{'fraction_non_alphanumeric': 0.026558891454965358, 'fraction_numerical': 0.021939953810623556, 'mean_word_length': 5.062937062937063, '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}}
Nuclear Magnetic and Mechanical Relaxations in the γ-Loss Band of Linear Polyethylene Irradiation with γ-Rays

Molecular motion and relaxation processes in the solution-crystallized linear polyethylene irradiated with γ-rays to 100, 200 and 400 Mrad in air are investigated in the temperature range from ca. –170 to –10°C (γ-region) by means of broad-line nuclear magnetic resonance absorption and dynamic mechanical measurements. Of the three relaxations γ1, γ2 and γ3 appearing in this region the γ3-relaxation, attributed to the motion of ciliary chains on the lamellar surface, becomes predominant as the amount of irradiation increases. It is suggested that carboxylic end groups are introduced into the ciliary chains produced by oxidative chain scission, because the values of the NMR second moment in the γ-region agree with those of the HNO3-treated sample.