Blends of Natural Rubber

Fig. 7. Transmission IR spectra of a 1 1 wt% blend of natural rubber and chlorinated natural rubber, solvent cast from xylene, (a) Before heating, and (b) after heating at 170°C for 30 min [62].

Technical data sheets , Malaysian Rubber Producers Research Association, Ttin Abdul Razak Laboratory, Brickendonbury, Herts. SG13 8NL (1995). Data sheets for various blends of natural rubber. 

FIGURE 20.4 (a, b) Height and phase images of rubber blend of natural rubber (NR) and butylene rubber (BR) (50 50), which were taken immediately after cryo-ultramicrotomy. (c, d) Height and phase images of the same sample location as in (a, b) taken 12 h later. 

Blends of natural rubber or styrene-butadiene rubber with high styrene resins used as soling material in footwear manufacture. Such resin rubbers should not be confused with... 

The carcass requires better flexing properties than the tread and is a blend of natural rubber and SBR, but at least 60% of natural rubber. The sidewalls have a lower percentage of natural rubber, from 0-50%. The liner is made of butyl rubber because of its extreme impermeability to air. 

Graft polymers were obtained by mastication of a 60/40 blend of natural rubber and chlorosulphonated polyethylene (/). From 10-55% natural rubber was obtained as side chains. Grafting presumably proceeds by transfer of chlorine atoms to the rubber radicals to give grafting sites for combination with rubber radicals. Soluble linear polymers were also obtained by mastication for 50-180 min under nitrogen for a blend 50/50 of natural rubber and a polyurethane rubber (Vulcaprene A) (/). 

Tinker. AJ. and KP. Jones Blends of Natural Rubber Novel Techniques for Biending with Specialty Polymers, Chapman Hall, New York. NY. 1998. Thomas H. Rogers, Consultant (Rubber and Plastics Industries), formerly Research Manager, Goodyear Tire and Rubber Company. Akron, OH,... 

Fig. 5 Surface of blend of natural rubber and butadiene rubber (45 55) after UV exposure while under tensile stress (applied parallel to the vertical). The lower part of the sample was shielded from the UV illumination and suffered very much less visible degradation than the upper zone. (See also RQfP )...

Investigations of polymer blends has developed an increased understanding of interphase organization. In blends two interfaces exists the interface between two matrix types and distribution of filler and its interfaces with this matrices. The interphase of carbon black in blends of natural rubber and EPDM depends on the character of carbon black (surface groups available for interaction), the viscosity,... 

Hydrofluoric acid (2 weeks at 20 °C) Heavily loaded blends of natural rubber with Perbunan... 

Tread The wear resistance component of the tire in contact with the road. It must also provide traction, wet skid, and good cornering characteristics with minimum noise generation and low heat buildup. Tread components can consist of blends of natural rubber, polybutadiene (BR), and styrene-butadiene rubber (SBR), compounded with carbon black, silica, oils, and vulcanizing chemicals. 

The blending of natural rubber with SBR imparts increased resilience and tack. Increased resilience arises because of the ability of natural rubber to crystallize on deformation. 

Fig. 1. G and tan g vs temperature of a 1 1 blend of natural rubber with polystyrene resin.

Fig. 4. Photomicrograph of a blend of natural rubber (75%) with poly-...

Effect of resin molecular weight on tan 5 plots of 1 1 blends of natural rubber with poly (vinyl cyhclohexane) resins. Resin as shown. 

Fig. 15. Effect of concentration on tan S plots of blends of natural rubber with poly(vinyl cyclohexane) resin.

Tan 6 peak temperature vs concentration for blends of natural rubber with compatible resins. 

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