Cross‐linking reaction in butadiene polymerization

Kinetic Studies of a Redox Polymerization

“…T h e fact t h a t this is a temperature effect o n t h e a m o u n t of cross-linking suggests t h a t t h e r a t e o f crosslinking relative to t h e r a t e of propagation is decreased with lowering temperature, i.e., t h e cross-linking reaction h a s a higher activation energy t h a n t h e propagation reaction. Morton a n d Salatiello h a v e observed a similar depenclence of gel point o n polymerization temperature in t h e polymerization of butadiene in a &Iutual recipe system (17). T h e q u a n t i t a t i v e t r e a t m e n t applied by these workers c a n n o t b e extended t o this redox system because o f a mixed n a t~l r e of t h e terminating processes operating.…”

Molecular weight distribution in nonlinear emulsion polymerization

“…P (1) and P(2) whose chain lengths are r 1 and r 2 , respectively. In this case, a radical will choose The idea behind eq.…”

“…9 -12,14,15 Especially, because the ization locus is semidilute or concentrated, which weight-average molecular weight is highly sensiresults in a larger probability of branch chain fortive to the high molecular weight tail of the distrimation. [1][2][3][4][5] This effect was shown to contribute to bution, it can be affected significantly. The detera unique nonlinear structure development in ministic models 4,5,16,17 developed so far for nonlinemulsion polymerization, i.e., the developments ear emulsion polymerization fail to account for of both the average [1][2][3][4][5][6][7][8][9][10][11][12] and distribution 6-12 of the this limited space effect.…”

“…[1][2][3][4][5] This effect was shown to contribute to bution, it can be affected significantly. The detera unique nonlinear structure development in ministic models 4,5,16,17 developed so far for nonlinemulsion polymerization, i.e., the developments ear emulsion polymerization fail to account for of both the average [1][2][3][4][5][6][7][8][9][10][11][12] and distribution 6-12 of the this limited space effect. In fact, these models predict that the second order moment of the MWD density of polymer is 1 g/cm 3 , a polymer particle In crosslinking emulsion polymerizations, the reason for obtaining smaller molecular weights with diameter 0.1 mm contains about 3 1 10 6 monomeric units.…”

Emulsion Polymerization of Chloroprene. Polymerization Mechanism and Evaluation of Crosslinking Density

“…Morton and Salatiello 14 have studied the emulsion polymerization of butadiene and indirectly determined the magnitude of K from gel point, chain transfer reagent concentration and polymerization rate data.…”