Effect of temperature and solvent on polymer tacticity in the free-radical polymerization of styrene and methyl methacrylate

2013 ◽  
Vol 51 (16) ◽  
pp. 3351-3358 ◽  
Author(s):  
Leesa M. Smith ◽  
Michelle L. Coote
Keyword(s):  
Free Radical ◽  
Methyl Methacrylate ◽  
Radical Polymerization ◽  
Free Radical Polymerization ◽  
Effect Of Temperature ◽  
Polymer Tacticity

scholarly journals Effect of temperature on initial stage of methyl methacrylate free radical bulk polymerization

2010 ◽  
Vol 64 (6) ◽  
pp. 503-510
Author(s):  
Vladislav Jaso ◽  
Dragoslav Stoiljkovic ◽  
Radmila Radicevic
Keyword(s):  
Experimental Data ◽  
Free Radical ◽  
Methyl Methacrylate ◽  
Radical Polymerization ◽  
Free Radical Polymerization ◽  
Bulk Polymerization ◽  
Effect Of Temperature ◽  
Scanning Calorimetry ◽  
Initial Stage ◽  
Classic Theory

Classic theory of free radical polymerization is based on two assumptions. The first is that the concentration of initiator is slightly changed and could be taken as a constant value. The second assumption is that the rate of initiation is equal to the rate of termination. Equation for the polymerization rate based on these assumptions can not successfully describe the initial stage of free radical polymerization. In order to solve this problem, three mathematical models were developed and used to verify of the mentioned assumptions. The models were fitted to experimental data and qualities of their fits were compared. Experimental data of isothermal bulk polymerization of methyl methacrylate were obtained by differential scanning calorimetry at 60, 70, 80 and 90?C with initiator concentration (AIBN) of 0.5 wt%. The best fit was shown by the model that assumes constant concentration of initiator during initial stage but takes into account that the rate of initiation is not equal to the rate of termination at the beginning.

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