In situ polymerization of mechanically reinforced, thermally healable graphene oxide/polyurethane composites based on Diels–Alder chemistry

2014 ◽  
Vol 2 (48) ◽  
pp. 20642-20649 ◽  
Author(s):  
Jinhui Li ◽  
Guoping Zhang ◽  
Libo Deng ◽  
Songfang Zhao ◽  
Yongju Gao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
In Situ Polymerization ◽  
Diels Alder ◽  
Mechanical Reinforcement ◽  
Covalently Bonded ◽  
Polyurethane Composites

Covalently bonded graphene oxide/polyurethane composites with significant mechanical reinforcement and thermally healable capability were developed via in situ polymerization based on Diels–Alder chemistry.

scholarly journals Influence of Graphene Oxide Contents on Mechanical Behavior of Polyurethane Composites Fabricated with Different Diisocyanates

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 444
Author(s):  
Nadia Akram ◽  
Muhammad Saeed ◽  
Muhammad Usman ◽  
Asim Mansha ◽  
Fozia Anjum ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Mechanical Behavior ◽  
In Situ Polymerization ◽  
Complex Modulus ◽  
Phase Segregation ◽  
Hexamethylene Diisocyanate ◽  
Polymerization Process ◽  
Gravimetric Analysis ◽  
Polyurethane Composites

The exceptional behavior of graphene has not yet been entirely implicit in the polymer matrix. To explore this fact in the present work, two series of Polyurethan (PU) composites were synthesized. The structural modification was observed by the use of two different diisocyanate of methylene diisocyanate (MDI) and hexamethylene diisocyanate (HMDI) in hydroxylterminated polybutadiene (HTPB) by using I,4 Butane diol (BD) as the chain extender. The variation in hard segment up to 25 (wt.%) in both series led to significant changes in the mechanical behavior of graphene oxide (GO) induced composites. Both series were prepared by an in situ polymerization process. Fourier transform infrared (FTIR) analysis showed a peak in the region of 1700 cm−1, which confirmed the conversion of the NCO group into urethane linkages. Thermal gravimetric analysis (TGA) revealed a thermal stability up to 450 °C @ 90% weight loss. The swelling behavior showed the optimum uptake of 30% of water and 40% of dimethyl sulfoxide (DMSO) with aliphatic diisocyanate. The values of storage modulus (E′), complex modulus (E*), and compliance complex (D*) were observed up to 7 MPa, 8 Mpa, and 0.7 MPa−1, respectively. The degree of entanglement (N) values were calculated from DMA and were found in the range of 1.7 × 10−4 (mol/m3). Phase segregation of PU was observed by scanning electron microscopy (SEM), elucidating the morphology of composites.

Influence of Acid-Treated Carbon Nano-Tubes on the Microstructure and Properties of Carbon Nano-Tubes Polyurethane Composites

2010 ◽  
Vol 146-147 ◽  
pp. 805-809
Author(s):  
Ji You Gu ◽  
Lan Zhang ◽  
Xian Kai Jiang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Acid Treatment ◽  
In Situ Polymerization ◽  
Mechanical Analysis ◽  
X Ray ◽  
Carbon Nano Tubes ◽  
Dynamic Storage ◽  
Treated Carbon ◽  
Polyurethane Composites

The investigations including the acid treatment to multi-walled carbon nano-tubes (MWNTs) and the synthesis of MWNTs/polyurethane composites via in situ polymerization were done. X-ray Photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and dynamic mechanical analysis (DMA) were utilized for evaluating the effects of acid-treated MWNTs on the properties and microstructure of the composites. The results indicated that carboxyl groups could be successfully introduced onto the surface of MWNTs by acid treatment. The dynamic storage modulus and glass transition temperature of composites increased with the existence of MWNTs. The improvement of polyurethane by acid-treated MWNTs performed better compared to raw MWNTs.

High-density polyethylene/graphene oxide nanocomposites prepared via in situ polymerization: Morphology, thermal, and electrical properties

2018 ◽  
Vol 16 ◽  
pp. 232-241 ◽  
Author(s):  
Antonio Cruz-Aguilar ◽  
Dámaso Navarro-Rodríguez ◽  
Odilia Pérez-Camacho ◽  
Salvador Fernández-Tavizón ◽  
Carlos Alberto Gallardo-Vega ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrical Properties ◽  
High Density Polyethylene ◽  
In Situ Polymerization ◽  
High Density ◽  
Thermal And Electrical Properties

Improved mechanical and antibacterial properties of silver-graphene oxide hybrid/polylactid acid composites by in-situ polymerization

2019 ◽  
Vol 130 ◽  
pp. 571-579 ◽  
Author(s):  
Xiao-Jun Shen ◽  
Shu Yang ◽  
Jian-Xiang Shen ◽  
Jun-Li Ma ◽  
Yin-Qiu Wu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
In Situ Polymerization ◽  
Antibacterial Properties
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