ORGANIC AND PHYSICAL CHEMISTRY OF POLYMERS phần 8 ppsx

... overall movement of the chain, through the use of a suitable analytical technique. Organic and Physical Chemistry of Polymers, by Yves Gnanou and Michel Fontanille Copyright  20 08 John Wiley & ... FORMULATION, AND POLYMER PROCESSING TECHNIQUES two models, that of Rouse and that of reptation, thus differ by their description of both the diffusion and the vis...

Ngày tải lên: 14/08/2014, 10:20

... the mass of the solute, V 1 and V 2 are the volumes occupied by the solvent and the solute, N 1 and N 2 are the number of molecules of solvent and solute, and M 2 is the molar mass of the solute. One ... m a ,m c ,andm denote the mass of the amorphous and crystalline phases and the total mass phases, respectively. If V c , V,ρ c , and ρ are the bulk volumes and the...

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... transitions and relaxations of polymers, their mechanical properties and their rheology. These thirteen chapters are rounded off by monographs (chapters XIV to XVI) of natural polymers and of some ... between dipoles, R and T being the gas constant and absolute Organic and Physical Chemistry of Polymers, by Yves Gnanou and Michel Fontanille Copyright  20 08 J...

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... volume of pure solvent and N a is Avogadro’s number. For the calculation of the entropy of mixing, it is necessary to consider the con- formational entropies of pure solvent, of pure polymer, and of ... the mixing and also the existence of lower and higher critical temperatures of phase separation when there is a great disparity in the size of components 1 and 2. A...

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... prior establishment of a calibra- tion curve from elution volumes of standard samples as a function of their molar mass. Standard samples of polystyrene for polymers soluble in organic solvents or ... means that the mass of the polycondensate where X  was randomly chosen is the sum of the masses of two parts, one standing on the left- and the other on the right-hand side...

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... Probability (P tr ) of formation of i, h,ands triads, according to Bernouillian statistics. In Figure 8. 1 are plotted the variations of the probabilities of existence of the various types of triads against ... associated with a low value of the energy of activation of the process (E a ∼10 kJ·mol −1 ). Table 8. 8. Rate constants of termination by combination (k tc ) for...

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... r 1 and r 2 are the ionic radius of cation and anion, respectively, and e is the electron charge. This relation shows that by increasing the apparent ionic radius of the cation and that of the ... comparison of a pK a of 41 with that of water which is the conjugated acid of metal hydroxides gives an idea of the very high reactivity of the conjugate base. This imposes...

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... REACTIVITY AND CHEMICAL MODIFICATION OF POLYMERS degradation by depolymerization m t M n t degradation by random chain breaking m t t M n Figure 9.2. Variations of both molar mass and mass of polymer ... use of techniques of high sensitivity and precision such as mass spectrometry (MALDI-TOF) is helpful with respect to the identification of these functional groups. 10.3....

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... bases (one internal and one external) to attain rates of mm triads close to 99% and activities (see definition in Section 8. 8.2) of several hundreds of grams of PP per gram of Ti per h pe MPa. Although ... poly(4-methylpent-1-ene) have attained the industrial level. Organic and Physical Chemistry of Polymers, by Yves Gnanou and Michel Fontanille Copyright  20 08...

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... points: 58 60, 64. Biopolymers: 493. Bipolymers: 23. Bisphenol A: 562, 563, 576, 579, 587 , 588 , 596–5 98. Bisphenol F: 597. Blend (polymer-polymer): 49, 82 87 , 131, 133, 4 78, 480 , 5 28, 531, 579. Blobs: ... 283 . Hyperbranched (polymer): 395–3 98. Ideal solutions: 50, 54, 55, 66. Initiation, Initiators (of polymerizations): 249, 250, 256–2 58, 260, 262, 263, 265, 266, 2 68 274, 2 78...

Ngày tải lên: 14/08/2014, 10:20