A method for determining reactivity ratios when copolymerizations are influenced by the penultimate group effects of both monomers

✍ Scribed by C.A. Barson; D.R. Fenn

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 143 KB
• Volume: 25
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(89)90035-9

✦ Synopsis

A novel kinetic treatment is proposed for the copolymerization of two monomers M~ and M 2 where the reactivities of all terminal groups are susceptible to penultimate group effects. By applying the conditions [Mt]>>[M2] and [MI]<<[M2], as is possible using radiolabelled monomers, values of r I and r 2 respectively can be obtained which are independent of penultimate group effects. These values are then used to find values for the other reactivity ratios r I and r~. The method involves a solution for r' I and r~ by means of intersecting hyperbolas, each curve representing a given monomer feed ratio and copolymer composition ratio. Only one of the two points of intersection of any two hyperbolas is common to all pairs of such curves and provides values for r't and r~.