抄録
Intrinsic viscosity of several kinds of cellulose nitrates in acetone was measured related to its degree of nitration and degree of polymerisation by osmotic method. The following observations are made:
(1) _??_η_??_=K.P_??_ is established over a DP range 90-3000.K=1.95×10-3, α=0.91, (N%=ca 13.8%, 20°C, c: g/l)
(2) K is constant indepedent of their degree of nitration. α varies with their degree of nitration (N%) and the following relations were obtained:(a) Over N%=11 α=0.835 N2-0.162N+1.553 (b) Over N%=12 α=0.93-0.055(14.14-N) K=1.95×10-3
(3) Influence of degree of nitration on the flex angle of cellulose nitrate molecules was calculated from Nukushina-Sakurada's viscosity formula of slightly crooked linear molecule. Sine of flex angle varies with the degree of nitration in the same tendency as in α.
