Poly rheological properties

Thus, measuring rheological properties of dispersions of low-molecular-weight (with viscosity about 60 Pa s) and high-molecular-weight poly(isobutilene) (with viscosity about 10s Pa s) with the same content of filler we see that the values of creep viscosity r c of these systems are practically equal, in spite of the difference of the viscosity of the dispersion medium more than 1000 times [3],... 

Ali, F., Chang, Y., Kang, S.C., Yoon, J.Y. 2009. Thermal, mechanical and rheological properties of poly (lactic add)/epoxidized soybean oil blends. Polymer Bulletin. 62 91-98. 

Xu, Y. and Qu, J. 2009. Mechanical and rheological properties of epoxidized soybean oil plasticized poly(lactic acid). Journal of Applied Polymer Science 112 3185 - 3191. 

A paper on The rheological properties of poly(fluorophenylene germane) dendrimers was published by Myasnikova and co-workers in the Russian journal Polym. Sci., Ser. 

Blends of poly (ethylene terephthalate) (PETP) and polypropylene (PP) with different rheological properties were dry blended or compounded, and extrusion foamed using both physical blowing and chemical agents, and the foam properties compared with those of foam produced from the individual components in the absence of compatibilisers and rheology modifiers. The foams were characterised by measurement of density, cell size and thermal properties. Low density foam with a fine cell size was obtained by addition of a compatibiliser and a co-agent, and foamed using carbon dioxide. The presence of PP or a polyolefin-based compatibiliser did not effect... 

Wang S, Huang Y, Cong G (1995) Rheological properties of poly(propylene carbonate). Chin J Appl Chem 12(6) 96-98... 

Needless to say, the rheological properties of polymer mixtures are complex and nearly impossible to predict. Figure 4.12 shows the viscosity of a natural rubber (NR)/poly(methyl methacrylate) (PMMA) blend (top curve) as a function of percentage NR [2]. For comparison, the predictions of four common equations are shown. The equations are as follows ... 

Mills, N.J. The rheological properties and molecular weight distribution of poly-dimethylsiloxane. European Polymer J. 5,675-695 (1969). 

Ruckdaschel H, Rausch J, Sandler JKW, Altstadt V, Schmalz H, Muller AHE (2008) Correlation of the melt rheological properties with the foaming behavior of immiscible blends of poly(2,6-dimethyl-l,4-phenylene ether) and poly (styrene-co-acrylonitrile). Polym Eng Sci 48 2111-2125... 

Lepoittevin, B., Devalckenaere, M., Pantoustier, N., Alexandre, M., Kubies, D., Calberg, C., Jerome, R., and Dubois P. Poly (l-caprolactone)/clay nanocomposites prepared by melt intercalation Mechanical, thermal and rheological properties, Polymer (2002), 43,4017-4023. 

As block copolymers are still rather expensive materials, it may be advantageous to use them as additives to important industrial polymers. In this domain, possibilities are extremely numerous and diverse. They include an improvement of chemical properties such as resistence to degradation agents, or rheological properties such as adhesion of vinylic paints, high impact properties of conventional thermoplastics, or a compatibilization of polyolefins, polystyrene and poly(vinyl chloride) allowing the reuse of polymeric waste products. The above examples illustrate the great intrinsic potential of block copolymers in the quest of new materials with specific properties. 

Chuai CZ et al. (2004) The effect of compatibilization and rheological properties of polystyrene and poly(dimethylsiloxane) on phase structure of polystyr-ene/poly(dimethylsiloxane) blends. J Polym Sci Part B Polym Phys 42(5) 898—913... 

Etchenique and Calvo [75, 76] developed a fast real time measurement of R and XL element of the electroacoustic impedance applied the LEM model of Martin to measure the rheological properties of poly(allylamine)-GOx hydrogels under fast electrochemical perturbations and derived the viscoelastic properties of the film from the quartz equivalent parameters. For thin viscoelastic films, this method was able to separate the mass due to ions and solvent exchange and the viscosity changes, when the density and the elasticity of the overlayer was known. 

Summary Rheological properties of compositions containing oligoethylsiloxane, poly-a-olefin, and dioctylsebacinate were studied. Both energetic and structural factors were shown to affect the fluidity of compositions. 

Shih, C.J. and Hon, M.H., Electrokinetic and rheological properties of aqueous TiN suspensions with ammonium salt of poly(methacryhc acid), 7. Eur. Ceram. Soc., 19, 2773, 1999. 

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