Effect of Polymer Tacticity on the Performance of Poly(N,N-dialkylacrylamide)s as Kinetic Hydrate Inhibitors

2010 ◽  
Vol 24 (4) ◽  
pp. 2554-2562 ◽  
Author(s):  
Luca Del Villano ◽  
Malcolm A. Kelland ◽  
Garret M. Miyake ◽  
Eugene Y.-X. Chen
Keyword(s):  
Polymer Tacticity

PROTON MAGNETIC RESONANCE LINE WIDTH AS A FUNCTION OF POLYMER TACTICITY

1966 ◽  
Vol 44 (2) ◽  
pp. 153-156 ◽  
Author(s):  
S. Brownstein ◽  
D. M. Wiles
Keyword(s):  
Magnetic Resonance ◽  
Methyl Methacrylate ◽  
Proton Magnetic Resonance ◽  
Chloroform Solution ◽  
Spin Coupling ◽  
Solution Viscosity ◽  
Dilute Solution ◽  
Poly Methyl Methacrylate ◽  
Resonance Line Width ◽  
Polymer Tacticity

The high resolution proton magnetic resonance spectra of five samples of poly(methyl methacrylate) in chloroform solution have been measured with 100 Mc/s equipment. The widths of the absorption lines arising from the protons of the α-methyl and the methoxyl groups have been compared. The widths are greater when the polymer is predominantly syndiotactic than when it is predominantly isotactic. It is concluded that isotactic samples have the more extended conformation in chloroform solution. An analogy with dilute solution viscosity measurements is outlined in support of this conclusion. Differences between the widths of the lines of the methylene protons in a completely isotactic poly(methyl methacrylate) sample are attributed to long range spin coupling.

Elucidation of Polymer Microstructure by High Resolution NMR Spectroscopy

1967 ◽  
Vol 40 (2) ◽  
pp. 385-399 ◽  
Author(s):  
Raymond C. Ferguson
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
Spectral Data ◽  
High Field ◽  
Structural Features ◽  
Polymer Microstructure ◽  
Structural Isomerism ◽  
High Resolution Nmr ◽  
Polymer Tacticity

Abstract High resolution NMR spectroscopy is proving to be a useful experimental technique for determining the microstructures of high polymers. Its major utility, aside from identifying structural features often not detectable by other methods, lies in quantitative applications. Some examples are the determination of monomer ratios in copolymers, polymer tacticity, sequence isomerism of monomer units, and other types of structural isomerism. The applicability of the method is being enhanced by continuing development of high-field spectrometers, special accessories, and new experimental techniques, and by application of computers to the analysis of spectral data.

Spectroscopic evidence of the polymer tacticity as an important parameter for the configuration of the adsorbed pmma layer

1997 ◽  
Vol 119 (1) ◽  
pp. 165-171
Author(s):  
Yves Grohens ◽  
Maurice Brogly ◽  
Clorinthe Labbe ◽  
Jacques Schultz ◽  
Robert E. Prud'homme
Keyword(s):  
Pmma Layer ◽  
Spectroscopic Evidence ◽  
Polymer Tacticity

Computer Simulation of Vinyl Polymer Tacticity

1995 ◽  
Vol 72 (2) ◽  
pp. 133 ◽  
Author(s):  
T. Radiotis ◽  
G. R. Brown
Keyword(s):  
Computer Simulation ◽  
Vinyl Polymer ◽  
Polymer Tacticity

Fourier Self-Deconvolved Infrared Spectra as an Aid to Conformational Studies on Poly(Vinyl Chloride)

1986 ◽  
Vol 40 (2) ◽  
pp. 239-245 ◽  
Author(s):  
David A. C. Compton ◽  
William F. Maddams
Keyword(s):  
Vinyl Chloride ◽  
Infrared Spectra ◽  
Curve Fitting ◽  
Conformational Structure ◽  
Conformational Studies ◽  
Peak Finding ◽  
Poly Vinyl Chloride ◽  
Three Samples ◽  
Polymer Tacticity ◽  
Overlapping Bands

Fourier self-deconvolution has been used to enhance the detail present in the carbon-chlorine stretching region of the infrared spectra of three samples of polyvinyl chloride) covering a range of syndiotacticities. The results are of interest both as a good example of the scope and limitations of Fourier self-deconvolution and because they complement the information on the conformational structure of these polymers obtained previously by other peak-finding methods. In the former context, the results show that the use of varying degrees of over-deconvolution is advantageous in dealing with systems of overlapping bands having a range of half widths. With respect to the conformational structure of poly(vinyl chloride), the most significant conclusion is that the frequency of the B1 mode of long syndiotactic sequences is dependent on both polymer tacticity and the form in which the sample is examined. The implications of this finding for the use of curve fitting are discussed briefly.

Catalyst Structure and Polymer Tacticity

2007 ◽  
pp. 169-200 ◽  
Author(s):  
Anthony Rappé ◽  
Lynn Bormann-Rochotte ◽  
Oleg Polyakov
Keyword(s):  
Catalyst Structure ◽  
Polymer Tacticity
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