Publication

High-molecular-weight, water-soluble polyammonium compounds

Jutta Christine Wandrey
1982
Patents

Abstract

The title polymers, useful in coatings, paper manuf., etc., are prepd. by polymg. H2O-sol. di-2-alkenyldialkylammonium compds. in aq. solns. contg. peroxydisulfates, basic N compds., and pH control agents. Thus, a soln. 2.8 M in (CH2:CHCH2)2NMe2+ Cl-, 0.02 M in (NH4)2S2O8, 0.07 M in NaOH, and 0.02 M in Et3N [121-44-8] was stirred gently in air at 45 Deg for 10 h to give a polymer [26062-79-3] having relative viscosity (1% NaCl) 2.00, compared with 1.21 when polymd. under N with 10 ppm Chelaplex III in place of NaOH and amine. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/386109a5-fd7a-40a9-aeb7-b2f67ec0329b

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Jutta Christine Wandrey
1982
Patents

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/386109a5-fd7a-40a9-aeb7-b2f67ec0329b

About this result

Related concepts (14)

Viscosity

The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water. Viscosity is defined scientifically as a force multiplied by a time divided by an area. Thus its SI units are newton-seconds per square metre, or pascal-seconds. Viscosity quantifies the internal frictional force between adjacent layers of fluid that are in relative motion.

Newtonian fluid

A Newtonian fluid is a fluid in which the viscous stresses arising from its flow are at every point linearly correlated to the local strain rate — the rate of change of its deformation over time. Stresses are proportional to the rate of change of the fluid's velocity vector. A fluid is Newtonian only if the tensors that describe the viscous stress and the strain rate are related by a constant viscosity tensor that does not depend on the stress state and velocity of the flow.

Hemorheology

Hemorheology, also spelled haemorheology (from Greek ‘αἷμα, haima 'blood' and rheology, from Greek ῥέω rhéō, 'flow' and -λoγία, -logia 'study of'), or blood rheology, is the study of flow properties of blood and its elements of plasma and cells. Proper tissue perfusion can occur only when blood's rheological properties are within certain levels. Alterations of these properties play significant roles in disease processes. Blood viscosity is determined by plasma viscosity, hematocrit (volume fraction of red blood cell, which constitute 99.