Finings intrinsic viscosity

The molecular size of the soluble component of finings can be assessed by measuring the so-called intrinsic viscosity [5]. 

Because viscosity is an important parameter for the deposition velocity of fine-particle slurries, and because the viscosity of water may increase substantially with the concentration of fine particles, it is important that the viscosity of the carrier mixture (water + fines) be measured. Unfortimately this has not always been done. An indication of the importance of measurement is given from the fact that the intrinsic viscosity [(p/pO - l]/Cfi,Ks for water containing fine particles may often be as high as 30 whereas the value for deflocculated spheres is only 2.5. Particles of diameter fine enough to flocculate are often present in the original slurry and large quantities of fines may be generated by repeated recirculation of a slurry in small diameter test loops. 

I admired Staudinger s fine researches in the polymer field, but I could not accept his claim that the Staudinger Law" — proportionality between intrinsic viscosity and molecular weight — could be explained on the assumption of rodlike chain molecules. 

One of the main limitations of intrinsically conductive polymers (ICP s) towards their wide application as conductive additives for thermoplastics is their poor thermal-oxidative stability at typical melt processing temperatures (i.e., above 200 °C). On the other hand, the use of high surface area carbon blacks (CB) as conductive additives is limited due to the increased melt viscosity of their blends with thermoplastics. Eeonomers are a new class of thermally stable, chemically neutral, and electrically conductive composites made via in-situ deposition of conductive polyaniline (PANI) or polypyrrole (PPY) on CB substrates. Eeonomer composites are more stable (up to 300 °C) than pure ICP s and more easily processible with thermoplastics than CB. Use of Eeonomers as conductive additives for plastics lead to compounds with improved electrical, mechanical, and processing properties. By varying Ae conductive polymer to CB ratio, it is possible to fine tune the polarity of Eeonomer composites and achieve very low percolation thresholds. This control is possible because of preferred Monomer localization at the 2D phase boundary of the immiscible polymer blends. 

The fine powdered PHB was provided by Biomer Co (Krailling, Germany). The chemical structure of PHB structure is well established in the literature and the viscosity average molecular weight Mw = 2.5 x 10 was determined by intrinsic viscosimetry in chloroform solution. The granulated LDPE is commercial product of SAFCT Russian designated standard (15803-020) with following characteristics Mw = 2.5 xio and specific density 0.92 g/cm. ... 

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