Modeling of Free Radical Polymerization of Azobenzene-based Linear Polymers

2012 ◽  
Vol 1403 ◽  
Author(s):  
Danish Iqbal ◽  
C. Melchert ◽  
M. Behl ◽  
A. Lendlein ◽  
S. Beuermann
Keyword(s):  
Free Radical ◽  
Radical Polymerization ◽  
Butyl Acrylate ◽  
Software Package ◽  
Kinetic Data ◽  
Liquid Crystalline ◽  
Linear Polymers ◽  
Reasonable Approximation ◽  
Radical Polymerizations ◽  
Remarkable Agreement

ABSTRACTModeling of free radical polymerizations of the liquid-crystalline monomer 6-[4-(4-heptyloxyphenylazo)phenoxy]hexylacrylate using the PREDICI software package is reported. The model accounts for all elemental reactions that were identified to be important for radical polymerizations of acrylate-type monomers. On the basis of butyl acrylate kinetic data a remarkable agreement between number average molar masses from modelling (Mn,sim) and from experiments (Mn,exp) is observed: Mn,sim = 17800 g·mol−1 and Mn,exp = 17400 g·mol−1. Similarly, dispersity values of 1.8 and 1.6 were determined via modelling and experiments, respectively. It is shown that the assumption of butyl acrylate kinetics provides a reasonable approximation even for acrylate-based monomers having mesogenic substituents.

scholarly journals Identification of β scission products from free radical polymerizations of butyl acrylate at high temperature

2019 ◽  
Vol 10 (15) ◽  
pp. 1956-1967 ◽  
Author(s):  
Marco Drache ◽  
Maria Stehle ◽  
Jonas Mätzig ◽  
Katrin Brandl ◽  
Marcel Jungbluth ◽  
...  
Keyword(s):  
High Temperature ◽  
Free Radical ◽  
Radical Polymerization ◽  
Butyl Acrylate ◽  
Molar Mass ◽  
Esi Ms ◽  
Radical Polymerizations

Unsaturated low molar mass species were identified via ESI-MS after fractionation of poly(butyl acrylate) from high temperature radical polymerization.

Evaluating the Effect of Termination by Chain - Chain Coupling in Living Free-Radical Polymerizations

2003 ◽  
Vol 56 (8) ◽  
pp. 775 ◽  
Author(s):  
Jeffrey Pyun ◽  
Ian Rees ◽  
Jean M. J. Fréchet ◽  
Craig J. Hawker
Keyword(s):  
Free Radical ◽  
Star Polymers ◽  
Star Polymer ◽  
Direct Result ◽  
Vinyl Monomers ◽  
Linear Polymers ◽  
Radical Coupling ◽  
Novel Approach ◽  
Vis Spectroscopy ◽  
Radical Polymerizations

A novel approach based on the reaction of multifunctional star polymers with chromophore-labelled linear polymers is presented for evaluating the extent of termination by chain–chain coupling during living free-radical polymerizations. A mixed initiating system consisting of an unlabelled, multifunctional initiator and an excess of a monofunctional alkoxyamine initiator containing a chromophore, such as pyrene, is used to initiate the living polymerization of vinyl monomers leading to a mixture of star and linear polymers. The occurrence of chain–chain coupling is readily identified and quantified by isolating the star polymer that is obtained and elucidating the level of incorporation of pyrene units by UV/vis spectroscopy. This allows the level of chain–chain coupling to be determined since the inclusion of pyrene into the star structure is a direct result of termination by radical coupling.

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