摘要: As well as being used thermoplastic and thermosetting working materials, fibers, elastomers, polymers are also in very large quantities adhesives coatings. For example, the commercial value of thermoplasts thermosets was 4.5 G$/annum, synthetic 4.0 coatings, 3.5 rubbers, 1.3 adhesives, 1.0 G$/annum United States 1972.