Investigation of Morphology of Recycled PET by Modulated DSC

Abstract

Abstract. During research injection molded samples were made from recycled poly(ethylene terephthalate) (PET). Morphological properties of samples were investigated by modulated differential scanning calorimetry (MDSC). Total heat flow was separated in two parts, reversing and non-reversing heat flow during measurements. Relationships were found between crystallization and melting processes: the initial crystallinity equals to the non-reversing melting, and the postcrystallization processes equals to reversing melting.

Effect of crystallinity on the recovery rate of superhydrophobicity in plasma-nanostructured polymers

“…Compared to general differential scanning calorimetry (DSC), which makes it difficult to detect small changes in crystallinity and the data interpretation are unclear because the heat ow rate is shown as one signal (total heat ow), MDSC has a higher sensitivity, or resolution, to small changes in crystal structure since it can separate kinetic events which occur with temperature changes; this measures the initial crystallinity with a higher accuracy. 11,12 For this experiment, the heating rate was set to 4 C min À1 , heating rate amplitude to AE0.424 C, and period to 40 s. For the specimens that underwent recrystallization, the crystallization enthalpy was determined by subtracting the recrystallization enthalpy value (DH non-rev , exothermic) detected in the non-reversing heat ow from the total crystallization enthalpy value (DH rev , endothermic) of the reversing heat ow. However, for the specimens that did not undergo recrystallization, the crystallization enthalpy value from the total heat ow (DH) was used.…”

Recycling of Mineral Water Bottles with Chemical Foaming

“…In the case of chemical foaming moulding, structural foam is produced because the shell of the product which is in contact with the wall of the tempered tool is generally solid [9]. Towards the core the foamed proportion increases.…”