The Effect of Shear Flow on the Crystallization Behavior of Poly (lactic acid) with Dibenzoylhydrazide Nucleating Agent

We investigated the effect of dibenzoylhydrazide nucleating agent (OMBH) which forms network structure on the crystallization behavior of PLA under the shear flow. Network structure of OMBH enhanced G' of PLA/OMBH which is one of nucleating agent for PLA. When applying the shear flow to PLA/OMBH at crystallization temperature, half crystallization time decreased, and crystallization rate rose. PLA/OMBH forms transcrystal when the shear rate was less than 1/τd . The structure of OMBH was destroyed under shear rate of more than 1/τd , leading to the formation of three dimensional spherulite nucleated from the collapsed short strand of OMBH.