セルローズーP. M. M. A.グラフトポリマーの動的特性

抄録

Dynamic properties of cellulose-P. M. M. A. graft polymer were investigated. P. M. M. A. was graft-polymerized onto cellophane in the Redox system using Ce⁺⁴ as catalyst.
Dynamic modulus decreases and tan δ increases with the increase in graft ratio. Dynamic loss increases and again decreases with the increase in graft ratio.
Dynamic modulus of the graft samples was verified by the following equation.
Where E_g′, E_c′ and Ep′ are dynamic modulus of the graft sample, cellulose and P. M. M. A. component, respectively. v_c and v_p are volume fraction of cellulose and P. M. M. A. component.
At lower graft ratio, Ep′ takes much higher value than that of ordinary P. M. M. A. and takes comparatively reasonable value at high graft ratio.
These results show that the contribution of P. M. M. A. component to dynamic properties of the graft sample consists of two diffrent mechanisms, 1) a filler effect to cellulose component and 2) a role as a mechanical element parallel to cellulose component.
The 2nd effect is very small at low graft ratio and these effects both increase with the increase in graft ratio.
Dynamic properties of the graft samples are affected by relative humidity and the changes become smaller with the increase of graft ratio.