An in-situ sol-gel approach to create functional PET/ nano-TiO2 hybrid resin during PET synthesis

摘要

In-situ sol-gel process is one of the most important methods for preparation of organic-inorganic hybrids with high performance properties. In present work, the results shown that introducing the tetrabutylorthotitanate (TBOT) has no effects on the esterification degree, the molecular weight and its distribution, thermal properties and fiber process ability of resulted PET base hybrid resin. The sphere-like nano-TiO2 has been in-situ formed and is almost mono-and well-dispersed into PET matrix. It is attributed to partially organic modification as shown by FTIR while it is in-situ formed. The resulted PET composites with lower than 0.5wt% nano-TiO2 content can be winded with 800 rpm winding speed at stable spinpack pressure under 305°C chest temperature and 35.6g·ml-1 pump delivery. The as-spun fibers have good drawing ability and the tensile strength at break of the resulted fibers can amount to about 3.8 cN/dtex. These indicate that the resulted PET resins with lower than 0.5wt% nano-TiO2 content have good spinnability. UV shielding ability of the fabric is excellent. Its UPF (UV protection factor) of fabric is higher than 50 as its nano-TiO2 containing is higher than 0.3 wt%. Therefore, it is a promising way to develop functional polyester base hybrid materials including fiber, plastic and coating by our so-called both in-situ fabrication method.