Dimethacrylate ethylene glycol

Acryhc stmctural adhesives have been modified by elastomers in order to obtain a phase-separated, toughened system. A significant contribution in this technology has been made in which acryhc adhesives were modified by the addition of chlorosulfonated polyethylene to obtain a phase-separated stmctural adhesive (11). Such adhesives also contain methyl methacrylate, glacial methacrylic acid, and cross-linkers such as ethylene glycol dimethacrylate [97-90-5]. The polymerization initiation system, which includes cumene hydroperoxide, N,1S7-dimethyl- -toluidine, and saccharin, can be apphed to the adherend surface as a primer, or it can be formulated as the second part of a two-part adhesive. Modification of cyanoacrylates using elastomers has also been attempted copolymers of acrylonitrile, butadiene, and styrene ethylene copolymers with methylacrylate or copolymers of methacrylates with butadiene and styrene have been used. However, because of the extreme reactivity of the monomer, modification of cyanoacrylate adhesives is very difficult and material purity is essential in order to be able to modify the cyanoacrylate without causing premature reaction. 

Third Monomers. In order to achieve certain property improvements, nitrile mbber producers add a third monomer to the emulsion polymerization process. When methacrylic acid is added to the polymer stmcture, a carboxylated nitrile mbber with greatly enhanced abrasion properties is achieved (9). Carboxylated nitrile mbber carries the ASTM designation of XNBR. Cross-linking monomers, eg, divinylbenzene or ethylene glycol dimethacrylate, produce precross-linked mbbers with low nerve and die swell. To avoid extraction losses of antioxidant as a result of contact with fluids duriag service, grades of NBR are available that have utilized a special third monomer that contains an antioxidant moiety (10). FiaaHy, terpolymers prepared from 1,3-butadiene, acrylonitrile, and isoprene are also commercially available. 

Dissolved in water and extracted with -heptane to remove ethylene glycol dimethacrylate (checked by gas-liquid chromatography and by NMR) and distilled twice under reduced pressure [Strop, Mikes and Kalal J Phys Chem 80 694 1 976]. 

EGDM-ethylene glycol dimethacrylate HQ-hydroquinone Mod(3)-300% Modulus. 

Glycol methacrylates (and retention times [RTs]) ethylene glycol dimethacrylate (RT = 13 min), diethyleneglycol dimethacrylate (RT = 18 min), triethylene glycol dimethacrylate (RT = 22 min), and tetraethylene glycol dimethacrylate... 

One of the calculation results for the bulk copolyroerization of methyl methacrylate and ethylene glycol dimethacrylate at 70 C is shown in Figure 4. Parameters used for these calculations are shown in Table 1. An empirical correlation of kinetic parameters which accounts for diffusion controlled reactions was estimated from the time-conversion curve which is shown in Figure 5. This kind of correlation is necessary even when one uses statistical methods after Flory and others in order to evaluate the primary chain length drift. 

In more complex forms of this resin hybrid, other dimethacrylates may be present, such as the ethylene glycol dimethacrylates, and bis-GMA, when HEMA acts as a co-solvent for water and bis-GMA (Antonucd, McKinney Stansbury, 1988). The general composition of these materials, which we term class I hybrids, is summarized below ... 

Other difunctional hydroxy dimethacrylates, e.g. the ethylene glycol dimethacrylates... 

OVS tube t-Butyl acrylate. Ethylene glycol-dimethacrylate... 

Ethylene glycol dimethacrylate EGDMA Elydrophobicity Wettability... 

TP Davis, MB Hughn, DCF Yip. Properties of poly(N-vinyl-2-pyrrolidone) hydrogels crosshnked with ethylene glycol dimethacrylate. Polymer 29 701-706, 1988. 

S Wisniewski, SW Kim. Permeation of water-soluble solutes through poly(2-hydroxyethyl methacrylate) and poly(2-hydroxyethyl methacrylate) crosslinked with ethylene glycol dimethacrylate. J Membrane Sci 6 299-308, 1980. 

During the past 25 years, Funke and co-workers have extensively studied the emulsion polymerization of divinyl monomers alone including 1,4-DVB and ethylene glycol dimethacrylate (EDM A) under various reaction conditions. They found that the intraparticle crosslinking changes drastically the classical picture of emulsion polymerization. 

The Effect of Crosslinker Concentration on the Rate of Polymerization. Ethylene glycol dimethacrylate is used most frequently as the crosslinker for HEMA formulations useful in contact lens manufacturing. To demonstrate the effect of crosslinker concentration on the curing rate, formulations derived from HEMA/Glycerine/BME at 85/15/0.17, while varying EGDMA (from 0.34 to 0.68), the peak times were about the same (3.73 and 3.61 minutes respectively). This is reasonable due to the similarity in molecular structure of the crosslinker and the monomer, and the low amount of crosslinker used. The possible presence of other crosslinker, such as the dimerization product of HEMA, is even less a factor to be considered in polymerization kinetics, due to low concentration (normally much less than 0.1 %, in-house information). 

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