ma7b01655_si_001.pdf (1.03 MB)
Synthesis of Polyisobutylene Bottlebrush Polymers via Ring-Opening Metathesis Polymerization
journal contribution
posted on 2017-09-19, 00:00 authored by Bin Yang, Brooks A. Abel, Charles L. McCormick, Robson F. StoreyPolyisobutylene
(PIB)-based bottlebrush polymers were synthesized
via ring-opening metathesis polymerization (ROMP) of norbornene- and
oxanorbornene-terminated PIB macromonomers (MM) initiated by Grubbs
third-generation catalyst ((H2IMes2)(pyr)2(Cl)2RuCHPh) (G3). While both MMs reached
greater than 97% conversion as measured by 1H NMR, the
rate of propagation of PIB norbornene was measured to be 2.9 times
greater than that of PIB oxanorbornene MMs of similar molecular weight
(MW). The slower rate of propagation of the oxanorbornene MM was attributed
to interaction between the electron-rich oxygen bridge and the metal
center of G3, which slowed but did not inhibit polymerization. Both
types of MMs demonstrated controlled/“living” polymerization
behavior, and brush polymers with MWs up to ∼700 kg/mol with
narrow dispersity (Đ ≤ 1.04) were achieved.
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electron-rich oxygen bridgebrush polymersPolyisobutylene Bottlebrush PolymersROMPPIB norbornene2.9 times1 H NMRRing-Opening Metathesis Polymerization PolyisobutylenePIB oxanorbornene MMsmetal centerring-opening metathesis polymerizationoxanorbornene-terminated PIB macromonomersoxanorbornene MMpropagationMW
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