Microstructure Evolution and Dynamic Stages of Cold-Crystallized Poly(trimethylene terephthalate) Revealed by Synchronous Fluorescence Scanning

摘要

The nonisothermal cold crystallization of PTT films is studied by means of SFS. Detailed information on the glass transition and different stages of crystallization is presented. Crystallization kinetics and activation energy obtained from SFS are in good agreement with values determined from DSC. The results show that SFS is a simple, sensitive, selective in situ method for determining structure/dynamics relationships during relaxation and crystallization of polymers. SFS overcomes the drawbacks of conventional methods and combines the advantages of resonance light scattering (high sensitivity) and fluorescence spectroscopy (a structural technique). It can provide detailed information about structural evolution at molecular level, in particular about cohesive entanglement of polymer chains.