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首页> 外文期刊>Journal of Applied Polymer Science >Toughness profile in injection-molded polypropylene: The effect of the beta-modification
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Toughness profile in injection-molded polypropylene: The effect of the beta-modification

机译：注塑聚丙烯的韧性：β-改性的影响

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摘要

Fracture toughness characterized by the J-integral method has been evaluated along injection-molded bars of isotactic polypropylene. A significant increase in toughness with decreasing distance from the specimen gate has been observed with maximum steepness of the dependence in the central part of the specimen length. Parallel analysis of wide-angle X-ray diffraction patterns has shown a similar dependence of the crystalline beta-phase concentration. It is suggested that polypropylene with beta-crystallites has better structural continuity in the amorphous phase and, consequently, higher inherent ductility and superior macroscopic toughness than the related material containing only a-crystallites. Consequences of beta-phase gradients for practical toughness testing are also discussed. (C) 1998 John Wiley & Sons, Inc. [References: 13]
机译：已通过等规聚丙烯注射成型棒评估了以J积分法表征的断裂韧性。已经观察到，随着距样品门距离的减小，韧性显着增加，并且在样品长度中心部分的依赖性最大。广角X射线衍射图的平行分析显示出晶体β相浓度的相似依赖性。建议具有β-微晶的聚丙烯在非晶相中具有更好的结构连续性，因此比仅包含α-微晶的相关材料具有更高的固有延展性和优异的宏观韧性。还讨论了用于实际韧性测试的β相梯度的后果。 （C）1998 John Wiley＆Sons，Inc. [参考：13]

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