Summary
A series of poly(oxymethylene-co-dimethylsiloxane) copolymers were synthesized in the molten state by cationic ring opening copolymerization of trioxane and octamethylcyclotetrasiloxane by using trifluoromethanesulfonic acid (triflic acid; CF3SO3H) as initiator. When the concentration of the oxymethylene comonomer units (-OCH2-) in the copolymers are very high, crystalline copolymers are obtained. If the concentration of the dimethylsiloxane co-units (-OSi(CH3)z-) increases, rubberlike materials are obtained. Reaction mechanisms are proposed to explain the growth of the copolymer chains. FTIR and NMR studies suggest the existence of block copolymers and block copolymers with random segments. Thermomechanical characterization of the copolymers was also carried out. This new synthetic method allows us to obtain linear copolymers containing both oxymethylene and dimethylsiloxane comonomer units in the main chain. The copolymerization of these cyclic monomers was demonstrated.
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Rodríguez-Baeza, M., Zapata, M. Synthesis and characterization of copolymers obtained from 1,3,5-trioxane and octamethylcyclotetrasiloxane by triflic acid initiator. Polymer Bulletin 36, 173–180 (1996). https://doi.org/10.1007/BF00294903
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DOI: https://doi.org/10.1007/BF00294903