1,6-Dimethacrylate hexane

Scheme 4 Nucleophilic reaction for the addition of 2-mercaptoethanol onto 1,6-dimethacrylate hexane catalyzed by triethylamine (N( t)3)...

Synthesis. Functionalized monomers (and oligomers) of sebacic acid (SA-Me2) and 1,6 -bis(/ -carboxyphenoxy)hexane (CPH-Me2) were synthesized and subsequently photopolymerized as illustrated in Figure 1. First, the dicarboxylic acid was converted to an anhydride by heating at reflux in methacrylic anhydride for several hours. The dimethacrylated anhydride monomer was subsequently isolated and purified by dissolving in methylene chloride and precipitation with hexane. Infrared spectroscopy (IR), nuclear magnetic resonance (NMR) spectroscopy, and elemental analysis results indicated that both acid groups were converted to the anhydride, and the double bond of the methacrylate group was clearly evident. 

SMMA copolymers in the composition range 19-76 mol % MMA could be separated on a 500 x 7.5 mm column packed with crosslinked copolymer from acrylonitrile and ethylene dimethacrylate. A gradient n-hexane/chloroform (exponentially from 35 to 85 %) allowed five specimens with 19,44, 62, and 76 mol % methyl methacrylate to be separated 45 K... 

The previous concepts may be illustrated with the experimental determination of the evolution of reaction rate, measured by DSC at T = 60°C, for the copolymerization of methyl methacrylate (MMA) with variable amounts of ethylene glycol dimethacrylate (EGDMA), a vinyl-divinyl system (Sun et al., 1997). The reaction was initiated with 2,5-dimethyl-2,5-bis(2-ethylhexanoyl)peroxy hexane. 

A monolithic hydrophobic polymer formed by photoinitiated polymerization for on-chip solid-phase extraction is shown in Figure 5.6. The polymer mixture includes butyl methacrylate (BMA) and ethylene dimethacrylate (EDMA), with the pore size controlled by the composition of the hexane/methanol porogenic mixture. The degree of pre-concentration depends on the flow rate, as shown in the pre-concentration of GFP at three flow rates (see Figure 5.7). The factors of pre-concentration were 355, 756, and 1002 for the flow rates of 3, 1.03, and 0.53 rE/min, respectively [342]. 

Cholesteryl 4-vinylphenyl carbonate was synthesized by reacting 4-vinylphenol (obtained by hydrolyzing 4-acetoxystyrene) and cholesteryl chloroformate (commercially available) in dry THF. To the mixture of this carbonate ester (5 mol%) and ethylene glycol dimethacrylate (95 mol%) in hexane (2 mL/g, solvent/monomers), was added AIBN (1 mol% with respect to the C=C bonds). The solution was degassed and sealed at a reduced pressure. The polymerization was carried out at 65 °C for 24 h. The resulting polymer was washed with methanol, ground (average size 30 pm), extracted with methanol in a Soxhlet apparatus for 12-18 h, and dried in vacuo. In order to hydrolyze the carbonate esters, the polymer particles were suspended in 1 M NaOH/ methanol. After the suspension was refluxed for 6 h, it was added to dilute hydrochloric acid and filtered. The polymer was further washed with water, methanol, and ether, extracted with methanol and then with hexane, and finally dried in vacuo [3]. 

Several SP materials have been used for the extraction of FRs from aqueous samples, plasma and milk (Table 31.7). Similar materials have been used for all FRs. Typical SP materials include Ci8 and Cg bonded to porous silica, highly cross-linked poly(styrene divinylbenzene) (PS-DVB), and graphitized carbon black (GCB). It is also possible to use XAD-2 resin for extraction of various FRs, pesticides, and plastic additives from large volumes of water (100 1). The analytes can then be either eluted from the resin by acetone hexane mixture, or Soxhlet extracted with acetone and hexane. For a specific determination of diphenyl phosphate in water and urine, molecularly imprinted polymers have been used in the solid phase extraction. The imprinted polymer was prepared using 2-vinylpyridine as the functional monomer, ethylene glycol dimethacrylate as the cross linker, and a structural analog of the analyte as the template molecule. Elution was done with methanol triethylamine as solvent. Also solid phase microextraction (SPME) has been applied in the analysis of PBDEs in water samples. The extraction has been done from a headspace of a heated water sample (100°C) using polydimethylsiloxane (PDMS) or polyacryl (PA) as the fiber material. ... 

Dimethyl-2,5-di (t-butylperoxy) hexane m-Diviny I benzene PEG dimethacrylate Triallyl trimellitate... 

The thermal stability of copolymers of long-chained diol dimethacrylates was investigated [583]. These copolymers included 1,4-butane-, 1,5-pentane-, 1,6-hexane-, 1,8-octane-, 1,10-decane-, or 1,12-dodecanediol dimethacrylates, respectively, as well as 2,2-bis[4-(2-hydroxy-3-methacryloyl-oxypropoxy)-phenyl]propane and triethylene glycol dimethacrylate. The polymers were found to be thermally stable up to 250°C, as shown by the initial decomposition temperature and then-degradation profiles. 

A mixture of six SBR samples containing styrene ranging between 11 mol% and 82 mol% was separated with a mixed solvent of hexane and chloroform on a column of acrylonitrile-ethylene dimethacrylate gel [73]. With increasing chloroform content in the mobile phase, copolymers were eluted from the... 

The termination mechanism during the photopolymerization of hexane-1,6-dioI dimethacrylate in various polymeric binders depended on the type of matrix used [19]. In matrices with Tg values above room temperature, the first order mechanism dominated (the reaction was carried out at 25 C in air). For instance, the values in poly(vinyl pyrrolidone) remained practically constant in the conversion range 11-17%. It was indicated that in this case the t, rate coefficient corresponded more to radical trapping, because pseudo fist-order processes [radical scavenger]) are relevant only when... 

Copolymer of methacrylic acid with dimethacrylate of ethylene glycol + 4ml of hexane, 1 4 M1E4H4X - washed with methanol after the synthesis. 

UDMA urethane dimethacrylate or 1,5-di(methacryloyloxyethylcarbamoyl)-3,30,5-trimethyl hexane... 

---