Composition-property relationship of polyurethane networks based on polycaprolactone diol

This work was focused on the synthesis of polyurethane networks (PUNs) based on polycaprolactone (PCL) as soft segment (SS) and Boltorn® aliphatic hyperbranched polyester of the second pseudo generation and 4,4′-diphenylmethane diisocyanate (MDI) as the parts of the hard segments (HS), by a two-step...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 2021-12, Vol.78 (12), p.7103-7128
Main Authors: Stefanović, Ivan S., Džunuzović, Jasna V., Džunuzović, Enis S., Dapčević, Aleksandra, Šešlija, Sanja I., Balanč, Bojana D., Dobrzyńska-Mizera, Monika
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Crosslinking
Diphenyl methane diisocyanate
Glass transition temperature
Hydrophobicity
Impact strength
Investigations
Mechanical properties
Molecular weight
Morphology
Organic Chemistry
Original Paper
Physical Chemistry
Physical properties
Polycaprolactone
Polyesters
Polymer Sciences
Polymerization
Polyurethane resins
Rubbery plateau modulus
Segments
Soft and Granular Matter
Solution polymerization
Solvents
Storage modulus
Temperature
Tensile strength
Thermal stability
Thermodynamic properties
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Summary:This work was focused on the synthesis of polyurethane networks (PUNs) based on polycaprolactone (PCL) as soft segment (SS) and Boltorn® aliphatic hyperbranched polyester of the second pseudo generation and 4,4′-diphenylmethane diisocyanate (MDI) as the parts of the hard segments (HS), by a two-step solution polymerization. In order to find the best ratio between HS and SS to achieve good thermal and mechanical properties, suitable hydrophobicity and morphology of the PUNs, various experimental analyses were conducted. The obtained results revealed that features of the PUNs highly depend on the PCL content. The increase in the PCL content leads to the increase in thermal stability, hydrophobicity and appearance of the microphase separation, but on the other side, it also leads to the decrease in storage modulus in the rubbery plateau, crosslinking density and glass transition temperatures of PUNs. This work shows that features of PUNs can be easily adjusted for a specific application by careful selection of the SS and HS ratio.
ISSN:0170-0839
1436-2449
DOI:10.1007/s00289-020-03473-0