Further improved mechanical properties of polypropylene by shish-kebab structure and high-temperature annealing,Polymer Engineering and Science

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Further improved mechanical properties of polypropylene by shish-kebab structure and high-temperature annealing
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2022-08-09 , DOI: 10.1002/pen.26108
Dashan Mi ₁ , Zhongguo Zhao ₂ , Shikui Jia ₂

Affiliation

Multiflow injection molding is used to prepare a highly oriented shish-kebab structure, and the mechanical properties of Polypropylene in the weak direction (WD) and strong direction (SD) are analyzed in this work. The oriented structure shows strong anisotropy. For example, the impact strength in SD is 6 times that of WD. One or three minutes of high-temperature-annealing (HTA, 30°C higher than T_m) has been proven to be an effective method to trigger the partial melting and re-crystallization process, which in turn, can improve the shish-kebab structure and greatly improve yield and impact strength in both WD and SD. Furthermore, results confirm that the chains in the amorphous region play a key role in the mechanical properties in the WD, while the shish-kebab crystal structure determines the properties in the SD. Using shish-kebab structure and HTA to improve mechanical properties in both SD and WD directions will be helpful to avoid generating fiber composites that create recycling difficulties and loss of properties with cycle times.

中文翻译：

通过烤肉串结构和高温退火进一步提高聚丙烯的机械性能

采用多流注塑法制备高度取向的烤肉串结构，分析聚丙烯在弱方向（WD）和强方向（SD）的力学性能。定向结构显示出强烈的各向异性。例如，SD 中的冲击强度是 WD 的 6 倍。一到三分钟的高温退火（HTA，高于T _{m 30°C}) 已被证明是触发部分熔化和再结晶过程的有效方法，这反过来又可以改善 shish-kebab 结构，并大大提高 WD 和 SD 的屈服强度和冲击强度。此外，结果证实非晶区中的链在 WD 中的机械性能中起关键作用，而 shish-kebab 晶体结构决定了 SD 中的性能。使用烤肉串结构和 HTA 来改善 SD 和 WD 方向的机械性能将有助于避免生成纤维复合材料，这些复合材料会造成回收困难和性能随循环时间而损失。

更新日期：2022-08-09

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