Synthesis and characterization of isophorondiamine based epoxy hardeners from aminolysis of PET

The solvolysis of poly(ethylene-terephthalate) (PET) is one of the most researched areas in chemical recycling. In this study PET aminolysis with isophorondiamine has been done - in opposition to recent trends - without excess reagent and the raw reaction product was further used without purificatio...

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Bibliographic Details
Published in:Express polymer letters 2019-07, Vol.13 (7), p.618-631
Main Authors: Karpati, L., Fejer, M., Kalocsai, D., Molnar, J., Vargha, V.
Format: Article
Language:English
Subjects:
Catalysis
Chemical industry
Chemistry
Crosslinking
Curing
Diamines
Engineering
Epoxy resins
Ethylene
Glass transition temperature
Hardeners
Hydrochloric acid
Hydrogen bonds
Mechanical properties
Methods
NMR
Nuclear magnetic resonance
Organic chemistry
Polyethylene terephthalate
Polymer chemistry
Polymer synthesis, molecular engineering
Polymers
Reagents
Recycling
Solvolysis
Thermomechanical properties
Thermosetting resins
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Summary:The solvolysis of poly(ethylene-terephthalate) (PET) is one of the most researched areas in chemical recycling. In this study PET aminolysis with isophorondiamine has been done - in opposition to recent trends - without excess reagent and the raw reaction product was further used without purification. The aminolysis product was thoroughly characterized with nuclear magnetic resonance (NMR) spectroscopy. Isophoronediamine was used as a solvent to prepare amine crosslinker solutions for epoxy resins. The effect of the concentration on the cross-linking reaction and thermomechanical properties were investigated. The curing reaction was found to be significantly accelerated by the presence of the aminolysis product. Both the ethylene-glycol and the terephthal-amide-diamines have a catalytic effect on the reaction. The glass transition temperature decreased with increasing concentrations of the cross-linker solutions due to the decreasing cross-link density. Thus, raw aminolysis products can be utilized for epoxy curing and are advantageous in modifying slower curing cycloaliphatic cross linker systems.
ISSN:1788-618X
1788-618X
DOI:10.3144/expresspolymlett.2019.52