Author
Elizabeth Cohn-Ginsberg
Bio: Elizabeth Cohn-Ginsberg is an academic researcher from Rohm and Haas. The author has contributed to research in topics: Theta solvent & Methacrylate. The author has an hindex of 5, co-authored 5 publications receiving 186 citations.
Papers
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TL;DR: Light scattering determinations of molecular weight and coil size made at room temperature with three different cells at two wavelengths of incident light and in two solvents (acetone and acetonitrile) on fourteen fractions and six whole polymers of polymethyl methacrylate ranging in molecular weight from 2.7 × 103 to 2.5 × 106 provide a basis for estimation of the validity and reliability of such measurements as mentioned in this paper.
92 citations
40 citations
TL;DR: In this paper, the intrinsic viscosities in both solvents were obtained on fractions of isotactic polymethyl methacrylate having M w &-M n ≈ 1·4.
24 citations
17 citations
13 citations
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TL;DR: The results of an extensive study of the intrinsic viscosity [η] of a series of linear, homogeneous (anionically prepared) polystyrenes (1.9 ∼ 106.
Abstract: The results of an extensive study of the intrinsic viscosity [η] of a series of linear, homogeneous (anionically prepared) polystyrenes (1.9 ∼106. Above this molecular weight the dependence of [η]/[η]0 on z is satisfactorily predicted by recent calculations of Fixman; [η]/[η]0 is not linear in z contrary to other recent suggestions. The failure of the data on lower molecular weight polymers to be a single‐valued function of z is discussed in terms of partial draining effects.
184 citations
22 Feb 1999
137 citations
TL;DR: The chain length dependence of mean-square radius of gyration ‹S2› for several polymers, stiff or flexible, in dilute solution is compared with that for the Kratky–Porod (KP) wormlike chain, using representative literature data.
Abstract: The chain length dependence of mean-square radius of gyration ‹S2› for several polymers, stiff or flexible, in dilute solution is compared with that for the Kratky–Porod (KP) wormlike chain, using representative literature data. In the region of nK, the number of Kuhn’s statistical segments, below about 50, ‹S2› for all polymers examined is accurately described by Benoit–Doty’s expression for the KP chain. Upward deviations from this expression occur at nK of about 50, regardless of the chain stiffness. Thus, the critical chain length Lc for the onset of excluded-volume effect on the average dimensions of a polymer is approximately proportional to q, the persistence length of the polymer, with a proportionality factor of about 100. The value of Lc estimated from this relation is at least one order of magnitude larger than that predicted theoretically by Yamakawa and Stockmayer.
114 citations
TL;DR: In this article, the unperturbed dimensions of polymer molecules can be estimated from a knowledge of the frictional coefficients in any given solvent using a graphical procedure based on the simple relation [F]=K f M 1 2 + 0·201 P 0 BA −2 M which is similar to an equation developed by Stockmayer and Fixman relating intrinsic viscosity and molecular weight.
102 citations
TL;DR: New neutral nickel(II) complexes bearing asymmetric β-ketoiminato (N,O) ligands (5a−c), [(2,6-iPr2C6H3)NC(R2)C(H)C1)O]Ni(Ph)(PPh3), have been synthesized as discussed by the authors.
94 citations