Abstract
Thin films of natural rubber (NR) or polychloroprene (CR) were made by casting a 1.0—2.0 wt% solution in n-hexane or benzene onto the water surface, and were prestretched up to a fairly large amount of strain (500—800%) at an ambient temperature in wintertime. Each of the specimens thus prepared was introduced into a transmission electron microscope (TEM) column with a cryo-transfer specimen-holder and examined by TEM observation without any electron staining. Most of the specimens were isothermally crystallized for 1—2h inside the TEM column by using the holder before TEM observation: at −25°C for NR and at −5°C for CR. On the basis of the morphological observations in bright- and dark-field imaging modes and the selected-area electron diffraction analysis, the identity of the “γ-filaments”, which were named by Andrews (Proc. Roy. Soc. A., 277, 562 (1964)), and the crystallization mechanism in highly prestretched NR and CR were discussed.
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Tsuji, M., Shimizu, T. & Kohjiya, S. TEM Studies on Thin Films of Natural Rubber and Polychloroprene Crystallized under Molecular Orientation II. Highly Prestretched Thin Films. Polym J 32, 505–512 (2000). https://doi.org/10.1295/polymj.32.505
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DOI: https://doi.org/10.1295/polymj.32.505
