Premium
Predicting Average Molecular Weights and Branching Level for Self‐Condensing Vinyl Copolymerization in a CSTR
Author(s) -
Buren Bradley D.,
Zhao Yutian R.,
Puskas Judit E.,
McAuley Kimberley B.
Publication year - 2018
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.201700074
Subject(s) - continuous stirred tank reactor , branching (polymer chemistry) , polymer chemistry , dispersity , residence time (fluid dynamics) , isobutylene , chemistry , copolymer , thermodynamics , materials science , chemical engineering , polymer , organic chemistry , physics , geotechnical engineering , engineering
Abstract A continuous stirred‐tank reactor (CSTR) model is developed to produce arborescent polyisobutylene via carbocationic copolymerization of isobutylene and inimer using multidimensional method of moments. The model is used to predict dynamic changes in average branching level ( B kin ) and number‐average and weight‐average molecular weights (M ¯ n and M ¯ w ). Simulations of this self‐condensing vinyl copolymerization (SCVCP) show a tendency toward higher polydispersity and higher B kin compared to batch reactor simulations conducted using the same recipes and residence times. At high inimer feed concentration and/or long residence time, the model predicts that a CSTR does not reach steady‐state operation due toM ¯ wincreasing toward infinity. There is a narrow operating range in which inimer feed concentrations can be adjusted to achieve a desired steady‐stateM ¯ w . If SCVCP is to be conducted in a CSTR, it will be important to ensure that residence times and inimer feed concentrations are selected within the stable operating window.