Poly (ethylene terephtalate): a comparison between inverse gas chromatography and rate of solubilization in phenol.

The morphology of semicrystalline polymeric materials(PETP) was studied by an etching technique and by isothermal inverse gas-chromatography. Using these two techniques the same results for semicrystalline isotropic materials were obtained and these results wer found to depend only on the crystalline fraction. Isothermal inverse gas-chromatography permits an evaluation of the macromolecular orientation while the etching technique shows the same behaviour both for isotropic and anisotropic materials.