PVC-DOP 系の降伏における時間ー濃度換算法則の検討

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The time and concentration dependences of yield stress were examined for poly (vinyl chloride) (PVC) plastisized with small amount of di-2-ethylhexyl phthalate (DOP), over concentration range of 0.270 to 0.125 in volume fraction of DOP, which is a part of studying the transformation from fluid fracture to ductile fracture, and from ductile fracture to brittle fracture, with sample liquid-like rubber-like and hard plastic polymers. Tensile yield stress σ_y was measured at room temperature and at strain rates ε^^. varying from 0.020 min^<-1> to 20.0 min.^<-1>. The resultant yield stress was plotted in the form log (σ_yρ_s/ρ) against ε^^., where ρ is weight of PVC per unit volume of the sheet, and ρ_s is a ρ selected arbitrarily as reference. These data for the samples with various concentrations have been shifted laterally along the strain rate axis to construct a yield stress muster curve. The dependence of shift distance log a_c on volume fraction of plastisizer v_1, or that of polymer v_2(=1-v_1), seems to be represented approximately by the relation log a_c=b(v_2-v_<2s>) at high v_2 range, where b is constant. This expression is obtained from Andrade's viscosity equation η=A exp (U/RT) and the relation a_c=η/η_s, where U is replaced by cohesive energy of chain segment-solvent molecule; U=a+bv_2. The yield strain data and briefringence data observed in ruptured specimens were also shifted laterally along the strain rate axis by the same distance that was used for superposition of yield stress data. The shifted yield strain data did not form a curve but gave a domain. The birefringence data form a muster curve at v_2=0.73. This curve seems to increase rapidly at a shifted strain rate 1.00min^<-1>. In the test of the strain rate mentioned above, clear necking was observed in the specimens.
社団法人日本材料学会の論文
1968-04-15

PVC-DOP 系の降伏における時間ー濃度換算法則の検討

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