By S K De, K Naskar, J White
This e-book presents a starting place in rubber know-how and discusses the latest advancements within the topic. The ebook is written via specialists of their respective fields.The fourteen chapters conceal typical rubber, man made rubber, thermoplastic elastomers, fillers, compounding ingredients, blending, engineering layout, checking out, tyre know-how, automobile functions, sneakers, rubbers in development, toughness of rubber items and rubber recycling.
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Extra resources for Rubber Technologist's Handbook, 2
This is achieved using preservatives such as ammonia. Apart from being a bactericide, ammonia enhances the colloidal stability of latex and deactivates certain harmful metal ions. 0% by weight. During storage, the higher fatty acid esters present in latex are hydrolysed into ammonium soaps, which improves the mechanical stability of latex. Though ammonia is the most effective preservative for NR latex, its pungent smell, the low zinc oxide stability of latex and longer gel time of latex foams are disadvantages.
3 Epoxidised natural rubber (ENR) The mechanical properties of NR are superior to those of most synthetic rubbers. However, with regard to special properties such as oil resistance and gas permeability, NR is inferior to the special purpose synthetic rubbers. Baker and others  and Gelling  reported that epoxidation of NR in the latex stage, under controlled conditions, gives epoxidised NR with improved resistance to hydrocarbon oils, low permeability to air, increased damping and good bonding properties while retaining the high strength properties of NR.
Methyl methacrylate (MMA) and styrene are the common monomers used for grafting onto NR. Poly(methyl methacrylate) (PMMA) graft NR has been commercially produced since the mid-1950s in Malaysia. Generally, grafting can be achieved using free radical initiation by chemical method or by irradiation. MMA graft NR is a self-reinforcing agent for NR with which it is compatible in all proportions. The graft rubber or its blends with NR can be compounded and vulcanised in the same way as rubber. The vulcanisates have excellent physical properties at high hardness levels with good hardness retention at elevated temperatures and good electrical properties.