Tetramethylene dimethacrylate

Fig. 4.2. Selectivity of polymers as a function of the type and amount (X) of cross-linking agent [17]. The polymers were prepared in the presence of 1 with various proportions of the cross-linking agents (a) EDMA, (b) tetramethylene dimethacrylate, and (c) DVB. After removal of the template la, the separation factor a = Xd/Xl was determined for the resolution of D,L-la in a batch process.

Fig. 11 Influence of the proportion of crosslinker on the recognition specificity of MIPs. The crosslinkers represented are ethylene glycol dimethacrylate (EGDMA), tetramethylene dimethacrylate (TMDMA) and divinyl benzene (DVB) (adapted from [94])...

The reluctance of acrylic monomers to polymerise in the presence of air has been made a virtue with the anaerobic acrylic adhesives. These are usually dimethacrylates such as tetramethylene glycol dimethacrylate. The monomers are supplied with a curing system comprising a peroxide and an amine as part of a one-part pack. When the adhesive is placed between mild steel surfaces air is excluded, which prevents air inhibition, and the iron present acts as a polymerisation promoter. The effectiveness as a promoter varies from one metal to another and it may be necessary to use a primer such as cobalt naphthenate. The anaerobic adhesives have been widely used for sealing nuts and bolts and for a variety of engineering purposes. Small tube containers are also available for domestic use. 

Materials. The polyurethane precursor materials were Adiprene L-lOO (Uniroyal, Inc.), a poly(oxytetramethylene glycol) capped with toluene diisocyanate, eq. mol. wt. 1030 1,4-butanediol (BD) and 1,1,1-trimethylolpropane (TMP) and, as catalyst, dibutyltin dilaurate (DBTDL). Acrylic precursors included n-butyl methacrylate (BMA), washed with 10% aq. NaOH to remove inhibitor tetramethylene glycol dimethacrylate (TMGDM) crosslinker and benzoin sec-butyl ether (BBE) as a photosensitizer. These materials were dried appropriately but not otherwise purified. 

The most important method for the synthesis of star polymers by GTP involves the use of a diftmctional monomer either as an arm-first or as a core-first approach. Usually, EGDM is used as the difunctional monomer. However, other multifunctional monomers, such as tetramethylene glycol dimethacrylate, trimethylol propane trimethacrylate, and 1,4-butylene dimethacrylate have been used. 

Jap. 78 31,898 1978 Nitto Elec. Ind. 89 198769 Bu Acrylate - acrylic acid copolymer, rosin ester, tetramethylene glycol dimethacrylate - UV. 

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