UNE EN ISO 3146:2022
Plastics - Determination of melting behaviour (melting temperature or melting range) of semi-crystalline polymers by capillary tube and polarizing-microscope methods (ISO 3146:2022)
Plásticos. Determinación del comportamiento de fusión (temperatura de fusión o intervalo de fusión) de polímeros semicristalinos mediante los métodos del tubo capilar y del microscopio de polarización. (ISO 3146:2022).
| Standard number: | UNE EN ISO 3146:2022 |
| Pages: | 18 |
| Released: | 2022-11-30 |
| Status: | Standard |
UNE EN ISO 3146:2022
This document specifies two methods for evaluating the melting behaviour of semi-crystalline polymers. Melting temperatures determined by the different methods usually differ by several kelvins for the reasons explained in the introduction. Method A: Capillary tube This method is based on the changes in shape of the polymer. It is applicable to all semi-crystalline polymers and their compounds. NOTE 1 Method A can also be useful for the evaluation of the softening of non-crystalline solids. Method B: Polarizing microscope This method is based on changes in the optical properties of the polymer. It is applicable to polymers containing a birefringent crystalline phase. It may not be suitable for plastics compounds containing pigments and/or other additives which could interfere with the birefringence of the polymeric crystalline zone. NOTE 2 Another method applicable to semi-crystalline polymers is described in ISO 11357-3, Plastics Differential scanning calorimetry (DSC) Part 3: Determination of temperature and enthalpy of melting and crystallization.