Thermoreversible Networks: Viscoelastic Properties and by Klaas te Nijenhuis

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By Klaas te Nijenhuis

This evaluate exhibits that the size of viscoelastic houses is a robust software within the examine of thermoreversible gels. even supposing many conclusions might be drawn approximately community improvement and its constitution, it's also proven that using extra options (e.g. small attitude S-ray and neutron scattering thoughts and optical rotation) and the mix with thermodynamics and community versions, widens the perception within the crosslinking method and the gel constitution temendously. A basic advent is through 8 Chapters bearing on artificial polymers (PVC, PVAL, PMMA, playstation , PAN, PE, ABA blockcopolymers and LCP's) and 4 Chapters referring to biopolymers (gelatin, agarose, carrageenans and gellan gum).

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Extra info for Thermoreversible Networks: Viscoelastic Properties and Structure of Gels

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And the viscosity, q, and equilibrium shear modulus, Go, beforeand afterthe gel point, respectively gel point Crosslink density a more or less detailed description of the crosslink structures. The discussion of the viscoelastic properties will be compared with results obtained by other techniques in order to deepen the insight into the crosslinking process. Sections 2-7 deal with thermoreversible gels of ordinary synthetic polymers (PVC, PVA, PMMA, PS, PAN and PE) and Sects. 8 and 9 with thermoreversible gels of tri- and multi-block copolymers and with gels of liquid crystalline polymers, respectively.

9 wt% PVC gels was followed with dynamic mechanical analysis as well as with small-angle X-ray scattering (SAXS). e. the ageing time) and of the kind of plasticizer (see Fig. 30). From this scattering angle, the authors calculated (with the aid of Bragg's law) a long distance of 30 nm. \ ~,~d , 5 Fig. 30. 9 wt% PVC gels plotted vs the scattering angle for various ageing times; full lines PVC/DOP; broken lines PVC/Reomol. Reproduced from Makromol Chem, Macromol Symp [Ref. 40] by the courtesy of Hiithig & Wepf Verlag Publishers, Zug, Switzerland 15 ' v 50 i 150 SO0 10" f 103 Fig.

82, 83] who measured the annealing effect of unplasticized commercial poly(vinyl chloride) (as a function of time): in Fig. 14 the endothermic effect, as measured by DSC experiments, is plotted vs tog annealing time. Again a linear dependence is shown. 9 wt% PVC/DOP system at 90 °C in Fig. 6 rad/s [31]. e. the cross point of the different curves. 79. In Fig. 16 log G' and log G" 2- IggG' (l'l/rn2) 100h O- -1 -1 Fig. 11. 9 wt% PVC/DOP plotted vs frequency for several ageing times; ageing temperature 90 °C.

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