ma9b02721_si_001.pdf (774.99 kB)
Mechanochemical Degradation of Brush Polymers: Kinetics of Ultrasound-Induced Backbone and Arm Scission
journal contribution
posted on 2020-02-24, 16:00 authored by Gregory I. Peterson, Jinkyung Noh, Ki-Taek Bang, Hyunji Ma, Kyoung Taek Kim, Tae-Lim ChoiThe
ultrasonic degradation of polynorbornene-g-polylactide
and polynorbornene-g-polystyrene brush
polymers was explored. First-order rate constants for backbone scission
were obtained for brush polymers with varying arm lengths (ranging
ca. 3–8 kDa) and backbone degrees of polymerization (ranging
ca. 78–361). Master curves, in which the rate constant trends
for all polymers converge, could be generated by accounting for the
rate enhancement from the polymer being in an extended conformation
and the contour length being equivalent to the combined length of
two arms and the backbone. Slow scission of arms from the backbone
was also observed, with first-order rate constants being dependent
on the arm length.