Size Exclusion Chromatography: Methodology and by Theodore Provder

By Theodore Provder

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Experimental data computed curves. The computed curves with τ = 6 ( ), ( ) and τ = 12 ( - . - . - ) . n 9 Ό - 1 x Figure 6. E f f e c t o f Pe values on model p r e d i c t i o n s . 423. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1984. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1984. 2. 20. 2. In the r e a l s i t u a t i o n i t should approach the t r u e MWD o f the polymer being analysed. As α decre­ ases the simulated peak i s f i r s t broadened and then skewed.

KIM AND JOHNSON Computer Model for GPC of Polymers 33 In Equation 24, τ i s the t o r t u o s i t y , a term w e l l e s t a b l i s h e d f o r gas d i f f u s i o n i n t o porous m a t e r i a l s (10). I t i s unfortunate, but necessary to introduce τ i n t o our model. The value o f τ can­ not be obtained a - p r i o r i and must be obtained experimentally s i n c e i t i s an almost impossible task t o d e s c r i b e the complicated pore geometry i n a g e l . Given i d e a l i s e d p e r f e c t pore geometry i t has been p o s s i b l e t o estimate τ f o r gas d i f f u s i o n processes.

A. Burcyzk with GPC measurements and Mr. S. Lee f o r the drawing o f the f i g ­ ures. Glossary α a Dax L . D / u . ; ACS Symposium Series; American Chemical Society: Washington, DC, 1984. Sc 2/3/6 Colburn mass t r a n s f e r j f a c t o r Κ Mark-Houwink-Sakurada constant Kf Mass t r a n s f e r c o e f f i c i e n t around g e l K F r a c t i o n a l r e d u c t i o n i n d i f f u s i v i t y w i t h i n g e l pores r e s u l t i n g from f r i c t i o n a l e f f e c t s K Q Solute d i s t r i b u t i o n c o e f f i c i e n t μ Solvent v i s c o s i t y μ nth c e n t r a l moment μ Peak skewness Μμ n t h l e a d i n g moment MyV i s c o s i t y average molecular weight Ν Number o f t h e o r e t i c a l p l a t e s Pe = L .

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