Bepaling van Aantalgemiddeld Molecuulgewicht en Heterogeniteitsindex Via Diffusie‐Experimenten

Peeters, F. A. H.; Soeteman, A. A.

doi:10.1002/bscb.19810901002

Bulletin des Soc Chimique

1981

DOI: 10.1002/bscb.19810901002

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Bepaling van Aantalgemiddeld Molecuulgewicht en Heterogeniteitsindex Via Diffusie‐Experimenten

F. A. H. Peeters

A. A. Soeteman

Abstract: The determination of averages of diffusion coefficients and among others, from them, the number‐average molecular weight, becomes possible after reformulation of Sundelöf's method of processing of free diffusion data. An index of heterogeneity may be calculated too.

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1982

1983

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Diffusie‐, Visceus en GPC‐Gedrag van Dextranen in Water als Functie van Hun Molecuulgewicht

Soeteman

Peeters

1982

Bulletin des Soc Chimique

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SAMENVATT I NGEen a a n t a l dextranen (Pharmacia) met bekende molecuulgewichten M gedraagt z i c h , b l i j k e n s een gecombineerd v i s c o s i m e t r i e -en GPC-onderzoek aan oplossingen i n water (30 O C ) , a l s een homologe reeks, ook opzichtens vertakking, met welbepaalde GPC-ijkfuncties betrokken op M dan we1 h e r v i s c o s i t e i t s g e t a l [I)]. U i t deze f u n c t i e s werd een V O O K d i s p e r s i e gecorrigeerde Mark-Houwinkbetrekking a f g e l e i d : [I)] = 7,53. 10-2*M0~523 (ml/g) voor l o 4 5 M 5 l o 5 ; i n h e t hoogmoleculaire geb i e d d a a l t de exponent t o t 0 , 3 4 . Verwerking van k l a s s i e k e d i f f u s i e m e t i n g e n , volgens SundelEf, maakt bepaling e n e r reeks diffusieco6fficigntgemiddelden Bp, p > -1, u i t de d e v i a t i e f u n c t i e mogel i j k , n a a s t de gereduceerde oppervlakte-hoogteverhouding DA. Langs numerieke weg kan m e t hen, de chromatogramen en de i ' k f u n c t i e op M een voor d i s p e r s i e gecorrigeerd D,M-verband a f g e l e i d worden: D = 8 , 8 4 . 1 0 -~. M -~* '~~ (cm2/s) voor l o 4 < M < lo5. Beschikbaarheid van aantalgemiddelde Mwaarden maakt d e s z e l f s o p s t e l l i n g mogelijk b -4, from the devi a t i o n f u n c t i o n , and, moreover, of t h e reduced height-area r a t i o DA , Using the chromatograms, the M-based c a l i b r a t i o n curve and t h e s e D-averages, we c o r r e c t e d t h e D,M-relation f o r d i s p e r si o n : D = 8 . 8 4 . 1 0 -~. K~*~' 6 ( c m 2 / s ) , f o r lo4 5 M 5 lo5. With t h e number-averaged M v a l u e s a t o n e ' s d i s p o s a l , the use of GPC may be circumvented i n t h e c a l c u l a t i o n of the r e l a t i o n . From t h i s and the d e v i a t i o n f u n c t i o n s e v e r a l averages of M r e s u l t e d , being reasonably i n accordance w i t h t h e GPC values. The r a t i o of r a d i i , r,.,/yf, c a l c u l a t e d from M, very c l o s e...

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Diffusie‐, Visceus en GPC‐Gedrag van Dextranen in Water als Functie van Hun Molecuulgewicht

Soeteman

Peeters

1982

Bulletin des Soc Chimique

Self Cite

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Effects of molecular heterogeneity on physical properties of polymers

Staverman¹

1983

European Polymer Journal

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Bepaling van Aantalgemiddeld Molecuulgewicht en Heterogeniteitsindex Via Diffusie‐Experimenten

Abstract: The determination of averages of diffusion coefficients and among others, from them, the number‐average molecular weight, becomes possible after reformulation of Sundelöf's method of processing of free diffusion data. An index of heterogeneity may be calculated too.

Cited by 2 publications

References 0 publications

Diffusie‐, Visceus en GPC‐Gedrag van Dextranen in Water als Functie van Hun Molecuulgewicht

Diffusie‐, Visceus en GPC‐Gedrag van Dextranen in Water als Functie van Hun Molecuulgewicht

Effects of molecular heterogeneity on physical properties of polymers

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