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Synthesis of polyols by anionic polymerization: determination of kinetic parameters of propylene oxide polymerization using caesium and potassium alcoholates
Author(s) -
de Lucas Antonio,
Rodríguez Lourdes,
PérezCollado Mario,
Sánchez Paula,
Rodríguez Juan F
Publication year - 2002
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.909
Subject(s) - polymerization , potassium , caesium , chemistry , bulk polymerization , potassium hydroxide , degree of unsaturation , trimethylolpropane , arrhenius equation , polymer chemistry , materials science , inorganic chemistry , organic chemistry , polyurethane , radical polymerization , polymer , activation energy
CsOH is investigated, as an alternative to the traditionally used KOH, for the preparation of glycerine initiated polyols. CsOH allows polyether–polyols with higher molecular weights and lower unsaturation contents, ie of better quality, to be obtained. CsOH also increases the reaction rate and permits reduction of the time needed to produce a batch of polyol. Polyols were synthesized using caesium and potassium hydroxide at different temperatures and initiator concentrations. Kinetic constants at different temperatures are determined and parameters of the Arrhenius equation calculated for each type of initiator. Reaction rates for caesium are higher than those of potassium and therefore permit a reduction in production times. Copyright © 2002 Society of Chemical Industry