{'fraction_non_alphanumeric': 0.01909307875894988, 'fraction_numerical': 0.00477326968973747, 'mean_word_length': 5.453846153846154, '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}}
Production and Mechanical Properties of Gradient Materials Based on Polyurethanes

Gradient materials are produced on a unit with programmed control of the speed of feeding of material components into a blender. The materials are derived from 2,4-toluene diisocyanate and poly(propylene glycol). A mixture of dimethylbenzylamine and ED-22 epoxy diane resin is used as a catalyst. The structures and properties of the materials obtained are studied using the following methods: titrimetric definition of the NCO groups, measurement of the refractive index during the reaction, analysis of the hardness, the stress–strain curves and the elasticity modulus. Unlike the products obtained previously on a manually controlled unit, the resulting materials exhibit a gradual change of the elasticity modulus from an elastomer to a solid polymer.