Preparation and Properties of Poly(ethylene terephthalate)/Silica Nanocomposites

摘要

Using in-situ polymerization and the compatibility between silica nanoparticles and ethylene glycol (EG), we successfully fabricated Polyethylene terephthalate)/sihea nanocomposites. Transmission electron microscopy (TEM) micrographs revealed that the silica nanoparticles are well dispersed in the PET matrix without any aggregation, and the particles size is about 10nm with narrow distribution. Differential scanning calorimetry (DSC) results indicate that the glass transition temperatures of the nanocornposits increase with increasing silica content, and the melting temperature of the nanocompsoites was higher than that of pure PET. The silica nanoparticles can act as an effective nucleatton agent during PET crystallization. Two set of as-spun fibers (pure PET and PET/silica nanocomposites) were spun at take speed in the range of 400-1000m/min and drawing in the range of 3.6-4.4 ratios. The mechanical properties show that the tenacity of PET nanocomposites fibers was higher than that of pure PET fibers, the modulus of PET nanocomposites fibers was also higher than that of pure PET. We think the enhancement of tenacity and modulus caused by the strong interaction between the nanoparticles and polymer chains.