TITLE

Determination of absolute polydispersity and molecular weight distribution of high molecular weight polymers from dynamic light scattering

AUTHOR(S)
Jena, Sidhartha S.; Bohidar, Himadri B.
PUB. DATE
July 1993
SOURCE
Journal of Chemical Physics;7/1/1993, Vol. 99 Issue 1, p673
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Intensity correlation function obtained from dynamic light scattering (DLS) experiments has been theoretically analyzed within the framework of the Schulz molecular weight distribution. The correlation function has been expanded about the mean molecular weight instead of the average linewidth as is normally done in cumulant analysis. This allows the explicit determination of polydispersity (Z). In addition to this, it has been shown that the molecular weight exponent of diffusion coefficient ν, occurring in the Mark–Houwink equation DM-ν and the average molecular weight M, can in principle be determined from DLS data. Finally, from the knowledge of Z and M it is possible to construct the Schulz molecular weight distribution function. Experiments performed on three model systems, polystyrene in cyclohexane at 35 °C (θ system), polystyrene in toluene at 20 °C (good system), and latex beads in a deionized aqueous medium (hard spheres system), provide excellent matching between the experimental data and results obtained using our proposed method of analysis of DLS studies.
ACCESSION #
7616493

 

Related Articles

  • The effects of cross-linking on the equation of state of a polymer solution. Horkay, F.; Hecht, A. M.; Geissler, E. // Journal of Chemical Physics;8/15/1989, Vol. 91 Issue 4, p2706 

    Measurements of the swelling pressure ω and shear modulus Gs in a set of poly(vinyl acetate) networks swollen to different degrees in toluene and in acetone are reported, using solutions of the uncross-linked polymer to obtain deswelling under known conditions of osmotic pressure. The...

  • Light scattering in water solutions of fullerene-containing polymers: Part 2. Effect of the molecular weight of the carrier polymer. Sushko, M. L.; Klenin, S. I.; Dumpis, M. A.; Pozdnyakova, L. I.; Piotrovskiı, L. B. // Technical Physics Letters;Oct99, Vol. 25 Issue 10, p778 

    The effect of the molecular mass M[sub PVP] of linear polyvinylpyrrolidone macromolecules on the structures of domains formed in water solutions of PVP/fullerene (C[sub 60]) complexes is investigated. For constant C[sub 60] concentration in a complex, the values of M[sub dom], starting at M[sub...

  • Polymer chain dynamics in dilute solution under Couette flow. II. High molecular weight poly(α-methylstyrene) in good solvent. Tsunashima, Yoshisuke // Journal of Chemical Physics;5/22/2001, Vol. 114 Issue 20 

    Dynamics of poly(α-methylstyrene) of high molecular weight M[sub w]=6.85x10[sup 6] in solution of good solvent was investigated at 25 °C by dynamic light scattering under Couette flow. The applied shear rate was ranging from 0 to 4.5 s[sup -1]. The present purpose was to inspect the...

  • Decoding the Viscoelastic Response of Polydisperse Star/Linear Polymer Blends. Balacca, L.; van Ruymbeke, E.; Coppola, S.; Righi, S.; Vlassopoulos, D. // AIP Conference Proceedings;7/7/2008, Vol. 1027 Issue 1, p418 

    It is well known that polydispersity and branching have important and, at the same time, hardly predictable effects on the rheological and processing properties of industrial polymers. In the literature, many studies have been undertaken in order to predict the rheology of polydisperse linear...

  • Kinetics of chain collapse in dilute polymer solutions: Molecular weight and solvent dependences. Maki, Yasuyuki; Dobashi, Toshiaki; Nakata, Mitsuo // Journal of Chemical Physics;4/7/2007, Vol. 126 Issue 13, p134901 

    The molecular weight and solvent dependences of the characteristic time of chain collapse were studied for poly(methyl methacrylate) (PMMA) of the molecular weight Mw=6.4×106 and 1.14×107 in pure acetonitrile (AcN) and in the mixed solvent of AcN+water (10 vol %). The size of PMMA chains...

  • Concentration and molecular weight regime diagram of salt-free polyelectrolyte solutions as studied by light scattering. Sedlák, Marián; Amis, Eric J. // Journal of Chemical Physics;1/1/1992, Vol. 96 Issue 1, p826 

    Static and dynamic light-scattering measurements were carried out on salt-free aqueous sodium poly(styrene sulfonate) solutions. The concentration dependence of the solution behavior was investigated in the range c=0.01– 45.6 g/L for three samples with Mw=5000, 100 000, and 1 200 000. A...

  • Interpretation of light-scattering spectra in terms of particle displacements. Phillies, George D. J. // Journal of Chemical Physics;6/8/2005, Vol. 122 Issue 22, p224905 

    The article reports on the interpretation of light-scattering spectra in terms of particle displacements. Recently, there has been interest in describing light-scattering spectra in terms of mean-square displacements of the scattering particles. The optical probe method has since been...

  • Light scattering studies to determine molecular weight of freshly prepared Zr(IV) hydrous polymer. Priyadarshini, N.; Sampath, M.; Kumar, Shekhar; Kamachi Mudali, U.; Natarajan, R. // Journal of Radioanalytical & Nuclear Chemistry;Feb2013, Vol. 295 Issue 2, p1093 

    In the present work, Zr(IV) has been taken as a homologue for Pu(IV) in order to study the behaviour of Pu in aqueous systems. The direct detection of polymerization of tetravalent zirconium and determination of molecular weight of freshly prepared Zr(IV) polymer was performed by using dynamic...

  • Polymer induced changes of the crystallization scenario in suspensions of hard sphere like microgel particles. Beyer, Richard; Iacopini, Sara; Palberg, Thomas; Schöpe, Hans Joachim // Journal of Chemical Physics;6/21/2012, Vol. 136 Issue 23, p234906 

    We investigated the crystallization scenario of highly cross linked polystyrene particles dispersed in the good solvent 2-ethylnaphtalene and their mixtures with non-adsorbing low molecular weight polysterene polymer using time resolved static light scattering. The samples were prepared slightly...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics