1,1,1-Trimethylolpropane trimethacrylate structure

The influence of adding polyfunctional monomers having different structures and functionality into a dicumyl peroxide-based crosslinking system for LDPE was investigated. Monomers employed were diallyl phthalate, trimethylolpropane trimethacrylate and triallyl cyanurate. The effects of formulation on matrix gel content and on foam density at similar gel content were examined and the dependence of foam density on melt modulus assessed. The applicability of swell ratio for estimating foam density was evaluated and the suitability of triallyl cyanurate as a crosslinking promoter for LDPE foam demonstrated. 20 refs. 

The template, the functional monomers and the cross-linking monomers are dissolved in a non-polar solvent. The functional monomers and the template form complexes and the strength of these are reflected in the selectivity of the imprinted polymer. The choice of functional monomer is based on the template structure. Functional monomers are chosen for their ability to interact non-covalently with the template molecule. The most frequently used functional monomer so far is methacrylic acid (MAA). Also vinylpyridines have been frequently used. As cross-linking monomers, ethyleneglycol dimethacrylate (EDMA) or trimethylolpropane trimethacrylate (TRIM) are widely used. Several other types of functional and cross-linking monomers have been used in molecular imprinting experiments using the non-covalent approach. The choice of monomers is of course important to the... 

As shown in Fig. 7.10A, the PLEC was fabricated with a simple sandwiched structure of ITO/polymer/Al. The active layer contained an alkoxyphenyl substituted poly(l,4-phenylene vinylene) (AP-PPV), trimethylolpropane trimethacrylate (TMPTMA), and lithium trifluoromethane sulfonate (LiTf). When a bias voltage was initially applied, the PIN junction was formed by electrochemical doping (Fig. 7.1 OB). At the same time, the ionic conduction channels would be cut off due to the polymerizing of small molecules... 

Photoresponsive molecularly imprinted membranes are based on the ability of cis-trans isomers of the polymers which have azobenzene in their molecular structure to undergo conformational rearrangement reaction, a fact which can be speculated for controlled release applications. Two such systems were developed for the controlled release of caffeine, the first by using 4-[(4-methacryloyloxy) phenylazo]-benzoic acid as a functional monomer and trimethylolpropane trimethacrylate [63], and the second by using 4-[(4-methacryloyloxy) phenylazo] benzenesulfonic add as a functional monomer and N,N - hexylenebismethacrylamide as a crosslinker [64]. In the case of the first system, it was foimd that by irradiation at 365 nm for 120 min, 58% of the active substance is released (in the same time period, by exposine to 440 nm, 94% of the caffeine quantity is released), while for the second system, by irradiation at 353 nm for 120 min, 84% of the caffeine quantity is released (94% by irradiation at 440 nm for 90 min). 

A potential use of this monomer Is In the area of dental fillings In which a slurry containing 20% of very fine crystals of the unsaturated splro ortho carbonate VI In 60% of the adduct of methacrylic acid to blsphenol-A diglycidyl ether (Bls-GMA) plus 20% trimethylolpropane trimethacrylate produces on polymerization a material with essentially no change In volume. An Investigation of a bubble test on tooth enamel showed that this copolymer had nearly double the adhesion to the tooth structure that the base resin had without the addition of the unsaturated splro ortho carbonate. The copolymer also had improved impact strength but yet essentially the same modulus, and filled composites appeared to have somewhat improved abrasion resistance. 

Members of this group include 1,4-butanediol dimethacrylate, BDMA, N=2 1,6-hexanediol dimethacrylate, HDMA, N=3 and 1,10-deca-methylenediol dimethacrylate, DMDMA, N=5. The following individual diluting monomers were also evaluated, neopentyl glycol dimethacrylate, NPGDMA and trimethylolpropane trimethacrylate, TMPTMA. Two high molecular weight monomers based on the bisphenol A structure were evaluated, Bis-GMA and a related dimethacrylate prepared from ethoxylated bisphenol A (EBPADMA). 

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