ORGANIC AND PHYSICAL CHEMISTRY OF POLYMERS phần 3 ppsx

... 133 Figure 5 .36 . Diagram of the morphology of relaxed S-B-S thermoplastic elastomers revealing the physical cross-linking of the system by the glassy nodules of polystyrene. Block or graft copolymers ... 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...

Ngày tải lên: 14/08/2014, 10:20

... The decrease of η with high values of ˙γ enables high rates of pro- duction. However, the viscosity of polymers can vary with time (Figure 13. 3) for a constant rate of shearing, and this has ... experiment. DYNAMICS OF POLYMER MELTS 4 73 13. 1.5. Hydrodynamic Theories and Interpretation of the Phenomena Like the viscosity of all other liquids, that of polymer melts i...

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... these conventions: O O CH 3 H HHH HHHHH O O CH 3 O O CH 3 Sequence of 3 successive units (triad) of poly(vinyl acetate) presenting the same configuration HH H H HH HHHH CH 3 CH 3 Sequence of 2 successive ... following ones: δ CH 3 = 0.80 ppm, δ CH 2 = 1.20–1 .35 ppm, δ CH =1.6ppm. 3 J [CH–CH 3 ] = 6.5 Hz, δ CH 3 = 0.80 ppm, δ CH 2 = 1.20–1 .35 ppm, δ CH =1.6ppm. 3...

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... low values of Y , F(Y ) can be developed into a series of the form F(Y)= 1 − Y 2 3/ 2 2! + Y 2 3 3/2 3! (4.50) with Y = 2  1 2 −χ 12  χ 2 v 1  3 4πs 2  3/ 2 (4.51) Introduction of the specific ... 0. 43 1.178 Polystyrene (atactic), PS 735 0 .36 1.105 Poly(2,6-dimethyl-1,4-oxyphenylene), PPO 739 0.52 1.161 Poly(α-methylstyrene), PαMS 768 0 .38 1.079 4.5.2. Case of Block Cop...

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... (π 3, odd,X and π 3, odd,Y )thatX–AA–X leads to or is a component of a polycondensate consisting of 3 X–AA–X units and a total of 5 or 7 units: π 3, odd,X = 3p 2 X p 2 Y (1 −p X ) 2 π 3, odd,Y = 3p 4 X p 2 Y (1 ... phenomenon and one obtains α H =[V H /V H,θ ] 1 /3 .The preceding equation can thus be written as [η] = α 3 H [η] θ = α 3 H φ θ s 2  3/ 2 0 M = α 3 H φθ...

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... Stabilization Energy of Radical Molecule R–H E d (C–H) (kJ·mol −1 )R • (kJ·mol −1 ) H–CH 3 426 0 H–CH 2 –CH 3 3 93 33 H–C(CH 3 ) 3 376 50 H–CH 2 –CH = CH 2 32 4 102 H CH 2 32 2 104 It must be stressed ... condensation occurs by nucleophilic substitution, and the result of the self-condensation of silanol groups is poly(dimethylsiloxane): Si CH 3 OH CH 3 OSi CH 3 CH...

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... coordination of the double bond ANIONIC POLYMERIZATION 32 7 and mainly covalent active species. + n H 3 C H 3 C H 2 C H 3 C H 2 C C CH 3 CH 3 H 3 C CH 3 CH 2 CH 2 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 2 CH 2 CH 2 C CO COOR 1 COOR 1 COOR 2 COOR 1 COOR 2 OR 2 OR 2 OR 2 OR 2 OR 2 , C CO propagation C n C , C CO CC O ... presence of a “catalyst.” The reaction pathway i...

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... the synthesis of styrene-dimethylsiloxane block copolymers: PS − , Li + SiCl CH 3 CH 3 PDMS LiCl Si CH 3 CH 3 CH 2 CH 2 Si CH 3 CH 3 OPS PDMS O Si CH 3 CH 3 H + H 2 PtCl 6 Si CH 3 CH 3 PS + + The ... interpenetration is hindered and viscosity particularly low. Like the case of stars, there are two main methods of synthesis of dendrimers. POLYMERS WITH COMPLEX...

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... level. Organic and Physical Chemistry of Polymers, by Yves Gnanou and Michel Fontanille Copyright  2008 John Wiley & Sons, Inc. 5 13 POLY(CONJUGATED DIENES) 5 23 15.2.1.1. Monomer. Buta-1 ,3- diene ... production of MMA monomer involves the reaction of acetone with cyanhydric acid according to the following reaction pathway: H 3 C-CO-CH 3 + HCN H 3 C C N OH CH...

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... 15, 109, 32 2, 567. Carbanions, Carbanionic species: 31 0 31 6, 32 1, 32 4 32 5, 33 4, 37 9, 38 0, 38 4, 38 9, 39 1, 39 2. Carbocations, Carbocationic species: 32 9, 33 2 33 5, 33 9 35 0, 34 2, 34 3, 36 6, 38 9, Carbon ... (Lewis): 31 3, 32 6, 32 7, 32 9, 33 2, 33 3, 34 0, 34 7. Acids (nucleic): 115, 118. Acids (protonic): 31 0, 33 0, 33 1. Acronyms: 10, 11, 12. A...

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