Triacrylate

Photopolymerizable compositions based on monomeric acryflc or other ethylenicaHy unsaturated acid derivatives are becoming increasingly popular. When multiftmctional derivatives are employed, three-dimensional networks having high strength and abrasion resistance are possible on exposure to light. A typical composition may contain an ethoxylated trimethylolpropane triacrylate monomer, a perester phenacjhdene initiator (69), and an acryflc acid—alkyl methacrylate copolymer as binder. 

C H NO, and drying oil acid amides with hexamethoxymethylmelamine [3089-11-OJ, C H qN O, (23,24), and trimethylolpropane triacrylate [37273-47-17, been recommended. Such reactive diluents give solutions of higher viscosity, ie, lower alkyd concentration at the same... 

Polyisoprene can be UV or e-beam cured [43,44]. The 3,4 units are particularly prone to crosslinking at low dose [45]. SIS and SBS are also crosslinkable, even conventional linear materials with low vinyl content however, small amounts of liquid trithiol or triacrylate compounds speed cure dramatically [44]. Like UV, e-beam cure is strongly affected by tackifier choice. Hydrogenated, non-aromatic resins provide much less interference with cure [36,37]. 

PNDA = p-dinitroso diphenyl amine PETA-penta erythritol triacrylate DHBP-peroxy hexane values in parentheses are after aging at 100°C, 72 h. 

The reactive extrusion of polypropylene-natural rubber blends in the presence of a peroxide (1,3-bis(/-butyl per-oxy benzene) and a coagent (trimethylol propane triacrylate) was reported by Yoon et al. [64]. The effect of the concentration of the peroxide and the coagent was evaiuated in terms of thermal, morphological, melt, and mechanical properties. The low shear viscosity of the blends increased with the increase in peroxide content initially, and beyond 0.02 phr the viscosity decreased with peroxide content (Fig. 9). The melt viscosity increased with coagent concentration at a fixed peroxide content. The morphology of the samples indicated a decrease in domain size of the dispersed NR phase with a lower content of the peroxide, while at a higher content the domain size increases. The reduction in domain size... 

FIGURE 31.4 Absorbance of control and EPDMs modified with different trimethylolpropane triacrylate (TMPTA) levels at an irradiation dose of 100 kGy. (From Sen Majumder, P. and Bhowmick, A.K., J. Adhesion Set Technol., 11, 1321, 1997. With permission.)... 

FIGURE 31.10 (a) Plot showing the variation of ahsorhances at 1740 and 1632 cm of the control and the trimethylolpropane triacrylate (TMPTA) mixed nihher irradiated with 20, 50, 100, 200, and 500 kGy. 

Trimethylolpropane triacrylate (TrMPTrA, mw 296.3, Polysciences Inc., Warrington, PA) was mixed with 1 wt% 2,2-dimethoxy-2-phenyl-acetophenone (DMPA, mw 256.3, Aldrich Chemical Co., Milwaukee, WI) as a photoinitiator. For... 

Since the commercially available epoxy acrylate is extremely viscous, it is necessary to thin the formulation with a reactive diluent. A mixture with satisfactory viscosity for brush-on application contains about 45% diluent. Of the diluents tested, TMPTA (trimethylolpropane triacrylate) proved most successful. 

Trimethylolpropane, el 83 Trimethylolpropane triacrylate, el 14 Trimethylolpropane trimethacrylate, el 85 l,3,3-Trimethyl-2-oxabicyclo[2.2.2]octane, c277... 

In order to prepare the samples for dielectric-constant measurements, etherdiacrylate 6 was mixed with a trace amount of AIBN at room temperature in a cylindrical donut mold made from General Electric RTV 11 silicon molding compound. The donuts had an outer diameter of 7.0mm, an inner diameter of 3.0 mm, and a thickness of 3.0 mm the semisolid triacrylate 3 was mixed with a... 

Figure 11.1. FTIR (KBr pellet) spectra of (A) triacrylate 3 and (B) its curing with AIBN at 100°C for...

Since each acrylate group is difunctional, the diacrylates are tetrafunctional while the triacrylates are hexafunctional. For polymerization ofthe polyfunctional monomers at sufficiently high degrees of conversion, the branching must result in the formation of cross-links to give a three-dimensional network. 

Uses. In the manufacture of pentaerythritol tetranitrate alkyd resins in surface-coating compositions pentaerythritol triacrylate and protective coatings insecticides pharmaceuticals... 

Fig. 15 Three-dimensional microstructures produced by 2P-initiated radical polymerization of triacrylates using q.ll or r.l as initiators a photonic bandgap structure b close-up view of the structure in (a) c tapered waveguide structure and d array of cantilevers. Reproduced with permission from [21]...

Fig. 17 SEM images of structures fabricated in a triacrylate resin at threshold powers using a 730 nm excitation of r.l and b 520 nm excitation of r.3. The lower panels show the dimensions, transversal to the beam propagation direction, of single lines of the strnc-tures for each excitation wavelength. Reproduced with permission from [179], 2007, Optical Society of America...

---