Triallyl

Hydrogenated nitrile rubbers were introduced in the mid-1980s as Therban by Bayer. The initial grade had an acrylonitrile content of only 17% instead of approx. 34% in conventional NBR. Whilst non-sulphur-curing systems such as the use of peroxides with triallyl cyanurate or isocyanurate are necessary, the saturated rubber has a number of advantages over NBR. These include improved... 

A substantial improvement in beat resistance may also be obtained by replacing the styrene with triallyl cyanurate Figure 25.6). 

This monomer is prepared by reacting cyanuric chloride with excess allyl alcohol in the presence of sodium hydroxide at 15-20°C. Laminates based on polyester resins containing triallyl cyanurate are claimed to be able to withstand a temperaure of 250°C for short periods. 

Commercial use of triallyl cyanurate is severely limited by the high price and the high curing exotherm of polyester-triallyl cyanurate systems. The exotherm... 

This has led to chemical modification of the polyesters, in particular the introduction of allyl ether groups into the resins. Amongst the monomers figuring prominently in the literature are allyl glyceryl ether I, trimethylolpropane diallyl ether II (1,1-diallyloxypropanol) and pentaerythritol triallyl ether III (2,2,2-trial-lyloxyethanol), as shown in Figure 25.32. 

A polyvinyl alcohol is obtained by suspension polymerization of vinyl acetate and the cross-linking agent, triallyl isocyanurate, with a triazine ring followed by alkali hydrolysis. The polyvinyl alcohol gel is used as packing for gel-... 

DPTS-di-pentamethylene thiuram tetrasulfide TDD-thiodiazoIe derivative NC-fatty acid amide amine B-18-special curative DOTG-dior-tho-tolyl guanidine peroxide 14/40-dicumyI peroxide TAC-triallyl cyanurate. 

The equilibrium contact angles for PE and triallyl cyanurate (TAC) grafted PE with water and formamide are presented in Table 7. The grafting of TAC onto PE increases the surface energies of modified PEs [32]. 

Triallyl monomers [e.g. (21) or salts thereof] can potentially undergo two successive intramolecular cyclizationsX15 1 However, in practice these materials give insoluble products. 

The first cyclization gives a mixture of cis- and from -isomers and only the cis-isomer goes on to give bicyclic products. The relatively slow rate of the second cyclization step, and the formation of rrou.s-product which does not cyclize, provides an explanation for the observation that radical polymerizations of triallyl monomers often give a crosslinked product. 

Previously described <1986IZV1451> THF-2-methyl-l-boraadamantane 15 was prepared starting from triallyl-borane and 3-methoxybut-l-yne (135-140 °C) followed by treatment of the reaction mixture with methanol (Scheme 3). Hydroboration of 3-methoxy-7-(l-methoxyethyl)-3-borabicyclo[3.3.1]non-6-ene 22 thus obtained (73%) with THF-borane lead to racemic THF-2-methyl-l-boraadamantane 15 which was isolated by vacuum distillation <2003MC121>. 

However, the classical version of the ABAC, when triallyl-, trimethallyl-, or tricrotylborane are involved in the reaction with RR1CHC=CH (e.g., propargylic ethers), can be applied only for the synthesis of 1-boraadamantane derivatives 35, 3,5-dimethyl- 36 and 4,6-dimethyl-l-boraadamantanes 37 (Scheme 7). Hence, the stmctures of the final cage compounds are rigidly restricted by the stmctures of the starting allylic boranes. 

Strips of naturally-coagulated rubber removed from the tapping cut, vertical channels and spout prior to making the next tapping. The rubber is washed, dried, creped and sold as blanket crepe. Triallyl Cyanurate... 

Thus, a semilogarithmic plot of the gel time as a function of 1/T should be linear, with the slope corresponding to the apparent activation energy. We have determined the gel times for a temperature range of 25°-50° C for a thiol-ene system consisting of stoichiometrically equivalent amounts of a trifunctional thiol, trimethylolpropane tris(2-mercaptoacetate), and a trifiinctional allyl monomer, triallyl isocyanurate. In this system, we also added 0.31% by weight of hydroquinone, to prevent premature polymerization, and 1.0% by weight of a commercial photoinitiator, Esacure TZT. 

Figure 6. The semilogarithmic plot of gel times as a function of 1/T for the trimethylolpropane tris(2-mercaptoacetate)/triallyl isocyanurate system is used to determine the apparent activation energy. From the slope, the apparent activation energy was found to be 6.6 kcal/mol.

Triallyl cyanurate (TAC), 2 265-267 Triallyl isocyanurate (TAIC), 2 265-267 Triallyl isocyanurate (TAIC), 5 204 Triaminotriethylamine molecular formula, 5 712t... 

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