Polymerization rheological properties

Solutions of some polymeric materials also have similar rheological properties and behave in the same way as suspensions in pipe flow. However, they do in time break down and they do not give any appreciable increase in buoyancy as their densities differ little from that of water. 

The rheological properties of insitu polymerized nanocomposites with end-tethered polymer chains were first described by Krisnamoorti and Giannelis [33]. The flow behavior of PCL- and Nylon 6-based nanocomposites differed extremely from that of the corresponding neat matrices, whereas the thermorheological properties of the nanocomposites were entirely determined by the behavior of the matrices [33]. The slope of G (co) and G"(co) versus flxco is much smaller than 2 and 1, respectively. Values of 2 and 1 are expected for linear mono-dispersed polymer melts, and the large deviation, especially in the presence of a very small amount of layered silicate loading, may be due to the formation of a network structure in the molten... 

Onogi,S., Masuda,T., Ibaragi,T. Rheological properties of polymethyl methacrylate and polyvinyl acetate in the molten state. Kolloid-Z. Z. Polymere 222, 110-124... 

As in traditional chain polymerization, the molecular weights are controlled by the catalyst concentration. Thus the more catalyst used, the lower the molecular weights. SEC indicates quite high MW (>130 kDa), that likely contributes to good rheological properties. PSE heated in the TGA under Ar to 1000 °C, undergoes smooth mass loss... 

Many processes involving the flow of a reactive liquid along a tube are known, which makes theoretical analysis of the flow of polymerizing liquids, i.e., fluids with time-dependent rheological properties, relevant to the tubular polymerization reactors and similar plant equipment used in reactive processing. 

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