Light Scattering Study of [60] Fullerenol-Based Poly(Urethane-Ether) Star-Shaped Polymers

1994 ◽  
Vol 359 ◽  
Author(s):  
Lee Y. Wang ◽  
Long Y. Chiang
Keyword(s):  
Light Scattering ◽  
Diffusion Coefficients ◽  
Gaussian Model ◽  
Polymer Chains ◽  
Star Polymer ◽  
Dilute Solution ◽  
Analog Model ◽  
Scattering Measurements ◽  
Star Shaped Polymer ◽  
Scattering Study

ABSTRACTThe dynamic behavior of the fullerenol-based polyurethane star-shaped polymer and its analog model stars, containing three or four polymer arms, was investigated in toluene solution by dynamic light scattering measurements. In these systems, the diffusion coefficients clearly showed no angular dependence. In the case of study in dilute solution, all three star polyurethanes were found to possess higher mobility than that of the corresponding linear polyurethane with a similar molecular weight. Furthermore, the conformation of anchoring polymer chains was characterized by the hydrodynamic shrinking factor and compared with the Gaussian model. Results suggested that the polymer arms in the fullerenebased star-polymer were uniformly distributed around the central C60 cage.

Light Scattering Study of Carbon Black Structure

1967 ◽  
Vol 40 (3) ◽  
pp. 919-920
Author(s):  
Jean-Baptiste Donnet ◽  
Claude Eckhardt ◽  
Paul Horn ◽  
Samuel Premilat ◽  
Andries Voet
Keyword(s):  
Mechanical Properties ◽  
Light Scattering ◽  
Carbon Black ◽  
Experimental Method ◽  
Aqueous Dispersions ◽  
Carbon Blacks ◽  
Vulcanized Rubber ◽  
Scattering Measurements ◽  
Scattering Study

Abstract Light scattering measurements on aqueous dispersions of carbon black confirm the hypothesis that mechanical properties of vulcanizates are closely related to structure of the carbon blacks used. This provides a simple experimental method for predicting the influence of a black on vulcanized rubber.

Anionic Polymerization of Isoprene

1965 ◽  
Vol 38 (3) ◽  
pp. 627-635 ◽  
Author(s):  
D. J. Worsfold ◽  
S. Bywater
Keyword(s):  
Light Scattering ◽  
Anionic Polymerization ◽  
Great Increase ◽  
Major Effect ◽  
Dilute Solution ◽  
Initiation Rate ◽  
Kinetic Order ◽  
Scattering Measurements ◽  
Initiation Reaction

Abstract Polymerization of isoprene with butyllithium in cyclohexane has been studied. The initiation reaction was found to be complex; plots of conversion of butyllithium against time are sigmoidal. The order with respect to the initiator was found to be between one-half and one. The order of the isolated propagation reaction in polyisoprenyllithium was found to be one-quarter and was correlated with a fourfold association of active chain ends determined by dilute solution light-scattering measurements. The major effect of tetrahydrofuran on the reaction was the great increase of the initiation rate. The kinetic order changes slowly with the addition of small amounts of tetrahydrofuran, suggesting that the aggregates are broken down with difficulty. The microstructure of the polymer has been determined by NMR measurements and shows a steady transition from a largely 1:4 to a largely 3:4 structure as the polarity of the solvent is increased by the addition of tetrahydrofuran.

Light Scattering Study of Rigid, Rodlike Organometallic Block Copolymer Micelles in Dilute Solution

2005 ◽  
Vol 38 (18) ◽  
pp. 7819-7827 ◽  
Author(s):  
Gérald Guérin ◽  
Jose Raez ◽  
Ian Manners ◽  
Mitchell A. Winnik
Keyword(s):  
Light Scattering ◽  
Block Copolymer ◽  
Dilute Solution ◽  
Scattering Study ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles
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