Epoxy-terminated polydimethylsiloxane

Poly(unsaturated ester)-siloxane segmented copolymers have been prepared by the polycondensation of epoxy-terminated polydimethylsiloxanes and carboxy-terminated poly(ethylene adipate-co-maleate) oligomers 243). Reactions have been conducted in cellosolve solvent, at 140-150 °C, in the presence of 2% by weight potassium hydroxide catalyst. The molecular weights reported were fairly low. The same group has also prepared poly(hexamethylene adipate)-polydimethylsiloxane copolymers con-... 

Figure 1. Effect of Catalyst Concentration on Epoxy Terminated Polydimethylsiloxane Equilibrations (44 hrs. reaction t ime).

Polybutadiene-polydimethylsiloxane segmented copolymers were prepared by the reaction of epoxy-terminated PDMS and carboxy-terminated polybutadienes, in refluxing toluene under catalytic action of potassium hydroxide 243). Molecular weights of the copolymers obtained were usually in the low range. No other characterization data were available. 

Koh Koh, J. S., Kang, D. W., Park, H. S. Synthesis and toughness improvement of amino-ethylpi-perazine terminated polydimethylsiloxane tetrafunctional epoxy resin network. Korea Polym. J. 4 (1996) 39 4. 

PPE-polysiloxane blends have also been compatibilized through copolymer formation between amine-terminated polydimethylsiloxane and either epoxy-functionalized PPE (Blohm et al. 1995) or anhydride-functionalized PPE (Shea et al. 1989). Compatibilized blends have also been formed by extmsion of PPE with epoxy-functionalized polydimethylsiloxane (Celia et al. 2002) and by kneading of anhydride-functionalized PPE with carboxylic acid-functionalized polydimethylsiloxane in the presence of a diamine coupling agent (Moritomi and Iji 2002). 

Compatibilized blends of polyarylene sulfide with epoxy-functimialized polydimethylsiloxane have been prepared by Han (1994). An amine-terminated polysiloxane was functioned in solution with a chloro-epoxy triazine. Blends of 95 5 PPS polysiloxane were extruded at 130-290 °C to provide compositions with markedly improved mechanical properties compared to a similar blend containing unfunctionalized polysiloxane. 

Figure 9 Examples of polydimethylsiloxane resins terminated by either oxirane rings 72 or chemical groups containing labile hydrogen atoms, such as carboxylic acid 68 and aliphatic amine 70. These compounds are synthesized by hydrosilylation of carbon-carbon double bonds using hydrogen-terminated polydimethylsiloxanes 66 as starting reactant. This reaction is also employed to produce epoxy-silicone 74 from allyl-...

Synonyms Poly(dimethylsiloxane-(3-ethylene oxide) methyl-terminated Classification Carbinol-terminated polydimethylsiloxane Uses Reactant for PU, epoxy, polyester, and phenolic systems reactive additive for PU leather finishes reactive internal lubricant for polyester fiber melt spinning surfactant blend agent Regulatory Canada DSL Manuf./Distrib. Chemos GmbH Gelest Trade Names DBE-C25 See also Dimethicone copolyol EO/PO block polymer or copolymer CAS 9003-11-6 (generic) 106392-12-5... 

Uses Reactive additive for urethane leather finishes and in epoxy, polyester, and phenolic systems reactive internal lubricant for polyesterfiber melt processing Manuf./Distrib. ABCR Advanced Tech. Industry Gelest United Chem. Tech. Trade Names Containing Silwet L-7608 Polydimethylsiloxane rubber. See Silicone elastomer Polydimethylsiloxane, trimethylsiloxy-terminated CAS 9016-00-6... 

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