Epoxy functionality

Glycidyl acrylates and methacrylate are generally used to introduce epoxy groups into the polymer  

Glycidyl acrylate is volatile and toxic and finds limited use. Glycidyl methacrylate is much less hazardous and is normally used in preference. Suppliers of these monomers are difficult to obtain outside Japan. 

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Adhesion promoting silanes are often added to improve adhesion to various substrates. As is the case with urethane sealants, silanes with a dual-reactive nature are typically used. Examples of such silanes are mercapto- and epoxy-functional silanes. Organic titanates may also be used. 

Formulated Melamine resin + epoxy-functional silane... 

In primer formulations for adhesive bonding of metals, the coupling agents that are most frequently used are those based on epoxy and amine functionalities. Aqueous solutions of aminosilanes have been successfully used for obtaining stable adhesive bonds between epoxy and steel [10] and epoxy and titanium [11,12], while epoxy functional silanes are preferable for applications involving aluminum substrates [13,14], A simple solution of % epoxy functional silane in water is currently used for field repairs of military aircraft [15] where phosphoric acid anodization would be extremely difficult to carry out, and performance is deemed quite acceptable. 

Carboxylic acids with multifunctional epoxides or epoxy functional monomers... 

Epoxy cured silicones were developed to be photo initiated rather than thermally cured [54]. The chain length of these materials ranges to 200 monomer repeat units, but the majority component of most formulations is significantly shorter. The structure of a typical base polymer is shown in Fig. 4. The chain can be terminal and/or pendant functional, with degree and type of epoxy function-... 

Although chlorine azide and bromine azide tend to give some dihalogen adducts, these reagents have been used in the presence of alcohol, ester and epoxy functions without interference.In the case of 17a-acetoxy-A -progesterone, a selective addition to the 6,7-double bond is obtained. ... 

An example of the use of 1,4-butanediol diglycidyl ether for the activation of soluble dex-tran polymers is given in Chapter 25, Section 2.3. One end of the fezs-epoxide reacts with the hydroxylic sugar residues of dextran to form ether linkages, which terminate in epoxy functionalities. The epoxides of the activated derivative then can be used to couple additional mol-ecules-containing nucleophilic groups to the dextran backbone. 

Modification of dextran polymers with 1,4-butanediol diglycidyl ether results in ether derivatives of the dextran hydroxyl groups, which then contain hydrophilic spacers with terminal epoxy functions (Figure 25.16). 

Figure 25.16 An epoxy-functional dextran derivative may be prepared by the reaction of 1,4-butanediol diglycidyl ether with the hydroxyl groups of the polymer.

Thus, for example, an epoxy functional group in the alcohol part remained intact... 

Tertiary amides bearing epoxide and other labile moieties can be converted to the corresponding ketones (400a and 400b) in good yields, by treatment with alkyl- or aryllithiums followed by the usual quenching with a proton (equation 108). Furthermore, if the quenching is done with a peracid the amide is transformed to an ester (401, equation 109). Both processes leave the epoxy function unscathed. ... 

Several research groups, for instance, reported on the generation of weak anion exchanges by reacting the epoxy functionalities with diethylamine [54-57], The resulting diethylaminoethyl monoliths—which are commercially available as CIM (Convective Interaction Media) in disk and column format—have frequently been used for protein and oligonucleotide separation [58] as well as for the purihcation of proteins and plasmid DNA [59-61]. 

Under non-aqueous conditions the epoxy function in the epoxylactones can be opened only by Lewis acid assistance. Thus, 2-fluoro-2-deoxy-lactones have been prepared from 2,3-epoxylactones by treatment with HF-amine complexes [38,49,50], while 5,6-epoxylactones yield 6-deoxy-6-fluoro-lactones by this treatment [49, 50]. Likewise, BFj-assisted opening of a 2,3- epoxy function with TMSN3 [51] gave a 2-azido-2-deoxy-lactone [52]. In all cases the opening of the epoxide is a frans-opening, and it is noteworthy that under acidic conditions the nucleophile attacks at C-2 or at the primary position, similar to the opening of acetoxonium ions by bromide ions in the... 

Most moisture-curing silicones have good general adhesion to a variety of substrates. However, adhesion can be markedly improved with different combinations of silanes. The more common silane adhesion promoters are categorized as amine functional, eg, 3-aminopropyltrimethoxysilane [13822-56-5]y 3-aminopropyltriethoxysilane [919-30-2] y or IV-(2-aminoethyl)-3-aminopropyltrimethoxysilane [1760-24-3] as epoxy functional, eg, 3-glycidoxypropyltrimethoxysilane [2530-83-8] (2) and 2-3(3,4-epoxycyclohexyl)ethyltrimethoxysilane [3388-04-3] (3) as mercapto functional, eg, 3-mercaptopropyltrimethoxysilane [4420-74-0] or as methacrylate functional, eg, 3-methacryloxypropyltrimethoxysilane [2530-85-0] (4). 

Epoxy-functional polydimethylsiloxane oligomers are another group that can be cured by UV radiation. Epoxysilicone block copolymers exhibit a good photoinitiator miscibility, high cure rate, and compatibility with epoxy and vinyl ether monomers. These block copolymers form flexible films with excellent release properties and are therefore used as release coatings. ... 

Eckert et al. (2) prepared curable dental compositions consisting of epoxy functionalized carbosilane derivatives, (I). Carbosilanes, ( ), were prepared by Chappelow et al. (3) and used in dental matrix resin systems, such as restorative composites. 

Xue, G., Koenig, J. L. The Chemical Reactions of an Epoxy-Functional Silane in Aqueous Solution, paper presented 1983 Ahesion Society Meeting... 

S. Sun, X. Xu, H. Yang, and H. Zhang, Toughening of poly(but-ylene terephthalate) with epoxy-functionalized acrylonitrile-butadi-ene-styrene, Polymer, 46(18) 7632-7643, August 2005. 

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