By J W Goodwin, R W Hughes
''... well-suited for self-study by means of examine staff and technologists, who, faced with technical difficulties during this region, would favor an easy advent to the topic of rheology.'' Chemical Educator, ''... jam-packed with precious insights and up to date information.'' Chemistry World.
Rheology is basically concerned about fabrics: clinical, engineering and daily items whose mechanical behaviour can't be defined utilizing classical theories. From organic to geological structures, the main to figuring out the viscous and elastic behaviour firmly rests within the courting among the interactions among atoms and molecules and the way this controls the constitution, and eventually the actual and mechanical houses. Rheology for Chemists An creation takes the reader during the diversity of rheological principles with no using the advanced arithmetic. The booklet offers specific emphasis at the temporal behaviour and microstructural elements of fabrics, and is targeted in scope of reference. an outstanding creation to the more moderen medical parts of sentimental topic and complicated fluid examine, the second one variation additionally refers to approach size and the maturing of the instrumentation marketplace.
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Extra info for Rheology for Chemists: An Introduction
Sample text
The potential number of network springs is ns ¼ ðNi À 1Þ NA c 2 Mn ð2:57Þ Here, the 2 in the denominator is to avoid double counting as it takes two sites to form one link. 57) must be modified for these effects. 25 m5 kg–1 s–2 in line with swollen rubber networks and fl is a correction for the probability of closed loops being formed, which can be written ! 12 and give a good fit to the data with between three and four hydrophobes per chain. 6 Noninteractive Fillers There are many situations when polymer networks contain a filler.
When there are 2 or more, each site can lead to a network spring if more than two hydrophobes can cluster to form a node. 12 0 5 10 15 c kg/m3 20 25 The network modulus of a solution of an HMHEC in water. 57) and the experimental points taken from Ref. 24. The molecular weight was Mn ¼ 105 and there were B4 hexadecyl hydrophobes per cellulose chain at synthesis. 40 Chapter 2 network where only two chains would be joined by the formation of the link. ) The potential number of network springs is ns ¼ ðNi À 1Þ NA c 2 Mn ð2:57Þ Here, the 2 in the denominator is to avoid double counting as it takes two sites to form one link.
The reason is that water is a strongly hydrogen-bonding solvent and will interact differently with different types of polymer. Some parts of the chain may be less soluble than others because they cannot fit into the water structure and so they tend to cluster together. To illustrate this we will consider in some detail the polymers used as ‘‘associative thickeners’’. These are particularly good examples of how the chemical details of a polymer chain are of major importance in determining the rheological behaviour.