Graessley

Taylor-Maranas J K, Debenedetti P G, Graessley W W and Kumar S K 1997 Compressibility effeots in neutron soattering by polymer blends Macromolecules 30 6943... 

Graessley W W 1993 Viscoelasticity and flow in polymer melts and concentrated solutions Physical Properties of Polymers ed J E Mark et al (Washington, DC ACS) pp 97- 143... 

Figure 2.15 Log of viscosity enhancement factor versus parameter measuring branch length for polyisoprene, [Data from W. W. Graessley, T. Masuda, J. E. I. Roovers, and N. Hadjichristidis, Afacromo/ecu/ej 9 127 (1976).]...

The bulk viscosity of polystyrene (M = 371,000) at 200°C was measured by Graessley and Segalt at different rates of shear. At low rates of shear Tjj = 330,000 P and drops off with 7 approximately as follows ... 

The Newtonian viscosities of polystyrene samples were measured at 183 C and the following results were reported by Graessley and Segal ... 

W. W. Graessley. Viscoelstic properties of entangled flexible polymers. Faraday Symp Chem Soc 18 1-21, 1983. 

Graessley, W. W. Entagled Linear, Branched and Network Polymer Systems. Molecular Theories. Vol. 47, pp. 67—117. 

Graessley J.H. Zufall, Fifth Quarterly Progress Report On Fission Product Applications Using Gaseous Beta Sources , USAEC Contract AT(30-l)-2343, Task II, Air Redn Co, Murray Hill, NJ (I960) 6)J.H. Wotiz, et al, A Novel... 

The empirical frictional factor (T fric) is independent of shear rate but increases in poor solvent this permits to account for the dependence of the scission rate constant on solvent quality. The entanglement part (r enl), as given by Graessley s theory which considers the effect of entanglement and disentanglement processes, is a complex function of shear rate ... 

The bracket (1 — 2/f) was introduced into the theory of rubber elasticity by Graessley [23], following an idea of Duiser and Staverman [28]. Graessley discussed the statistical mechanics of random coil networks, which he had divided into an ensemble of micronetworks. 

Pearson D.S. and Graessley W.W., Elastic properties of well characterized ethylene propylene copol3Tner network. Macromolecules, 13, 1001, 1980. 

Lohse, D.J., Gamer, R.T., Graessley, W.W., and Krishnamoorti, R. Miscibility of Blends of Saturated Hydrocarbon Elastomers. Rubber Division, the American Chemical Society, Nashville, Tennessee, Sept. 29-Oct. 2, 1998, Paper No. 33, 1-14. 

Mark JE, Eisemberg A, Graessley WW, Mandelkern L, Samulski ET, Koenig JL,Wignal GD (1993) Physical properties of polymers. American Chemical Society, Washington DC... 

In order to estimate the branching factor e for polyvinyl acetate we have analyzed the SEC data obtained on sample PVAc-E4 using the MWBD method with various e values. This sample was synthesized under kinetically controlled conditions (isothermal, T = 60°C, [AIBN] = 10"5 g-mole/1, conversion level of 48.5 percent). The SEC measurements were made at 25°C in tetrahydro-furan. The Mark-Houwink coefficients used for linear polyvinyl acetate are those suggested by Graessley (21), namely K = 5.1 x 10"5 dl/gm and a = 0.791. The whole polymer M, Mj, and B j values obtained are listed in Table II. 

The MWBD method also requires an independent measure of the branching structure factor e. For our analysfs of polyvinyl acetate, it was obtained by comparing M and Bf values calculated from SEC data, analyz d using the MWBD method and various epsilons, and the Mfj and Bj values predicted by Graessley s (21) kinetic model. An epsilon value of 1.0 was found to fit best. 

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