Lauryl acrylate

Butyl acrylate mixed with t-butyl or lauryl acrylate/ BDAA... 

Ethyl, butyl, hexyl, lauryl acrylate/ BDDA... 

Another successful example is the separation of a series of steroids listed in Fig. 6.11 using a monolithic capillary column prepared by redox initiated polymerization of a solution of acrylamide 4, methylene bisacrylamide 5, vinylsulfonic acid 12, and dodecyl acrylate 18 in N-methylformamide/TRIS-boric acid buffer (pH 8.2) to which polyethylene glycol) (MW 10,000) was added (overall composition 5% T, 60% C, 10% vinylsulfonic acid, 15% lauryl acrylate, 3% polyethylene glycol)). The capillary tube was first vinylized and its part beyond the detection window was coated with linear polyacrylamide to avoid band broadening. Since laser induced fluorescence was used to decrease the detection limit of the method to about 100 attomoles for neutral steroids, all of the analytes were first tagged with dansylhydrazine. Fig. 6.12 shows an... 

Separations of complex steroid mixtures were achieved recently by Que et al. [76] using both isocratic and gradient elution. Mass spectrometric detection gave femto-mole detection limits while laser-induced fluorescence of dansylated ketosteroids ranged in attomole levels (Fig. 10.16). Monolithic column packings were used with a 35 cm (25 cm packed bed) x 100 pm i.d. capillary packed with a polymer prepared from 5% T (total monomer concentration), 60% C (total crosslinker concentration), 3% polyethylene glycol, 10% vinylsulfonic acid and 15% lauryl acrylate. Details of the monolithic column preparation can be found in refs. 36,76, and 193. Similar monolithic columns can be used for the separation of bile acids [194],... 

Materials. Lauryl acrylate was freed of inhibitor by three separatory funnel extractions with 5/f sodium carbonate solution, three deionized water washings, followed by three crystallizations from methanol. Residual methanol and water were removed by 24 hour sparging with nitrogen at room temperature. Both original (inhibited) and purified lauryl acrylate (LA) were polymerized. 

The results of peroxide initiated and Trigonal 14 photoiniti-ated polymerizations of lauryl acrylate (LA), I,6-hexanediol diacrylate (HDDA), neopentyl glycol diacrylate (NPGDA), and trimeth-ylol propane triacrylate (TMPTA) will first be presented. These experiments were designed to observe total heats of polymerization under prescribed conditions. The results of more extensive rate studies on Trigonal 14 photolnitlated LA polymerizations will then follow. 

Lauryl Acrylate Polymerization by Photo-activated Trigonal 14 Initiation. A more extensive preliminary study of the capability of calorimetry to follow rapid photopolymerization reactions was made of the kinetics of LA polymerization initiated by photo-activated TR-14. 

Figure 2. Photopolymerization exotherm trace. Rate of sample heat change vs. time at 40° C. Photoactivated Trigonal 14 initiation of lauryl acrylate polymerization.

Initiator Concentration Effect Lauryl Acrylate Photopolvinerization... 

Figure 3. Temperature dependence of —dH/dt exotherm rate at peak for lauryl acrylate containing 0.989 gm gm of Trigonal 14 (cf. Table II). Upper points at 16.7 meal cm sec total light intensitu lower points at 0.88 meal cm sec total light intensity.

Figure 4. Dependence of —dH/dt exotherm rate at peak on initial Trigonal 14 concentration in photopolymerizations of lauryl acrylate. , 800 - - W, inhibited monomer, T = 52°C, DSC-IB O, 800 - -W,T — 30° (Series TV) 40aW. T = 40°C (Series V) C, 400W, 0.1 neutral density filter, T — 40°C ("Scries VI).

Figure 5. Total heat oj reaction, — plotted against initial T otud 14 concentration, C, for lauryl acrylate polymerizations Table III). , Series W , Series V O, Series VI t). Series VII.

Summary. The foregoing sections lead to the conclusion that for the photo-activated Trigonal 14 polymerization of lauryl acrylate, the rate of polymerization may be approximately expressed as... 

Although the foregoing information was obtained on lauryl acrylate Initially equilibrated with air and initiated by a complex commercial photo-initiator, it Is still profitable to compare... 

Figure 6. Exotherm rate at peak, —dH/dt (peak), vs. irwident light intensity for photoactivated Trigonal 14 initiated lauryl acrylate polymerizatiorts (cf. Table IV). , Series VIII O, Series IX and Series X.

Figure 8. Exotherm rates, (—dH/dt)tx, vs. residual polymerization heats, Hg(tj.), for Series V lauryl acrylate polymerizations. Points correspond to 0.2, 0.3, 0.4, etc., fractional conversions for each run based on its total —AH,.

Polymerization Rate Dependence on Residual Polymerization Heat Lauryl Acrylate Photopolymerization... 

Lauryl acrylate polymerizations initiated by a photo-activated mixture of benzoin butyl ethers (Trigonal 14) were performed in Perkln-Elmer model DSC-IB and DSC-2 apparata modified by attachment of a heat-filtered medium pressure mercury lamp. Within specified variable limits, the rate of polymerization may be approximated by the relation Rp = const. 0.55 q0.35 2m]. 6 -316/T I js light intensity C is initiator concentration CM] is monomer concentration T is absolute temperature. 

Acrylic acid, dodecyl ester A13-03198 Oodecyl acrylate n-Dodecyl acrylate EINECS 218-463-4 Lauryl acrylate n-Lauryl acrylate NSC 24177 2-Propenolc acid, dodecyl ester. UV-curable reactive diluent in inks and coatings, adhesives, viscosity index improver, finishing aid for leather. Solid d = 0.884. Rit-Chem Sartomer. 

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