{'fraction_non_alphanumeric': 0.017959183673469388, 'fraction_numerical': 0.010612244897959184, 'mean_word_length': 5.319587628865979, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Rheo-Optical Studies of High Polymers. XXI. The Deformation Process and Crystal Transformation in Polybutene-1

The crystal transformation from modification 2 to modification 1 in unstrained polybutene-1 films was observed by the infrared absorption and refractive index methods. The crystal transformation and orientation during stress-strain measurements were also observed by means of the infrared dichroism method developed by us. The crystal transformation in a fresh sample begins at about 30 min after the sample preparation, and the degree of transformation increases with increasing time until it reaches about 0.9 at 50 hr and 1.0 about 3 weeks after the sample preparation. The rate of crystal transformation could be expressed by an equation of the same form as that for the one-dimensional crystallization rate.Stress-strain curves, degree of crystal transformation vs. strain curves as well as infrared dichroic ratio vs. strain curves for film specimens having different initial degrees of crystal transformation differ remarkably. On the basis of these experimental results, the deformation and crystal transformation processes during stree-strain measurements under constant rate of elongation are discussed.