Measuring Thermal Crystallinity in PET
The mechanical properties of poly (ethylene terephthalate) (PET) depend on the degree of crystallinity. PET crystallizes from both thermal and strain-induced process paths. Strain-induced crystallization occurs under uniaxial or biaxial stretching, the latter is common in stretch blow molding. Thermal crystallization takes place when cooling from the melt or under sustained elevated temperature which are both common during injection and blow molding. The current work focuses on comparing methods used to quantify the percent thermal crystallinity in injection molded water bottle preforms. An injection molded preform with a gradient of induced thermal crystallinity was examined using Differential Scanning Calorimetry (DSC), Micro X-ray Diffraction (μXRD), and Raman Spectroscopy. Correlating these three techniques for percent thermal crystallinity, helps with the development of nondestructive crystallinity measurement methods to aid with process optimization and part quality.
Eco-friendly, Expeditious Depolymerization of PET in the Blend Fabrics by Using a Bio-based Deep Eutectic Solvent under Microwave Irradiation for Composition Identification
An eco-friendly, expeditious technique was developed for depolymerization of polyethylene terephthalate (PET) in blend fabric. A completely bio-based deep eutectic solvent (DES), glycerol-choline chloride (GC), could replace conventional toxic solvents commonly used in PET depolymerization. Microwave irradiation was used to facilitate the process with high energy efficiency. The PET portion in 65/35 and 50/50 PET/cotton blends was removed by GC containing 5% NaOH in less than 100 seconds of microwave irradiation. Various instrumental techniques such as FTIR, TGA, SEM, and XRD substantiated the removal of PET from the blend fabrics. The depolymerization mechanism was investigated by analyzing its dissolved residues by HPLC. Finally, a commercial sample with 45/55 PET/cotton was also examined to confirm that the test method developed could have practical application.
Mechanism of Action of Antibacterial Agents
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