Synthesis and characterization of hard copolymer polyurethane/functionalized graphene nanocomposites: Investigation of morphology, thermal stability, and rheological properties
الباحث الأول:
Muayad Albozahid
الباحثين الآخرين:
Haneen Zuhair Naji, Zoalfokkar Kareem Alobad, Jacek K. Wychowaniec, Alberto Saiani
المجلة:
Journal of Applied Polymer Science
تاريخ النشر:
1 أغسطس، 2022
مختصر البحث:
Improving the performance of polyurethane is a crucial endeavor due to its
versatile properties that make it suitable for various uses, especially as a matrix
in the field of composite materials. The current work investigates the influence
of the…
Improving the performance of polyurethane is a crucial endeavor due to its
versatile properties that make it suitable for various uses, especially as a matrix
in the field of composite materials. The current work investigates the influence
of the addition of two types of graphene derivatives, graphene oxide (GO) and
reduced graphene oxide (rGO), to hard copolymer polyurethane (HCPU).
HCPUs as nanocomposites were synthesized using melt-mixing approaches
with different weight ratios of nanofiller additives. The transmission electron
microscopy and scanning electron microscopy displayed the morphology
through the incorporation of nanofillers within the HCPU structure. Thermogravimetric
analysis (TGA) testing showed an increase in the thermal stability
of HCPU with the addition of GO and rGO. Herein, the overall HCPU crystallinity/
microphase separation decreased after the addition of GO and rGO compared
to unfilled HCPU samples. The thermal stability test showed significant
enhancement with increasing GO and rGO incorporated weight ratio due to
the barrier and tortuous path effects of nanofillers. A clear increase in thermal
and electrical conductivity is found, in particular at greater content of addition
(5 wt%) of rGO in comparison with neat HCPU. The rheological behavior
showed that the storage modulus of HCPU nanocomposites increased from
that of pure HCPU, proving the formation of a filler-polymer network interaction
within the HCPU chain structure. Dispersion and physical and/or chemical
interaction of the GO and rGO within polyurethane chains plays a major
role in enhancing the morphology and thermal and rheological properties, and
thus represents a significant improvement for the final properties of HCPU
nanocomposites.
