An Investigation of the Determination of Molecular Weights of High Polymers by Light Scattering

1945 ◽  
Vol 13 (5) ◽  
pp. 159-166 ◽  
Author(s):  
P. M. Doty ◽  
B. H. Zimm ◽  
H. Mark
Keyword(s):  
Light Scattering ◽  
Molecular Weights ◽  
High Polymers

Preparation of graft copolymers by the reaction of polymeric acyl chlorides with monohydroxy-terminated polymers: An introductory study

1988 ◽  
Vol 53 (8) ◽  
pp. 1735-1744 ◽  
Author(s):  
Jitka Horská ◽  
Jaroslav Stejskal ◽  
Pavel Kratochvíl ◽  
Aubrey D. Jenkins ◽  
Eugenia Tsartolia ◽  
...  
Keyword(s):  
Light Scattering ◽  
Chemical Composition ◽  
Statistical Model ◽  
Graft Copolymers ◽  
Coupling Reaction ◽  
Molecular Characteristics ◽  
Gel Formation ◽  
Acyl Chlorides ◽  
Molecular Weights

An attempt was made to prepare well-defined graft copolymers by the coupling reaction between acyl chloride groups located along the backbone chain and monohydroxy-terminated grafts prepared separately. The molecular weights and the parameters of heterogeneity in chemical composition of the products were determined by light scattering and osmometry. The determination of molecular characteristics revealed that the degree of grafting was low. The results therefore could not be confronted with a statistical model at this stage. The problems encountered in the synthesis, e.g., gel formation, and the data relating to the soluble products are discussed.

The Determination of Polymeric Molecular Weights by Light Scattering in Solvent‐Precipitant Systems

1946 ◽  
Vol 14 (11) ◽  
pp. 687-695 ◽  
Author(s):  
R. H. Ewart ◽  
C. P. Roe ◽  
P. Debye ◽  
J. R. McCartney
Keyword(s):  
Light Scattering ◽  
Molecular Weights

Determination of Copolymer Molecular Weight

1968 ◽  
Vol 41 (1) ◽  
pp. 245-253 ◽  
Author(s):  
Paul Rempp ◽  
Henri Benoit
Keyword(s):  
Molecular Weight ◽  
Light Scattering ◽  
Density Gradient ◽  
Compositional Heterogeneity ◽  
Precise Information ◽  
Molecular Weights ◽  
Molecular Weight Distributions ◽  
Weight Distributions ◽  
Binary Copolymers

Abstract From this brief review it appears that determinations of molecular weight averages, of molecular weight distributions, and of compositional inhomogeneity of binary copolymers, require care in the choice of techniques and methods. Some of the most commonly used techniques for molecular weight determinations on homopolymers of various kinds are inadequate for the same determinations on copolymers. Others are more sensitive to fluctuations in composition than in molecular weights. Osmotic methods are the only one which are really insensitive to inhomogeneity, and which yield molecular weights. Ultracentrifugation in a density gradient yields precise information only on fluctuations in composition. Viscosity determinations require calibration, but even so, they may lead to erroneous values of the molecular weight in the case of copolymers. GPC is less sensitive to compositional heterogeneity, but cannot be applied for nonlinear copolymers. Finally, light scattering is a very powerful tool for studies on copolymers, since it leads to molecular weight averages and its helps characterize polydispersity and fluctuations in composition.

Determination of the molecular weights of fractionated polyvinyl acetates by a new type of light-scattering instrument

1952 ◽  
Vol 9 (6) ◽  
pp. 565-574 ◽  
Author(s):  
P. Bosworth ◽  
C. R. Masson ◽  
H. W. Melville ◽  
F. W. Peaker
Keyword(s):  
Light Scattering ◽  
Molecular Weights ◽  
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