1.2- Epoxy propane, polymerization

It has been reported previously that bls-trlfluoromethane-sulfonyl methane ("dlsulfone ) and its derivatives are good epoxy homo-polymerization catalysts (11,12). Calorimetric studies have shown that l,l,3,3-tetrakl8(trlfluoro methanesulfonyl) propane ("tetra-sulfone") is probably the only effective catalyst for homopolymerization of an aliphatic epoxide, e.g. butene oxide, in a non-polar solvent at room temperature (Figure 2). The other dlsulfone catalyst along with Bronsted acids are poor catalysts. 

In this work, polyurethane (PU) and epoxy (EP) mixtures were selected for investigation because they are known to form partially miscible IPNs with broad glass transition temperatures. These were first prepared by Frisch et al(6) using a simultaneous polymerization technique in bulk. These materials showed the effects of cross-linking only one polymer component (pseudo-IPN) and intentional grafting between the component polymers. Klempner et al (2) also studied PU/EP IPNs for vibration attenuation. The polyurethanes in this work were chain extended and crosslinked with a 4 1 equivalent ratio of butanediol (BD) and trimethylol propane (TMP). 

EPOXY-3-BUTOXY PROPANE (2426-08-6) C7H14O2 Highly flammable and peroxidizable liquid. Forms explosive mixture with air (flash point 130 F/54°C). Air and light form unstable and explosive peroxides. Violent reaction with strong oxidizers may cause fire and explosions acryl and acid halides. Incompatible with acids, boron trifluoride. Strong caustics may cause polymerization. Attacks some plastics and rubber. On small fires, use dry chemical powder (such as Purple-K-Powder), foam, or COj extinguishers. 

EPOXY-3-HYDROXY PROPANE (556-52-5) Combustible liquid (flash point 158T/ 70°C). Reacts violently with strong oxidizers. Contact with strong acids, caustics, chemically active metals (aluminum, copper, zinc, etc.), metal salts, trichloroethylene, especially in the presence of heat, can cause polymerization or exothermic decomposition. Incompatible with nitrates. Attacks some plastics, rubber, and coatings. 

A sigruficant use is as a catalyst in a multitude of reactions, such as the formation of acrjdic and methacrjdic acid amides from fatty acid amides (81) of cychc ketones such as 4-phen5icyclopentane-l,2-dione and 2,5-dihydroxy-/)-benzoquinone from benzaldehyde diethji acetal and 2,4-dioxo-5,5-dimethoxy-hexanoic acid methyl ester (82) of dimer aldehydes from propane (83) and for the polymerization of epoxy compounds (84). Mag nesium Kthylate. Magnesium ethoxide [2414-98-4]y Mg(OC2H 2 niol wt 114.4, is an almost white hygroscopic powder density,... 

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