Effect of Particle Size and Surface Modification on Mechanical Properties of Poly(para-dioxanone)/ Inorganic Particles

摘要

Poly(para-dioxanone) (PPDO)-based composites have been prepared by blending PPDO with three different types of CaCO3 particles, CC1 (nano-CaCO3), CC2 (CaCO3 whisker), and CC3 (silane-coated CaCO3 whisker). The effects of particles size, interface adhesion, and crystallinity of composites on mechanical properties were discovered through analysis of the morphology of fracture surfaces, thermal characteristics, and crystalline structure. DSC revealed that the CaCO3 particles acted as a nucleating agent and promoted crystallinity of PPDO. The effect of CaCO3 particles on crystallization of PPDO was clearly revealed by using the nucleating efficiency. Smaller size particles exhibit greater nucleating efficiency. Adhesion between PPDO and the CaCO3 particles plays major roles on the mechanical properties of composites. The tensile strength of PPDO was improved over 54%.