Dichlorocarbene modified

The Composition and Sequence Distribution of Dichlorocarbene-Modified Polybutadiene... 

Figure 1. Carbon-13 NMR spectra of three dichlorocarbene-modified cis- polybutadienes in CDC13 (A) Sample 2, 15.4% of double bonds reacted (B) Sample 5, 67.2% of double bonds reacted (C) Sample 7, 97.1% of double bonds reacted. (Reproduced with permission from Ref. 16.)...

Figure 3. Two possible comonomer triads for dichlorocarbene-modified cis-polybutadiene. (Reproduced with permission from Ref. 16.)...

The influence of dichlorocarbene modified natural rubber (DCNR) on the rheological behaviour of blends based on NR and hydrogenated nitrile rubber (HNBR) was studied.The NR used in this study was ISNR 5 grade from India. The HNBR used was a Zetpol 2010 grade (Nippon Zeon, Japan) with... 

The blending of natural rubber with thermoplastics, and other rubbers have been reported in the literature. Thus, blends of NR with (i) ultra-low density polyethylene, (ii) styrene-butadiene rubber (SBR), (iii) epoxidized natural rubber, (iv) acrylonitrile butadiene rubber," (v) chloroprene rubber" and (vi) dichlorocarbene modified styrene-butadiene rubber (DCSBR)" have been prepared, characterized and reported in the literature. 

Hydrogenated nitrile rubber (HNBR) can be blended with NR to improve its oil and ageing resistance without drastically alfecting the dynamic properties. HNBR is widely used to make vibration dampers, timing belts, power transmission belts and bearings because of its ideal balance of properties like excellent heat and oil resistance coupled with good mechanical properties. It combines the oil and fuel resistance of NBR with the heat and oxidation resistance of EPDM rubber. The polarity dilference between the polymers could be reduced by the incorporation of small quantities of dichlorocarbene modified NR (DCNR), which is formed during the alkaline hydrolysis of chloroform in the presence of NR. Some studies in this respect have been reported in the literature. ... 

The reaction of carbenes with olefins to form cyclopropyl derivatives has been used to modify elastomers. Pinazzi and Levesque and Berentsvich et al. found that carbene addition had a significant influence on the properties of polydienes. Thermogravimetric analysis (TGA), flammability and oil resistance in NR and dichlorocarbene modified styrene butadiene rubber (DCSBR) blends were investigated by thermogravimetrie analysis as a funetion of different composition. The TGA plots confirmed the better thermal stability and flame resistance of DCSBR as well as its blends with NR. The amount of DCSBR in the blend significantly affected the properties of blends. 

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