Critical Cooling Rate of Fast-Crystallizing Polyesters: The Example of Poly(alkylene trans -1,4-cyclohexanedicarboxylate)

Controlling the cooling rate experienced by a material during a manufacturing process is a challenge and a major issue. Industrial processing techniques are very diverse and may involve a whole range of cooling rates, which are sometimes extremely high for small and/or thin manufactured parts. For p...

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Bibliographic Details
Published in:Polymers 2024-10, Vol.16 (19), p.2792
Main Authors: Hallavant, Kylian, Soccio, Michelina, Guidotti, Giulia, Lotti, Nadia, Esposito, Antonella, Saiter-Fourcin, Allisson
Format: Article
Language:English
Subjects:
Analysis
Calorimetry
Carboxylic acids
Cooling
Cooling rate
Cyclohexane
Differential scanning calorimetry
Engineering Sciences
Heat treating
Identification and classification
Materials
Mechanical properties
Methods
Molecular weight
Polyester resins
Polyesters
Polymers
Properties
Reagents
Temperature
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Summary:Controlling the cooling rate experienced by a material during a manufacturing process is a challenge and a major issue. Industrial processing techniques are very diverse and may involve a whole range of cooling rates, which are sometimes extremely high for small and/or thin manufactured parts. For polymers, the cooling rate has consequences on both the microstructure and the time-dependent properties. The common cooling rates associated with conventional calorimetric measurements are generally limited to a few tens of degrees per minute. This work combines several calorimetric techniques (DSC, modulated-temperature DSC, stochastically-modulated DSC and Fast Scanning Calorimetry) to estimate the critical cooling rate required to melt-quench fast-crystallizing polyesters to their fully amorphous state, based on the example of a series of poly(alkylene -1,4-cyclohexanedicarboxylate) (PCHs) with a number of methylene groups in the main structure of the repeating unit nCH2 varying from 3 to 6. The even-numbered ones require faster cooling rates (about 3000 K s for nCH2 = 4, between 500 and 1000 K s for nCH2 = 6) compared to the odd-numbered ones (between 50 K min and 100 K s for nCH2 = 3, between 10 and 30 K min for nCH2 = 5).
ISSN:2073-4360
2073-4360
DOI:10.3390/polym16192792