Two high molecular weight samples of poly(2-vinylpyridine) (P2VP) designated as 1 and 2 were spontaneously polymerized in diluted or concerntrated sulfuric acid. Their 13C-NMR spectra show that they are atatic polymer. Their intrinsic viscosity (shear rate D=0) molecular weight relationship has been obtained:[η]D=0 = 1.27×10-2 Mw0.70(in DMF

at 25℃

Mw: 2.66 ×10s-10.0× 106). Their highest intrinsic viscosity (in DMF

at 25℃)

which is independent of shear rate

is 260ml/g

and M is about 1.74 × 106. The unperturbed dimension (R2>o/M) of P2VP is 6.08×10-18cm-2g.In DMF parameter B is 1.91×10-27cm-3.