Elastomers crosslinked

The elastomers crosslinked with LHT-240, including the Tri-NCO formulation, contained 0.03% dibutyltin dilaurate as a curing catalyst and were cured in closed molds (see below) for 8 hours at 100°C. Preliminary experiments showed that such a formulation after cure for either 4 or 8 hours at 100°C swelled the same amount in benzene and contained the same amount of extractable material, termed sol. The elastomer crosslinked with TIPA contained 0.02% ferric acetylacetonate as catalyst and was cured for 24 hours at 60°C. This formulation after cure for either 24 or 48 hours was found to swell the same amount in benzene. 

Table I. Swelling of Various Elastomer Crosslinked Networks in Differential Solvents at — 25°C...

The ultimate aim of optical spectroscopy or similar studies is to elucidate the chemistry of elastomer crosslinking with respect to both the structures formed and the reaction kinetics in order to provide a sound basis for structure/property relationships. As a result, it will be possible in the future to develop rubber products with less trial and error [18, 19, 55, 56, 125]. 

This chapter addresses three basic classes of polymers and the approaches for processing them into compounds. These classes include thermoplastic polymers, and two types of elastomers -crosslinked elastomers, and thermoplastic elastomers. Compounds prepared from each class have a range of achievable properties, and each category of compounds may have overlapping properties. Each category is prepared by different technical approaches with varying controls, energy requirements, and limitations. A brief definition of each class follows. Also included, later in the chapter, is a detailed description of how additives influence the production process. 

The phenomenology of failure of amorphous elastomers (crosslinked amorphous polymers at T>Tg) differs from the scheme shown in Figure 11.9. It will be discussed later. 

Nasar, A. S., Jikei, M., Kakimoto, M.aki. (2003). Synthesis and properties of polyurethane elastomers crosslinked with amine-terminated AB2-type hyperbranched polyamides, Eur. Pnlvm. 1. 39,1201-1208. 

Uses Initiator for polymerizations, for cure of polyester resins, acrylic syrup, and elastomers crosslinking agent for olefin copolymers, elastomers, chlorinated PE, EPDM, SBR, Neoprene, Mypalon Trade Name Synonyms Aztec NBV-40-G t[Aztec Peroxides] Aztec NBV-40-IC t[Aztec Peroxides] Luperox 230 [Atofina SA http //www.atofina.com] Atofina http //WWW. atofinachemicais. com] Lu persol 230 t[Atofina N. Am./Org. Peroxides Atofina SA http //www.atofina.com]] Perhexa V t[NOF... 

Isobutyl 4-chloro-3,5-diaminobenzoate Empirical C11H15CIN2O2 Properties M.w. 242.70 Uses Curing agent for polyurethane elastomers crosslinking agent for thermosetting resins Isobutyl cinnamate... 

It is observed that Slapp of nano-CaCOs is less than the commercial CaCOs filled SBR which is attributed to greater crosslinking of rubber, as the uniform dispersion of nano-CaCOs brings the chains closer and keeps them intact with nanoparticles. Swelling depends on elastomer crosslinking density and solvent used. Solvent penetration is more in commercial micron size CaCOa than the nano-CaCOs rubber composites. 

Fig. 15 Electrooptical hysteresis of a ferroelectric elastomer crosslinked in the Sc phase [23]...

The chemistry of carboxylic elastomer crosslinking reactions has been thoroughly discussed by Brown [177] in a review article. The experimental data reveal... 

Polyamide-polyolefin blends Moldings with improved modulus and heat distortion Multilayer containers Blow molding containers Polyolefin composites Thermoplastic elastomers Crosslinked, molded sheets... 

TTTTTTTTT A-HOPE B-LLDPE LDPE TTTTTTTTTTTTTTTTTT C - Thermoplastic elastomer crosslinked rubber ... 

Journal of Applied Polymer Science 63, No.lO, 7th March 1997, p.1353-9 APPLICATIONS OF AN AZIDE SULPHONYL SILANE AS ELASTOMER CROSSLINKING AND COUPLING AGENT... 

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