Premium
Determination of the entanglement molecular weight of thermoplastic elastomers by tensile retraction measurements
Author(s) -
Hergenrother William L.,
Doshak John M.
Publication year - 1990
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.1990.070400531
Subject(s) - polybutadiene , materials science , ultimate tensile strength , extrapolation , quantum entanglement , elastomer , thermoplastic elastomer , elongation , rubber elasticity , elasticity (physics) , composite material , polymer chemistry , natural rubber , thermodynamics , polymer , copolymer , mathematics , physics , mathematical analysis , quantum mechanics , quantum
The molecular weight between crosslinks was measured as a function of the maximum extension to which samples of solution cast films of ABA triblocks were tested. These measurements were done by applying the kinetic theory of rubber elasticity to the retraction portion of a tensile hysteresis curve. The molecular weight between chain restrictions, as determined by extrapolation to 0% elongation, was found to be identical to the entanglement molecular weight normally associated with the polybutadiene or polyisoprene that was used for the center block. The disentanglement of the small amount of AB diblock present could also be followed by fitting the data collected to what could be pictured kinetically as a simultaneous first‐and second‐order loss of crosslink density.