Thermal Transitions of the Drawn Film of a Nylon 6/Layered Silicate Nanocomposite

摘要

The thermal transitions of a nylon 6/layered silicate nanocomposite were studied by differential scanning calorimetry and in-situ synchrotron X-ray diffraction.The drawn film of the nylon 6/layered silicate nanocomposite typically showed three endotherms in the DSC thermogram;a very broad endotherm at approx 120 deg C (T_1),a double-melting endotherm at approx 215 deg C (T_2),and a high temperature endotherm at approx 240 deg C (T_3).The drawn film of the nylon 6/ layered silicate nanocomposite was comprised of a mixture of the a and gamma forms,with the a form being generated by drawing the pressed film having the gamma form.The melting and crystallization of the crystals were observed at the above thermal transitions during the heating experiment performed at the Pohang X-ray synchrotron radiation source (4C2).The newly generated form was meta-stable and melted at approx T_1.The double-melting at approx T_2 was due to the exothermic crystallization of the a form during the main endothermic melting of the gammaform.The a form crystallized at approx T_2 and melted at approx T_3.