ma961015d_si_001.pdf (184.59 kB)
Poly(p-phenylene sulfide) Synthesis: A Step-Growth Polymerization with Unequal Step Reactivity
journal contribution
posted on 1997-02-10, 00:00 authored by Darryl R. Fahey, Harvey D. Hensley, Carlton E. Ash, Dwayne R. SennThe anomalous responses of Mw to conversion
and to comonomer stoichiometry, i.e.,
deviations from expected classic A−A + B−B step-growth
polycondensation behavior, observed in poly(p-phenylene sulfide) synthesis from
p-dichlorobenzene and sodium sulfide are shown to be a
consequence
of unequal rate constants for the growth steps. The polymerization
is simulated by a computer model
based on the step-growth polymerization concept and includes
cyclization and side reactions. Rate
constants and activation energies for the growth and side reactions
were obtained by measurements of
reaction rates of actual reaction intermediates or model compounds,
while those for cyclizations were
estimated.