Nanocomposites polybutadiene/clay

Poly(styrene-fc-butadiene) copolymer-clay nanocomposites were prepared from dioctadecyldimethyl ammonium-exchanged MMT via direct melt intercalation [91]. While the identical mixing of copolymer with pristine montmorillonite showed no intercalation, the organoclay expanded from 41 to 46 A, indicating a monolayer intercalation. The nanocomposites showed an increase in storage modulus with increasing loading. In addition, the Tg for the polystyrene block domain increased with clay content, whereas the polybutadiene block Tg remained nearly constant. 

Recently, nanocomposites were prepared with different grades of nitrile rubber with acrylonitrile contents of 19%, 34%i, and 50%i, with SBR (23%i styrene content), and with polybutadiene rubber with Na-montmorillonite clay. The clay was modified with... 

Ganter et al. [62], utUized a synthetic layered fluorohec-torite silicate and organomontmorillonite to evaluate the role of functional rubber exchanged onto the synthetic clay in the preparation of styrene-butadiene rubber nanocomposites. The functional rubber that was exchanged onto the fluorohectorite was amino-terminated polybutadiene. The styrene-butadiene was dispersed in solvent and then dis-... 

A butadiene-modified clay was prepared to produce PS, HIPS, ABS terpolymer, PMMA, polypropylene, and polyethylene nanocomposites by melt- or solution blending [73, 74]. The butadiene surfactant was obtained from the reaction of vinylbenzyl chloride-grafted polybutadiene with a tertiary amine (Table 3.6). All the composites were immiscible microcomposites. 

S. Su, D. D. Jiang, and C. A. Wilkie, Polybutadiene-modified clay and its polystyrene nanocomposites. Journal of Vinyl and Additive Technology, 10 (2004), 44-51. 

T. Yamaguchi and E. Yamada, Preparation and mechanical properties of clay/polystyrene-block-polybutadiene-block-polystyrene triblock copolymer (SBS) intercalated nanocomposites using organoclay containing stearic acid. Polymer International, 55 (2006), 662-7. 

Song M, Wong C W, Jin J, Ansarifar A, Zhang Z Y and Richardson M (2005) Preparation and characterization of poly(styrene-co-butadiene) and polybutadiene rubber/clay nanocomposites. Polymer Intern 54 560-568. 

Su, S., Jiang, D.D., Wilkie, C.A., Novel polymerically-modified clays permit the preparation of intercalated and exfoliated nanocomposites of styrene and its copolymers by melt blending . Polymer Degradation and Stability, 2004,83,333-346. Su, S., Jiang, D.D., Wilkie, C.A., Polybutadiene-modified clay and its nanocomposites . Polymer Degradation and Stability, 2004, 84, 279-288. 

Table 12.2 summarizes the mechanical properties of polybutadiene rubber-clay nanocomposites. The hardness, tensile strength, elongation at break, and permanent set all improved with increasing the clay content (5—40 phr)." " The mechanical properties of polybutadiene rubber-clay nanocomposite with 20 pin-clay content have been compared to those of the polybutadiene composites filled with 20 phr carbon black (SFR and N330), as presented in Table 12.3. This data shows that the organically-modified layered silicate was as effective a reinforcing filler, as carbon black. Some of the mechanical properties of polybutadiene nanocomposite such as hardness, tear strength, and tensile strength even exceeded those of the carbon black filled compounds." " These excellent mechanical properties of the nanocomposites resulted from the uniformly dispersed layered silicate in the elastomer matrix, and the strong interaction between the nanoclay layers and rubber chains. Thus layered silicates could be used in the polybutadiene industry as a promising reinforcing filler, if the layers...

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