Abstract
It seems that the knowledge of the morphologies of chain-folded lamellae structure in the bulk crystalline polymers is limited, however, in industry, is out of necessary to understand increasing mechanical properties. Why had not TEM investigations been advanced? In this answer, two reasons can be thought as follows; 1) Misfit between wide length scales of crystalline polymer, which is classified 3 scales; unit cell (subnanometer), chain-folded lamellae (thickness: 10 nm, lateral dimensions: several um), and finally, spherulites (from μm to mm), and the penetration power of convergent TEM. 2) The lamellae structures in a TEM image are only that of edge-on type in the specimen because of 2D projection principle.
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Matsumoto, H., Song, M., Sano, H., Shimojo, M., Furuya, K. (2008). A study of the chain-folded lamellae structure and its array in the isotactic polypropylene spherulites by HAADF-STEM and HV-TEM Tomography techniques. In: Richter, S., Schwedt, A. (eds) EMC 2008 14th European Microscopy Congress 1–5 September 2008, Aachen, Germany. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85226-1_388
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