Investigation of the effect of graphene oxide functionalization on the physical, mechanical and shape memory properties of polyurethane/reduced graphene oxide nanocomposites

2019 ◽  
Vol 95 ◽  
pp. 195-205 ◽  
Author(s):  
Reza Lotfi Mayan Sofla ◽  
Mostafa Rezaei ◽  
Amin Babaie
Keyword(s):  
Graphene Oxide ◽  
Shape Memory ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene ◽  
Shape Memory Properties

Biobased waterborne hyperbranched polyurethane/NiFe2O4@rGO nanocomposite with multi-stimuli responsive shape memory attributes

RSC Advances ◽  
2016 ◽  
Vol 6 (97) ◽  
pp. 94815-94825 ◽  
Author(s):  
Satyabrat Gogoi ◽  
Niranjan Karak
Keyword(s):  
Graphene Oxide ◽  
Shape Memory ◽  
Reduced Graphene Oxide ◽  
Nickel Ferrite ◽  
Shape Memory Material ◽  
Stimuli Responsive ◽  
Memory Material ◽  
Hyperbranched Polyurethane ◽  
Reduced Graphene

A biobased waterborne hyperbranched polyurethane nanocomposite was in situ fabricated with nickel ferrite/reduced graphene oxide nanohybrid (NiFe2O4@rGO) as stimuli responsive shape memory material.

Functionalization and Chemical Linking of Reduced Graphene Oxide or Graphite onto Polyurethane and the Impact on the Tensile Strength and Sheet Resistance of Polymer Composites

2018 ◽  
Vol 26 (2) ◽  
pp. 141-153
Author(s):  
Yong-Chan Chung ◽  
Ho-Sung Kim ◽  
Byoung Chul Chun
Keyword(s):  
Tensile Strength ◽  
Graphene Oxide ◽  
Shape Memory ◽  
Reduced Graphene Oxide ◽  
Sheet Resistance ◽  
Sharp Decrease ◽  
Hydroxyl Groups ◽  
Functionalized Graphene Oxide ◽  
Reduced Graphene ◽  
The Impact

Reduced graphene oxide (RGO) or graphite is functionalized with hydroxyl groups for linking to the sides of polyurethane (PU) chains. Blended PU with RGO or graphite is prepared as a control for comparison. The PU composites are compared with respect to their spectroscopic, thermal, mechanical, shape memory, and sheet resistance properties. Scanning electron microscopy images demonstrate the good distribution of functionalized graphene oxide (FGO) or functionalized graphite (FG) particles on the inner surface of the PU. The linking of FGO or FG onto PU does not significantly affect the thermal behavior or shape memory properties but sharply improves the tensile strength of the PU composites without a noticeable decrease in tensile strain. The shape recovery of PU composites remains at approximately 90%, regardless of the FGO or FG content. The FG-linked PU composites exhibit a sharp decrease in sheet resistance as the FG content increases, whereas the sheet resistance of the FGO-linked PU composites does not decrease with increasing FGO content. The control PU composites with blended RGO or graphite show significant reductions in their sheet resistance. Considering the ease of functionalization of the graphite surface and the significant improvement in tensile strength, linking FG onto PU is advantageous for the development of PU composites with low sheet resistance.

Dual-Responsive Shape Memory and Thermally Reconfigurable Reduced Graphene Oxide-Vitrimer Composites

2019 ◽  
Vol 27 (6) ◽  
pp. 526-533 ◽  
Author(s):  
Guo-kang Chen ◽  
Kun Wu ◽  
Qian Zhang ◽  
Yan-cen Shi ◽  
Man-geng Lu
Keyword(s):  
Graphene Oxide ◽  
Shape Memory ◽  
Reduced Graphene Oxide ◽  
Dual Responsive ◽  
Reduced Graphene
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