Aliphatic epoxy

Aliphatic Glycidyl Ethers. Aliphatic epoxy resins have been synthesized by glycidylation of difunctional or polyfunctional polyols such as a 1,4-butanediol, 2,2-dimethyl-l,3-propanediol (neopentyl glycol), polypropylene glycols, glycerol, trimethylolpropane, and pentaerythritol. 

Multidentate V-heterocyclic ligands, thorium and, 24 767 Multidimensional gas chromatography, 4 617-618 6 433-434 Multidrug resistant bacteria, 18 252 Multi-effect distillation (ME), 26 65—67 Multi-effect vapor-compression submerged-tube desalination plant, 26 70 Multielevation piperacks, 19 515 Multifeed fractionation, 10 616 Multifilamentary superconductor, 23 846 Multifilament sutures, 24 218 threads for, 24 207 Multifilament yarns, 11 177-178 Multifile patent searches, 18 244 Multifunctional aliphatic epoxies, 10 376 Multifunctional coatings, 1 714-716 Multifunctional epoxy resins, 10 367-373, 418, 454... 

Several other epoxy resins have been made. Many contain glycidyl ether group while others are cyclic aliphatic epoxies and acrylic aliphatic epoxies. 

Epoxy acrylates. The most widely used oligomers are aromatic and aliphatic epoxy acrylates. Epoxy acrylates are highly reactive and produce hard and chemically resistant films. The polymerization of monoacrylates produces linear polymers,... 

Dian resin, modified by aliphatic epoxy resin 100 140-150 binder Binder for reinforced plastics... 

Conclusions on p Transition Motions in Pure Aryl-aliphatic Epoxy Resins... 

The dynamic mechanical results and the solid-state 13C NMR measurements lead to a deeper insight of the motions occurring below the glass transition temperature in the considered pure aryl-aliphatic epoxy networks, in particular those involved in the p transition of these systems, and the nature of their cooperativity. 

Dynamic mechanical analysis and the 13C NMR experiments performed on pure aryl-aliphatic epoxy networks, as well as on antiplasticised systems, have led to a deeper insight into the molecular motions involved in the glassy state of these epoxy resins. 

It appears that the nature of the cooperativity that develops in aryl-aliphatic epoxy resin is similar to that encountered in bisphenol A polycarbonate a cooperativity directly involving the local interchain packing, which... 

Finally, it is interesting to point out that, whereas for poly(ethylene tere-phthalate), bisphenol A polycarbonate and the aryl-aliphatic copolyamides (Sects. 4 to 6, respectively), the phenyl ring flips plays an important role in the p transition processes. In the case of the aryl-aliphatic epoxy networks such 7t-flips exist but they are only indirectly involved in the [J> transition. 

Two types of epoxy resins are formed by this process (1) cycloaliphatic resins and (2) aliphatic resins. Of the many structures that can be synthesized by this process, the cycloaliphatic diepoxies offer the most interesting combination of properties. However, the aliphatic epoxy resins have the greatest utilization in epoxy adhesive formulation. 

The aliphatic epoxy resins formed from reaction with hydrogen peroxide or peracetic acid include epoxidized polybutadiene, epoxidized soya or linseed oil, and epoxidized polyglycols. The resulting products have too low a functionality for use as base polymers. They are almost always used in combination with other epoxy resins to improve properties such as cure rate, flexibility, and heat deflection temperature. Therefore, these resins are often considered to be reactive diluents and flexibilizers. 

Glycidyl ethers of aliphatic polyols based on polyglycol, glycerin, and other polyols are flexible epoxy resins. They are used as reactive diluents and flexibihzers for solvent-free epoxy resin formulations. Epoxy-polyglycol resins that are produced from the reaction of epichlorohydrin and polyester polyols based on ethylene or propylene oxide are the most common of these types of flexible epoxy resins. Examples of typical commercial aliphatic epoxy resins are shown in App. C. 

Aliphatic epoxy acrylates Several varieties are available as difunctional and trifunctional or higher. The difunctional types have good flexibility, reactivity, adhesion, and very low viscosity. Some difunctional types can be diluted with water. The trifunctional or higher types have moderate viscosity and poor flexibility but excellent reactivity. Aliphatic epoxy acrylates have higher cost than die aromatic epoxy acrylates and are generally used in niche applications. 

Epoxy acrylate oligomers that are used in uv/EB curing are very low-viscosity systems with high vapor pressures. Within this group of oligomers, there are several major subclassifications aromatic difunctional epoxy acrylates, acrylated oil epoxy acrylate, novolac epoxy acrylate, aliphatic epoxy acrylate, and miscellaneous epoxy acrylates. Characteristics of these various classes are summarized in Table 4.8. 

Union Carbide developed cyclo-aliphatic epoxies via peracetic add synthesis. 

Cycloaliphatic, amidoamine, and aliphatic epoxy curing com pounds... 

A research team led by O. Figovsky synthesized aliphatic multifunctional cyclic carbonates from corresponding epoxies and carbon dioxide and NIPUs based on them [17,18], The authors tested some compositions polyfunctional carbonates synthesized in the laboratory, namely trimethylolpropane tricyclocarbonate (TMPTCC) and chlorine-contained aliphatic tricyclocarbonates (on the base of chlorine-contained aliphatic epoxy resins Oxilin ) and various diamines 2-methylpentam-ethylene diamine (MPMD), Dytek A, Invista Co. meta-xylenediamine (MXDA), Mitsubishi Gas Chem. Co. polyetheramineJeffamineEDR-148, Huntsman Co. and diethylenetriamine (DETA), D.E.H. 20, Dow Chemical Co. The properties of these materials are shown in Table 4.1. 

Schroeder. J., Madsen, P., and Foister, R., Structure-property relationships for a series of crosslinked aromatic/aliphatic epoxy mixtures. Polymer. 2d. May. 929-940 (1987). 

The polyether-epoxy flexibilizers which contain epoxy groups along the chain (Scheme 57) impair better mechanical properties of the crosslinked composition in comparison with mixtures of aliphatic epoxy resins and polyether polyols. The improved properties are also obtained using 3,4-epoxycyclohexane-1-carboxylates of polyoxypropylene polyether polyols [38] (Scheme 58). 

Two types of nonglycidyl ether epoxy resins are commercially available cyclic aliphatic epoxies and acyclic aliphatic epoxies. 

Cyclic aliphatic epoxy resins were first introduced in the United States. Some typical examples of commercial materials are 3,4-epoxy-6-methylcyclohexylmethyl-3,4-epoxy-6-methylcyclohexane carboxylate (Unox epoxide 201, liquid) (IX), vinylcyclobexene dioxide (Unox epoxide 206, liquid) (X), and dicyclopentadiene dioxide (Unox epoxide 207, solid) (XI). 

Acyclic aliphatic resins differ from cyclic aliphatic resins in that the basic structure of the molecules in the former is a long chain, whereas the latter, as shown, contains ring structures. Two types of acyclic aliphatic epoxies are commercially available, namely, epoxidized diene polymers and epoxidized oils. 

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