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Kinetic analysis of the autohesion of raw SBR samples
Author(s) -
Baumbach D. O.
Publication year - 1967
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.1967.070110914
Subject(s) - raw material , kinetic energy , annealing (glass) , materials science , emulsion , kinetics , bond strength , composite material , thermodynamics , chemistry , chemical engineering , analytical chemistry (journal) , chromatography , organic chemistry , layer (electronics) , adhesive , physics , quantum mechanics , engineering
A kinetic analysis of the autohesion of raw, cold, emulsion SBR rubbers having number‐average molecular weights ranging from 74,000 to 169,000 was undertaken by using the modified Wallace tackmeter. The autohesion was observed to be a reversible process following first‐order kinetics with respect to the formation of elementary area bonds. The application of greater contact pressures during autohesion increase in the kinetic work, bond strength, and time required for bond rupture. A practical aspect of the study shows that the contact time necessary to form a complete area bond is reduced by: ( 1 ) the annealing of samples to release internal stresses; ( 2 ) production of clean and very smooth surfaces; ( 3 ) equilibrating samples under pressure prior to joining them; ( 4 ) lowering the sample temperature. The raw SBR offering the best potential autohesive properties has a M n of 133,000 and ML‐4 (212°F.) of 66.