What is the principle of differential scanning calorimeter?
The basic principle underlying this technique is that when the sample undergoes a physical transformation such as phase transitions, more or less heat will need to flow to it than the reference to maintain both at the same temperature.
What is DSC of pet?
Traditional (20 °C/min) DSC analysis of an amorphous sample of PET will include a glass transition around 80 °C, a cold crystallization exotherm near 120 °C and a melt with onset around 245 °C. This confirms the metastable nature of the amorphous PET sample on heating, which is common for many thermoplastic materials.
What reference material is used in DSC?
Eight inorganic substances recommended by ICTA as temperature standard reference materials for DTA and DSC were studied: KNO3, KClO4, Ag2SO4, K2CrO4, quartz, K2SO4, BaCO3 and SrCO3.
What is the crystallization temperature of pet?
It can be seen that the crystallization peak temperature of PET hardly changes in the thermal treatment temperature range of 258–260 °C, which means that the PET spherulites are in a state of complete melting in the range of 258–260 °C.
What kind of reference material is used in DTA?
In DTA is usually used alumina (Al2O3), carborundum(SiC) or magnesium oxide(MgO) powder as the reference material for the analysis of inorganic compounds.
What is the crystallinity of PET?
PET is a crystallizable polymer because of its regularity in chemical and geometric structures. It is either in the semi-crystalline state or in the amorphous state. The levels of crystallinity and morphology significantly affect the properties of the polymers [11].
Why does PET have a high melting point?
The high melting point and tendency to superheat suggest that the crystals possess a substantial extended chain structure, notwithstanding the magnitude of the infrared fold band. are minified by the absence of continuity in the crystalline phase.
What are the advantages of differential scanning calorimetry?
The biggest advantage of DSC is the ease and speed with which it can be used to see transitions in materials. If you work with polymeric materials of any type, the glass transition is important to understanding your material.
What is the crystallization temperature of PET?
Is PET amorphous or semi-crystalline?
What is PET where it is used?
PET (also abbreviated PETE) is short for polyethylene terephthalate, the chemical name for polyester. PET is a clear, strong, and lightweight plastic that is widely used for packaging foods and beverages, especially convenience-sized soft drinks, juices and water.
Is PET hydrophobic or hydrophilic?
hydrophilic
The results indicate that pristine PET and TPU have different hydrophobicity properties behaviour. PET exhibits as hydrophilic meanwhile TPU as hydrophobic.