Diallylic terephthalate

Theoretical calculations to predict the conversions at which gelation of polyfunctional monomers occur are reviewed in reference 40. The gelations of DAP, DAIP, and diallyl terephthalate (DATP) near 25% conversion are Httle affected by conditions and are much higher than predicted. 

Diallyl terephthalate [1026-92-2] is utilized less, but lenses made of copolymers with triaHyl cyanurate and methacrylates have been suggested (62). Diallyl tetrabromophthalate and tetrachlorophthalate polymers have been proposed for electronic circuit boards of low flammabiUty (63). They are uv-curable and solder-resistant. Copolymers with unsaturated polyester, vinyl acetate and DAP have been studied (64). 

Diallyl isophthalate (DAIP), 2 258, 261 physical properties of, 2 258t thermoset molding properties of, 2 262t Diallyl phthalates (DAP), 2 258-263 20 110 copolymerization, 2 259-260 Diallyl terephthalate (DATP), 2 259 DIALOG file, 18 246 DIALOG OneSearch, 18 244 -dial suffix, 2 58 Dialysate, 26 814, 815 composition of, 26 817 Dialysis. See also Hemodialysis alternative modes of, 26 832-833 requirements for adequate, 26 821-822 treatment time and frequency of, 26 833-834... 

In dilute solution, it was found that even diallyl terephthalate was capable of undergoing intramolecular cyclization. In general, with decreasing monomer concentration in a solvent, such as benzene, the possibility of cyclopolymerization increases [45]. 

The diallyl esters of o-phthalic and of isophthalic acids are commercially available both as monomers and as low-molecular-weight prepolymers. Diallyl terephthalate has been studied only occasionally. Diallyl chlorendate is of... 

The isolation of the prepolymer from the reaction mixture usually involves its precipitation with an alcohol or some other nonsolvent. Two Japanese patents are based on this well-known phenomenon. In one, 100 gm of a prepolymer solution containing 25% of the prepolymer is treated at 40°C with 200 gm of ethanol in an extractor operating at 200 rpm for 5 min. After a second extraction at 65°C for 5 min with 240 gm of ethanol, 25 gm of the white prepolymer is isolated. Propanol, isobutanol, and isopropanol may also be used. The process is also applicable to poly(diallyl isophthalate) [94]. For poly(diallyl terephthalate) the use of methanol at 40°C followed by a second extraction with methanol at 65°C is patented [95]. 

Application of diallyl terephthalate as an accelerator for curing fluorinated polymers such as a terpolymer of tetrafluoroethylene, vinylidene fluoride, and perfluoropropylene [123]. 

By copolymerization of the aliphatic CR 39 with diallylic terephthalate it is possible to design any optical plastic with refractive indices between 1.57 for the pure aromatic polymer and 1.49 for the pure aliphatic CR 39 (Figure 1). 

Figure 1. Refractive indexes of copolymers of diallylic terephthalate and CR 39...

We found the solution to the problem in the copolymerization with diallylic terephthalate. The formation of network bonds with this monomer gives the possibility, that the tractive power can affect at both ends of the aromatic rings and pull them into its direction (Figure 7). 

Figure 8. Birefringence of copolymers of diallylic terephthalate (DATP) with methyl methacrylate...

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