{'fraction_non_alphanumeric': 0.019538188277087035, 'fraction_numerical': 0.0, 'mean_word_length': 5.0, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 2, '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}}
Mutual diffusion in blends of long and short entangled polymer chains

We have used infrared microdensitometry to study the mutual diffusion across an originally 
sharp interface between two saturated polybutadienes of degrees of polymerization NA and N B (>>Ne, the 
entanglement length) for three different ratios N A / N B . The extent of diffusion broadening suggests that the 
mutual diffusion coefficient is controlled by the mobility of the faster moving (shorter) polymer chains, indicating 
that convective flow may be important in such mixing phenomena.