| 초록 |
The thermal stabilities, mechanical properties, and morphologies of nanocomposites of three different polyesters with dodecyltriphenylphosphonium -montmorillonite (C12PPh-MMT) are compared. Poly(butylene terephthalate) (PBT), poly(ethylene terephthalate) (PET), and poly(trimethylene terephthalate) (PTT) were used as matrix polymers in the fabrication of polyester nanocomposite fibers. The variations of their properties with organoclay content in the polymer matrix and draw ratio (DR) are discussed. Transmission electron microscopy (TEM) micrographs show that some of the clay layers are dispersed homogeneously within the polymer matrix on the nano-scale, although some clay particles are agglomerated. We also found that the addition of only a small amount of organoclay is enough to improve the thermal stabilities and mechanical properties of the polyester nanocomposite fibers. Even polymers with low organoclay contents (＜5 wt %) were found to exhibit much higher strength and modulus values than pure polyester. In the cases of all polyesters/C12PPh-MMT, the values of the tensile mechanical properties of the hybrid fibers were found to decrease linearly with increases in DR from 1 to 16. However, the initial tensile modulus of the PTT hybrid fibers were found to be independent of DR. |
