Mixed substituent poly[(vinyloxy)cyclotriphosphazenes]

Abstract

The mixed substituent cyclophosphazene monomers N 3 P 3 Cl 4 (OCH¼ ¼CH 2 )(OCH 2 CF 3 ) (2) and N 3 P 3 Cl 3 (OCH¼ ¼ CH 2 ) (OCH 2 CF 3 ) 2 (3) undergo polymerization under radical initiation conditions to yield the mixed substituent poly [(vinyloxy)cyclotriphosphazenes] [CH 2 CH(ON 3 P 3 Cl 4 (OCH 2 CF 3 ))] n (5) and [CH 2 CH(ON 3 P 3 Cl 3 (OCH 2 CF 3 ) 2 )] n (6), respectively. A significant, progressive reduction in molecular weight compared to the parent polymer of the series [CH 2 CH(ON 3 P 3 Cl 5 )] n (4) was observed and attributed to increased chain transfer. The thermal decomposition of 5 and 6 is similar to that observed for 4 with an exothermic elimination of HCl at modest temperatures. An alternative synthetic pathway involving nucleophilic substitution reactions of 4 provided [CH 2 CH(ON 3 P 3 (OCH 2 CF 3 ) 5 )] n (7),

Water-triggered self-assembly polycondensation for the one-pot synthesis of cyclomatrix polyphosphazene nanoparticles from amino acid ester

“…7,8 However, preparation of the linear polyphosphazenes is difficult, the conventional ring opening polymerization route from hexachlorocyclotriphosphazene (HCCP) requires harsh synthesis conditions (250 1C in vacuum), and the obtained polymer possesses a wide molecular weight distribution (PDIs E 10). [9][10][11] Despite intensive efforts in pioneering studies, [12][13][14] mass preparation of the linear polyphosphazenes has not been achieved. Recently, Tang et al developed a new class of polyphosphazene, i.e.…”