MST was founded to scale up and develop the chemistry of polyphosphazenes, which contain a polymer backbone of alternating phosphorus and nitrogen atoms and two organic, organometallic, or inorganic side groups attached to each phosphorus atom.

Polyphosphazenes have a degree of polymerization up to 15,000 repeating units with molecular weights of 1-4 million. Polyphosphazenes can be synthesized with various structures including star-shaped structures. Moreover, block copolymers of polyphosphazenes with organic polymers or polysiloxanes, cyclolinear species, and graft or comb macromolecules have also been synthesized. In the literature, more than 700 different polyphosphazenes have been described, and superior properties that cannot be obtained from classical macromolecules have been achieved.