Polybutadiene filled

Polymethylmethacrylate Polystyrene Polyvinyl alcohol Polypropylene Polyacrylonitrile Polyvinyl chloride Nitrocellulose Polyethylene Polytetrafluorethylene Poly a methyl styrene Hydroxy-terminated polybutadiene filled with ammonium perchlorate Hydroxy-terminated polybutadiene filled with potassium chloride Nylon 66... 

Fig. 14. SEM photograph of the fracture surface of polybutadiene filled with glass beads (30-95/im in diameter) showing the high degree of interfacial failure.

Fig. 23. The typical TOF distribution for PIE from polybutadiene filled with glass beads. The drift...

Tbe PTC amplitude depends on crystallinity. Meyer (136) showed that crystalline raA s-polybutadiene filled with carbon black has low room temperature resistivity and a significant anomaly, whereas the amorphous cfs-polybutadiene filled with the same amoimt of carbon black has much higher resistivity and no... 

Silicone rubber filled with microspheres and reinforced with a plastic honeycomb Polybutadiene-acrylonitrile elastomer modified phenolic resin with a subliming powder... 

Figure 3. Modulus contributions from chemical cross-links (Cx, filled triangles) and from chain entangling (Gx, unfilled symbols) plotted against the extension ratio during cross-linking, A0, for 1,2-polybutadiene. Key O, GN, equibiaxial extension , G.v, pure shear A, Gx, simple extension Gx°, pseudo-equilibrium rubber plateau modulus for a polybutadiene with a similar microstructure. See Ref. 10.

Fig. 4.13 Momentum transfer dependence of the characteristic time associated to the self-motion of protons in the a-relaxation regime Master curve (time exponentiated to p) constructed with results from six polymers polyisoprene (340 K, p=0.57) (filled square) [9] polybutadiene (280 K, p=0Al) (filled circle) [146] polyisobutylene (390 K, p=0.55) (empty circle) [147] poly (vinyl methyl ether) (375 K, f=0A4) (filled triangle) [148] phenoxy (480 K, p=0A0) (filled diamond) [148] and poly(vinyl ethylene) (340 K, p=0A3) (empty diamond) [ 146]. The data have been shifted by a polymer dependent factor Tp to obtain superposition. The solid line displays a Q -dependence corresponding to the Gaussian approximation (Eq. 4.11). (Reprinted with permission from [149]. Copyright 2003 Institute of Physics)...

SBR is the most widely used synthetic elastomer. It is an amorphous random copolymer consisting of a mixture of l.2, cis and trans isomers. Cold SBR produced at —20 C consists of 17% 1,2. 6% cis and 77% trans isomers of polybutadiene. This commercial product has a Tt of -60 C, an index of refraction of 1.534S, and a coefficient of linear expansion of 66 X 10 s cm/ cm C. Because of the high percentage of the trans isomer, it is less flexible and has a higher heat buildup, when flexed, than Hevea rubber. Although carbon black-filled or amorphous silica-filled SBR has useful physical and mechanical properties, the SBR gum rubber is inferior to Hevea rubber. 

Fig. 7. Self-diffusion of linear (open symbols) and three-armed star (filled symbols) polystyrenes (squares) and polybutadienes (circles) in CC14 extrapolated to infinite dilution, as function of polymer molecular weight (Ref. 53>, with permission).

Et cellulose, polyurethan or polybutadiene) ca 2%. After evacuating the gases, the interstitial spaces betw the pellets are filled with a 75 25 mixt of an oxidizer and a curable liquid binder, to comprise ca 40% of the final... 

Below a characteristic temperature, T0, of about 15° to 16°C, the shift factors appear to follow the WLF equation, Equation 2, with C = 7.1, C2 = 135.9°C, and Tr — 0°C. The coefficients were determined in the usual way (6). The temperature dependence of both the relaxation moduli and the creep compliances could be described with the same WLF equation within the experimental scatter. It appears that below T0 the triblock copolymer behaves essentially as a filled rubber, the polystyrene domains acting only as inert filler. However, the WLF equation which describes the temperature dependence of the mechanical properties in this region is not identical with that of pure 1,4-polybutadiene, for which Maekawa, Mancke, and Ferry (20) find cx — 4.20, c = 161.5°C,... 

The Teflon-filled vulcanizates have not been included until now since this filler must be considered as a special case, involving poor adhesion at the filler-rubber interface. The marked difference between Teflon and the other fillers is seen in Figure 9, which shows that the Teflon filler exerts only a slight effect on the tensile strength of the polybutadiene vulcanizate. As a matter of fact, although this filler does increase the strength slightly at temperatures above 0°C, it actually appears to de-... 

R Diameter of the cylinders filled by the insoluble polybutadiene Mocks... 

The rubber particles were examined with an electron microscope after the sample was treated with osmium tetroxide (27). The micrograph (Figure 7) clearly indicates the porous nature of the rubber phase and the occlusion of polystyrene. We therefore classify this type of rubber phase as filled graft rubber. Since grafting takes place before and after the rubber chain is coiled, therefore, for this case, the monomer is grafted onto the rubber both within and without the rubber phase. Polybutadiene is thus made more compatible to the polymer matrix surrounding the rubber phase and the polymer filling the rubber phase. Here we have an... 

In hydrocarbons, a polybutadiene is obtained containing about 35 % 1,4-cis, 54 % 1,4-trans and 11 % 1,2 units, while isoprene is polymerized under the same conditions with a cis selectivity of more than 90 %. By addition of polar ligands, such as tetrahydrofuran, dimethylglycol ether, tetramethylethylendiamine, or dipiperidylethane in the butadiene polymerization, the 1,2-selectivity can be enhanced by up to 100%. The effect increases with the coordination power and probably also with the space-filling ability of the ligand, and decreases with a rise in temperature. 

Determination of the intrinsic viscosity for three different polybutadiene samples in tetrahydrofuran at 25°C. Each sample exhibits linear Huggins (filled symbols) and Kraemer (open symbols) plots that extrapolate to the intrinsic viscosity at zero concentration. All three polymers have Huggins coefficients of 0.37. 

Viscosity data for three linear polymers corrected to the friction coefficient of high molar mass polymer at roughly 7 g+ 120K, fit to Eq. (8.137) (curves). Open circles are polyisobutylene (r=50°C) with Mc = 14000 gmoP. filled squares are polybutadiene (7 =25°C) with A/< = 6700gmor open triangles are free radically prepared polystyrene T =217°C), and filled triangles are anionically prepared polystyrene T=2[1 C) with... 

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