Phosphonylated polysiloxanes: poly(diethylphosphonobenzyl-αβ-ethylmethylsiloxane) (PPEMS), copolymers with dimethylsiloxane (poly(PEMS-co-DMS)) and monomer MPECS were studied. Thermal analysis revealed an increase of the Tg with phosphonylation; \DeltaCpTg characteristic of the …