Tetraethyleneglycol diacrylate

Chain Cross-Linking Photopolymerization of Tetraethyleneglycol Diacrylate... 

Network formation by photopolymerization has been studied for tetraethyleneglycol diacrylate (TEGDA) using isothermal calorimetry (DSC), isothermal shrinkage measurement and dynamic mechanical thermal analysis (DMTA). Due to vitrification the polymerization does not go to completion at room temperature. The ultimate conversion as measured by DSC seems to depend on light intensity. This can be explained by the observed delay of shrinkage with respect to conversion. 

One of the aspects of polymer-supported reactions (see Section 4) is the ability to separate reactive centres from each other. The extent to which a benzoin condensation reaction occurs on a crosslinked polymer was examined [45]. The starting material, a polymeric benzaldehyde, was prepared by incorporation of vinyl benzaldehyde into a resin using either divinylbenzene or tetraethyleneglycol diacrylate as a crosslinker. The product was examined using CP/MAS. The spectra showed two important peaks at 86.2, 126.0 and 166.0 ppm. These were attributed to the a-hydroxy carbon, the proton-ated aromatic carbons and the carbonyl carbon of the a-hydroxy ketone. This demonstrated that in the polymer the benzoin condensation reaction had occurred to a significant extent. 

Kloosteiboer J., Lijten G. Cross-Linking Photopolymerization of Tetraethyleneglycol Diacrylate. In Cross-IirUced Polymers, American Chemical Society Washington, DC. 1988. 

Parks [17] described an absorbent polymer prepared by copolymerizing acrylic acid with a divinyl crosslinker such as tetraethyleneglycol diacrylate, at a concentration of about 10% in aqueous solution, with sodium persulfate as initiator at 60 C. The polymer was neutralized with sodium hydroxide and then mixed with a solution of divalent ion salt, such as zinc acetate dihydrate. The product was dewatered with methanol and then oven dried to a solid product. The product was said to exhibit no gel blocking when in contact with water. Gel blocking often occurs with high swelling capacity, low modulus and sticky products. Particles that are first to contact the fluid swell very rapidly and cause lumps with unswollen particles, which swell no further due to reduced water transport through the gel. 

---