Divinyl rubbers

As with spin-labelled methylvinylpyridine, chloroprene and divinyl rubbers have been obtained. 

Reztsova and Chubarova [24] studied butadiene-styrene and divinyl rubbers as well as natural rubber. Each polymer was mixed with several inhibitors including lonol and A -phenyl-A -isopropyl-p-phenylenediamine. The mixtures were milled at 80 K in air and in vacuum. An increase in test temperature caused no change in the ESR signal shape for uninhibitied... 

Polychloroprene rubber (CR) is the most popular and versatile of the elastomers used in adhesives. In the early 1920s, Dr. Nieuwland of the University of Notre Dame synthesized divinyl acetylene from acetylene using copper(l) chloride as catalyst. A few years later, Du Pont scientists joined Dr. Nieuwland s research and prepared monovinyl acetylene, from which, by controlled reaction with hydrochloric acid, the chloroprene monomer (2-chloro-l, 3-butadiene) was obtained. Upon polymerization of chloroprene a rubber-like polymer was obtained. In 1932 it was commercialized under the tradename DuPrene which was changed to Neoprene by DuPont de Nemours in 1936. 

Covalent polymeric networks which are completely disordered. Continuity of structure is provided by an irregular three-dimensional network of covalent links, some of which are crosslinks. The network is uninterrupted and has an infinite molecular weight. Examples are vulcanized rubbers, condensation polymers, vinyl-divinyl copolymers, alkyd and phenolic resins. 

In another system, miscible blends of PE and lauryl methacrylates (LMA) were in situ polymerized/crosslinked to yield submicrometer rubber particle sizes ranging from 70 to 400 nm [55]. Divinyl benzene (DVB) was used as a crosslinking system for LMA (rubber precursor). Typical TPV morphologies consisting of a crosslinked PLMA rubber dispersion (gel content >90%) in a PE matrix and, consequently, typical TPV solid-state properties are obtained. 

Some dienes may be polymerized to form rubber-like substances. For example divinyl and isopiene are used for the manuf of synthetic rubber... 

Cross-links limit the mobility of macromolecular chains, and thus give rise to an increase in Tg. With a very low concentration of cross-links this effect is hardly detectable. Experiments with the system polystyrene + divinyl benzene showed that at a concentration of 0.4 % of DVB and higher a detectable increase of Tg occurred. With rubbers, vulcanized with sulphur, the detection limit for an increase of Tg appeared to be at 1 to 2 % of sulphur, so that for a technically vulcanized rubber the level of Tg is hardly influenced by the vulcanization process. 

Hydrosilylation of unsaturated organosilicon compounds has also found several applications in molecular and polymer organosilicon chemistry. In particular, the addition of polyfunctional silicon hydrides to poly(vinyl)organosiloxane, catalyzed exclusively by Pt compounds and providing an activated cure for silicon rubber [10], has been of great practical importance. Hydrosilylation of the vinyl group at silicon seems to be effective synthetic method for preparation of oligomers and polymers with a linear or cyclolinear stmcture (polyhydrosilylation), and can occur either via the addition of dihydro-carbosilanes and -siloxanes to divinyl-silanes and -siloxanes [25, 26] or by intermolecular hydrosilylation [4] (eq. (1)). 

Biethylene Bivinyl Butadieen Buta-1,3-dieen Butadien Buta-1,3-dien Butadiene Buta-1,3-diene 1,3-Butadiene a,o-Butadiene Butadiene monomer CCRIS 99 Divinyl EINECS 203-450-8 Erythrene HSDB 181 NCI-C50602 UN 1010 r n Vinylethylene, Monomer for BUNA rubbers. Gas mp = -108,9° bp = -4.4° Lm =... 

Beilstein Handbrjok Reference) AI3-28026 BRN 1731349 CCRIS 964 Diethylhydroxyl-amine N,N-Diethylhydroxyamine EINECS 223-055-4 Ethanamine, N-ethyl-N-hydroxy- Hydroxylamine, N,N-diethyl- N-Hydroxydiethylamine Pennstop 1866. Free radical scavenger used by the rubber industry as an emulsion polymerization inhibitor vapor phase inhibitor for olefin or styrene monomer recovery systems in-process inhibitor for production of styrene, divinyl benzene, butadiene and isoprene. Liquid mp = 10° bp = 133° d = 0.8669. ElfAtochem N. Am. 

CCRIS 6253 EINECS 201-143-3 HSDB 620 Isopentadiene Isoprene p-Methylblvinyl 2-Methyl-divinyl 3-Methyl-1,3-butadiene NSC 9237 UN1218. Used in rubbers, sealants, latex paints and as a solvent. Volatile liquid mp = -145.9 bp = 34 d = 0.679 insoluble in H2O, soluble in organic solvents. Equistar Chemical Products Lancaster Synthesis Co. Mallinckrodt Inc. Sigma-Mdrich Fine Chem. 

Many studies have appeared dealing with the properties of crosslinked polymer systems. These include adhesion of epoxy-acrylates onto tin-plate, adhesion of isocyanate and epoxy-resin coatings, adhesion of butadiene-acrylate rubbers onto metals, glass, and ceramics, adhesion of acrylic, thiol, and polyester resins to aluminium bodies, and the mechanical and physical properties of photo-crosslinkable poly(vinyl cinnamate), vinyl-divinyl copolymers,polythiols, acrylates, epoxies, and thiols,epoxy resins, polyesters on wood, ... 

---