state is less and weaker than that before the high-elastic-tensile fracture Acoustic emission appears. Acoustic emission occurs when the amorphous, crystalline polymer or blend polymer suddenly increases in temperature to 100 ° C, but does not appear to be abruptly cooled down to -60 ° C, which may also explain the relationship between acoustic emission and polymer Cavity formed within the sample. A sample of polypropylene resin obtained under different injection molding process conditions, the acoustic emission behavior when stretched can reflect the processing of good or bad shape, formed sound emission much less.