Fourier transform rheometry

Fourier Transform Rheometry with an Updated Closed Cavity Torsional Rheometer. 823... 

Updating a Torsional Dynamic Tester for Fourier Transform Rheometry.825... 

FOURIER TRANSFORM RHEOMETRY WITH AN UPDATED CLOSED CAVITY TORSIONAL RHEOMETER... 

J.L. Leblanc, Investigating the non-linear viscoelastic behavior of filled mbber compounds through Fourier transform rheometry. Rubber Chem. TechnoL, 78, 54—75, 2005. 

J.L. Leblanc and C. de la Chapelle, Updating a torsional dynamic rheometer for Fourier transform rheometry on mbber materials. Rubber Chem. TechnoL, 76, 287-298, 2003. 

J.L. Leblanc, Fourier Transform rheometry A new tool to investigate intrinsically non-linear viscoelastic materials, Ann. Trans. Nordic Rheol. Soc., 13, 3-21, 2005. 

Strain sweep tests (rubber process analyzer, updated for fourier transform rheometry) on molten virgin and carbon black filled poly(ethylene-co-butyl acrylate) composites and likely morphology in both the solid and molten states. 

J.L. Leblanc, K.-M. Jager. Investigating non-linear viscoelastic properties of molten carbon black/poly(efhylene-co-butylacrylate) comjxjsites, using Fourier transform rheometry and o1her test techniques. /. Appl. Polym. Sci., 101,4071-4082,2006. 

FIGURE 30.6 Updating a closed cavity torsional dynamic tester for Fourier transform (FT) rheometry. 

IR dichroism has also been particularly helpful in this regard. Of predominant interest is the orientation factor S=( 1/2)(3—1) (see Chapter 8), which can be obtained experimentally from the ratio of absorbances of a chosen peak parallel and perpendicular to the direction in which an elastomer is stretched [5,249]. One representation of such results is the effect of network chain length on the reduced orientation factor [S]=S/(72—2 1), where X is the elongation. A comparison is made among typical theoretical results in which the affine model assumes the chain dimensions to change linearly with the imposed macroscopic strain, and the phantom model allows for junction fluctuations that make the relationship nonlinear. The experimental results were found to be close to the phantom relationship. Combined techniques, such as Fourier-transform infrared (FTIR) spectroscopy combined with rheometry (see Chapter 8), are also of increasing interest [250]. 

Ryan and coworkers investigated the effect of chain extenders on the morphology of flexible PU foams by using SAXS, Fourier transform infrared spectroscopy and rheometry [44]. By the addition of chain extenders, the onset of microphase separation was delayed and the interdomain spacing was increased. The effect was found to strongly depend on the chemical structure of the chain extenders and the compatibility between chain extenders and urea segments... 

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