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Unusual film‐forming properties of aromatic heterocyclic ladder polymers
Author(s) -
Arnold F. E.,
Van Deusen R. L.
Publication year - 1971
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1971.070150820
Subject(s) - polymer , ultimate tensile strength , materials science , methanesulfonic acid , casting , boiling , composite material , arylene , polymer chemistry , chemical engineering , organic chemistry , chemistry , alkyl , aryl , engineering
A new method of obtaining films of aromatic heterocyclic ladder polymers has been found which circumvents casting from high‐boiling acidic solvents. The BBL ladder polymer has been formed into tough, durable films by collecting suspensions of the polymer obtained from acid reprecipitations upon a fritted glass funnel. After drying, the polymer can be removed as film, with thickness dependent upon the amount of material used. Such a film has a tensile strength of 9,600 lb/in. 2 as compared to a tensile strength of 16,000 lb/in. 2 obtained from the same polymer when cast from methanesulfonic acid solution.