Study On Preparation Of Polymeric / Ellensite Nanocomposite Nanofiber By Electrospinning And Its Mechanical Properties

Halloysite nanotubes’(HNTs) are novel 1D natural nanomaterials with predominantly hollow tubular nanostructures and high aspect ratios. Due to their high mechanical strength, thermal stability and biocompatibility, HNTs have many potential applications in polymer nanocomposites.In this paper, we prepared three types of polymer/HNTs composite nanofibers by electrospun. Do the modification on the HNTs to improve the dispersion and stability. And after the nanofibers were prepared by electrospining, the morphology, thermal stability and mechanical properties of the composite fibers were investigated.Study on the structure, physical properties, dispersion and stability of HNTs by XRD, FT-IR, TGA, SEM, TEM and other characterization methods, the results show that the domestic HNTs which we used has a length of 200-500 nm. The tubular structure of HNTs remains intact after calcining in high temperature, showing that HNTs has good thermal stability. Also the HNTs has good acid and alkali resistance. After the modification of HNTs, the structure and morphology didn’t change, the HNTs after modification dispersion well in H2O and DMF, didn’t precipitation after long time.The results showed that the diameters of PVA/HNTs composite nanofibers were about 350 nm, bigger than PVA fibers. When the content of HNTs reach to 25%, the fibers start to break and thrust. The crystal structure changed by the effect of HNTs, the Tg improved 5.72℃ at most, indicated that the thermal stability increased. When the content of HNTs reach to 15%, the tensile modulus and tensile strength increased about 51.80% and 96.43%, indicated that the composite fibers have high mechanical properties.The PAN/HNTs composite nanofibers were prepared and characterized, the results showed that the diameter of PAN/HNTs composite nanofibers are 250 nm on average, the structure and appearance of PAN/HNTs composite nanofibers is almost the same as PAN fibers, but the crystal structures are different. The PAN/HNTs composite nanofibers is better in thermal stability and mechanical properties, the Tg increased 9.4℃, and the tensile modulus and tensile strength increased about 53.35% and 86.13% at most.The PMMA/HNTs composite nanofibers were characterized by SEM, DSC, XRD and FT-IR, The diameters of PMMA/HNTs composite nanofibers is about 950 nm, the crystallinity changed by the function of HNTs. The Tg increased 5.17 ℃, and the tensile modulus and tensile strength increased about 81.67% and 54.09% at most.