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首页> 外文期刊>Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing >Surface microstructural modification and fracture behavior of tensile deformed polypropylene with different percentage crystallinity
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Surface microstructural modification and fracture behavior of tensile deformed polypropylene with different percentage crystallinity

机译：不同百分比结晶度的拉伸变形聚丙烯的表面微观结构改性和断裂行为

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摘要

Microstructural evolution during tensile deformation of injection molded polypropylene (PP) at the micro- and nano-scale level was studied using atomic force and scanning electron microscopy techniques. Atomic force microscopy (AFM) enabled microstructural changes of tensile deformed PPs with different percentage crystallinity to be captured. AFM of undeformed slow-cooled (SC-PP: high crystallinity) and water-quenched (WQ-PP: low crystallinity) PPs suggested that the fibrils are relatively more closely packed in the SC-PP with higher average surface height of approx 7.5 nm as compared to approx 5.4 nm in the case of WQ-PP. Tensile deformed SC-PP and WQ-PP at displacement rates of approx 125-500 mm/mm (strain rates of approx 0.04 s~(-1) to 0.16 s~(-1)) indicated that the fibrils/microfibrils are aligned along the tensile axis, with WQ-PP exhibiting enhanced stretching of fibrils/microfibrils/chain-folded lamellae in comparison to SC-PP. Three fracture morphologies were identified at different strain rates, and include crazing/tearing (C), brittle fracture in association with crazing/tearing (B1), and brittle fracture together with ductile pulling of ligaments (B2). The fracture morphology exhibited by both SC-PP and WQ-PP was similar, but the percent area fraction of the three identified morphologies varied. WQ-PP with lower crystallinity was characterized by a decrease in percent of crazing/tearing (C) and brittle +crazing/tearing (B1), and increase in brittle +ductile pulling of ligaments (B2). The fracture characteristics of PPs with differences in crystallinity was consistent with AFM observations.
机译：使用原子力和扫描电子显微镜技术研究了聚丙烯和聚丙烯在拉伸变形过程中的微观结构演变。原子力显微镜（AFM）可以捕获具有不同百分比结晶度的拉伸变形PP的微观结构变化。未变形的慢冷（SC-PP：高结晶度）和水淬（WQ-PP：低结晶度）PP的原子力显微镜表明，原纤维在SC-PP中相对紧密堆积，平均表面高度较高，约为7.5 nm与之相比，WQ-PP约为5.4 nm。位移速率约为125-500 mm / mm（应变率约为0.04 s〜（-1）至0.16 s〜（-1））的拉伸变形SC-PP和WQ-PP表明，原纤维/微原纤维沿与SC-PP相比，WQ-PP的原纤/微原纤/链折叠片的拉伸增强。在不同应变速率下确定了三种断裂形态，包括开裂/撕裂（C），与开裂/撕裂相关的脆性断裂（B1），脆性断裂以及韧带的延展性（B2）。 SC-PP和WQ-PP均显示出相似的断裂形态，但是三种鉴定出的形态的面积百分率却有所不同。结晶度较低的WQ-PP的特征是降低了开裂/撕裂（C）和脆性+开裂/撕裂（B1）的百分比，而增加了韧带的脆性+延性拉伸（B2）。具有结晶度差异的PPs的断裂特征与AFM观察结果一致。

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