The presence of highly oriented anisometric particles combined with the orientation of either the amorphous or crystalline phase imposes considerable undesirable anisotropy in in-plane shrinkages, which, in many cases, can lead to warpage and part deflection.
The spatial state of orientation of such highly anisometric particles as nanoclays is expected to affect the extent of shrinkage anisotropy of an injection-molded part in the planar direction.
Most anisometric particles were detected in the blend compatibilized with SB1.
The investigated materials consisted of PP matrix in which PS component was dispersed in the form of spherical or anisometric particles.
Considering the previous findings , , the stress overshoot could be attributed to network structure break down and the transient hydrodynamic stress induced by rotational motion and alignment of anisometric particles
The shear stress overshoot and the scaling of stress with strain have also been reported for suspensions with anisometric particles
and polymer liquid crystals (29), (30).