等规聚丙烯在形变和加热过程中的结晶和结晶织构
Crystallinity and Crystallographic Texture in Isotactic Polypropylene during Deformation and Heating
摘要：
研究了等规聚丙烯（iPP）在轧制变形和随后的热处理过程中结晶度和结晶取向的发展。实验是用X射线衍射仪和面探测器进行的。通过计算极图和应用定量的3D纹理分量拟合方法来跟踪晶体取向的演变。真实应变为-1.5后的轧制取向主要由（010）[001]、（130）[001]和[001]//RD纤维成分组成（RD：轧制方向）。结果表明，在轧制过程中结晶度急剧下降。我们建议，decomponsization（解聚）是一种变形机制，发生作为一个微观的替代晶体intralamellar剪切取决于层状相对于所施加的变形张量的方向。轧制后的热处理导致非晶材料的再结晶和纤维取向分量的强烈增强。再结晶取向解释的定向成核机制，其中无定形材料沿现有的结晶laminate块，在前面的变形期间占主导地位的对齐。
英文摘要：
The development of the crystallinity and of the crystallographic orientation of isotactic polypropylene (iPP) during rolling deformation and subsequent heat treatment is studied. The experiments are conducted by using X-ray diffraction with an area detector. The evolution of crystallographic orientation is tracked by calculating the pole figures and by applying a quantitative 3D texture component fit method. The rolling orientation after a true strain of -1.5 mainly consists of the (010)[001], (130)[001], and [001]//RD fiber components (RD: rolling direction). The results reveal that the crystallinity drastically decreases during rolling. We suggest that decrystallization (disaggregation) is a deformation mechanism which takes place as a microscopic alternative to crystallographic intralamellar shear depending on the orientation of the lamellae relative to the imposed deformation tensor. Heat treatment after rolling leads to the recrystallization of amorphous material and to a strong enhancement of the fiber orientation component. The recrystallization orientation is explained in terms of an oriented nucleation mechanism where amorphous material aligns along existing crystalline lamellae blocks which prevailed during the preceding deformation.
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