Linear A-B, A-B-A, and B-A-B block copolymers containing polyphosphazenes and polysiloxanes were synthesized and characterized. Two methods were used in the synthesis of these novel block copolymers. The first utilized hydrosilylation chemistry to couple monotelechelic polyphosphazenes with commercially available dihydride-terminated poly(dimethylsiloxane) (PDMS). The second involved the termination of living poly(dichlorophosphazene) chains with phosphoranimine-terminated PDMS. The semicrystalline, hydrophobic copolymers, [(CF3CH2O)2P=N]x -[(Me)2Si-O]y, and the water-soluble copolymers, [(CH3OCH2CH2OCH2 CH2O)2P=N]x-[(Me)2 -Si-O]y, were prepared by the linkage of either hydrophobic or hydrophilic organic groups to the polyphosphazene backbone. These materials, with a polyphosphazene content from 19 to 73 mol % (43-90 wt %) were obtained with controlled molecular weights that ranged from 5600 to 108 900 Da. The syntheses, characterization, and physical properties of the linear polyphosphazene-polysiloxane block copolymers are reported.
All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry