scholarly journals Graphene Oxide Functionalized Cottonseed-Lignin Resin with Enhanced Wet Adhesion for Woody Composites Application

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 1
Author(s):  
Zhiqiang Zhu ◽  
Erbing Zhang ◽  
Qinzhi Zeng ◽  
Jiuping Rao ◽  
Nairong Chen
Keyword(s):  
Shear Strength ◽  
Graphene Oxide ◽  
High Performance ◽  
Sol Gel ◽  
Cross Linking ◽  
Cottonseed Flour ◽  
Covalent Bonds ◽  
Sustainable Materials ◽  
The Fourier Transform ◽  
Chinese Standard

With rising interior air pollution, health, and food shortage concerns, wood adhesives derived from non-food sustainable materials have therefore attracted considerable attention. Here we developed an eco-friendly cottonseed-lignin adhesive consisting of non-food defatted cottonseed flour (DCF), alkali lignin (AL), and graphene oxide (GO). The cation-π interaction, and hydrogen and covalent bonds between AL@GO and DCF collectively enhanced the cross-linking structure of the cured cottonseed-lignin adhesive, based on the Fourier-transform infrared spectroscopy, thermogravimetric analyses, scanning electron microscopy, and sol-gel tests. The high performance of the developed cottonseed-lignin adhesive was evidenced by its increased wet/dry shear strength and decreased rheological properties before curing and improved thermal stability and decreased soluble substances after curing. Particularly, the highest wet shear strength of poplar plywood bonded with cottonseed-lignin adhesive was 1.08 MPa, which increased by 74.2 and 54.3% as compared to the control and requirement of the Chinese standard GB/T 9846-2015 for interior plywood (≥0.7 MPa), respectively. The technology and resultant adhesives showed great potential in the preparation of green woody composites for many applications.

scholarly journals Hyperbranched polyamide modified graphene oxide-reinforced polyurethane nanocomposites with enhanced mechanical properties

RSC Advances ◽  
2021 ◽  
Vol 11 (24) ◽  
pp. 14484-14494
Author(s):  
Yahao Liu ◽  
Jian Zheng ◽  
Xiao Zhang ◽  
Yongqiang Du ◽  
Guibo Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
High Performance ◽  
Cross Linking ◽  
Elongation At Break ◽  
Modified Graphene Oxide ◽  
High Performance Composite ◽  
Modified Graphene ◽  
Polyurethane Nanocomposites ◽  
Hyperbranched Polyamide

We successfully modified graphene oxide with amino-terminated hyperbranched polyamide (HGO), and obtained a high-performance composite with enhanced strength and elongation at break via cross-linking hydroxyl-terminated polybutadiene chains with HGO.

Achieving high-performance epoxy nanocomposites with trifunctional poly(oxypropylene)amines functionalized graphene oxide

2019 ◽  
Vol 31 (5) ◽  
pp. 557-569 ◽  
Author(s):  
Tong Sun ◽  
Huawei Zou ◽  
Ya Zhou ◽  
Rui Li ◽  
Mei Liang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
High Performance ◽  
Flexural Modulus ◽  
Covalent Bonds ◽  
Spectra Analysis ◽  
Functionalized Graphene Oxide ◽  
Ep Matrix ◽  
Functional Graphene Oxide ◽  
The Relationship

In this article, two types of functional graphene oxide (GO) with amine-rich surface were synthesized through chemically grafting two different molecular chain length trifunctional poly(oxypropylene)amines T5000 and T403, which were named as T5000-GO and T403-GO, respectively. The functionalized GO was then added to epoxy (EP) resin. Fourier transform infrared spectra analysis confirmed successful chemical functionalization on GO. Both T403-GO and T5000-GO were tightly embedded in the EP, because the amine-rich surface of functionalized-GO could form covalent bonds with the EP matrix, thereby contributing to the enhancement of mechanical properties. Particularly, T5000-GO, which has longer grafting molecule chains, achieved better compatibility and dispersibility in the EP matrix, resulting in a better reinforcing efficiency in mechanical properties. For example, the T5000-GO/EP composites showed an incremental enhancement in tensile strength with increasing filler concentrations, whereas their T403-GO/EP counterparts failed to follow the same trend. Meanwhile, the T5000-GO/EP composites with only 0.1-wt% T5000-GO achieved a prominent increase in flexural strength (approximately 50%) and flexural modulus (approximately 26.8%), which were higher than those of T403-GO-filled counterparts. This work indicated that the compatibility and interphase between GO and EP could be designed by manipulating the length of grafting molecule chains, thereby providing a better understanding of the relationship between the structure and mechanical properties of the graphene/EP nanocomposites.

Simultaneous Sheet Cross-Linking and Deoxygenation in the Graphene Oxide Sol–Gel Transition

2014 ◽  
Vol 118 (49) ◽  
pp. 28855-28860 ◽  
Author(s):  
Anna P. Goldstein ◽  
William Mickelson ◽  
Ariella Machness ◽  
Gloria Lee ◽  
Marcus A. Worsley ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Sol Gel ◽  
Cross Linking ◽  
Sol Gel Transition ◽  
Gel Transition

Fused Heterocyclic Molecule-Functionalized N-Doped Reduced Graphene Oxide by Non-Covalent Bonds for High-Performance Supercapacitors

2020 ◽  
Vol 12 (40) ◽  
pp. 45202-45213
Author(s):  
Liming Xu ◽  
Yingying Zhang ◽  
Weiqiang Zhou ◽  
Fengxing Jiang ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Covalent Bonds ◽  
Heterocyclic Molecule ◽  
Reduced Graphene

Synthesis and Electrochemical Properties of Functionalized Graphene Oxide/ZnO Composites

2016 ◽  
Vol 680 ◽  
pp. 233-237 ◽  
Author(s):  
Fang Fang Ding ◽  
Na Zhang ◽  
Cheng Zhang
Keyword(s):  
Graphene Oxide ◽  
High Performance ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Functionalized Graphene Oxide ◽  
Self Assembling ◽  
Structure Morphology ◽  
Sol Gel Process ◽  
Wet Chemical

ZnO quantum dots (QDs) are anchored on graphene oxide (GO) by a wet chemical self-assembling technique. Firstly, GO are functionalized with thiol (f-GO) by a series of chemical reactions and the ZnO alcogel are prepared by a sol–gel process. Secondly, the f-GO/ZnO composite is obtained by a self-assembling technique. Typically, X-ray diffraction (XRD), scanning electron microscopy (SEM) and EDS spectrum are employed to characterize the structure, morphology and composition of the obtained samples, moreover, the electrochemical performance of the as-prepared electrode is also detected by cyclic voltammetry and galvanostatic charge–discharge experiments. It is found that the f-GO/ZnO-1 possesses the highest specific values of 149.4F/g and good long-term cycle stability. The results show that the f-GO/ZnO nanocomposite could be used as electrode material for high performance supercapacitors.

Effect of MCl (M = Na, K) addition on microstructure and electrical conductivity of forsterite

2020 ◽  
Vol 92 (1) ◽  
pp. 10901
Author(s):  
Saloua El Asri ◽  
Hamid Ahamdane ◽  
Lahoucine Hajji ◽  
Mohamed El Hadri ◽  
Moulay Ahmed El Idrissi Raghni ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electrical Conductivity ◽  
Single Phase ◽  
Sol Gel ◽  
Complex Impedance ◽  
Transmission Spectra ◽  
Electrical Measurements ◽  
Cation Type ◽  
Edx Analyses ◽  
The Fourier Transform

Forsterite single phase powder Mg2SiO4 was synthesized by sol–gel method alongside with heat treatment, using two different cation alkaline salts MCl as mineralizers (M = Na, K) with various mass percentages (2.5, 5, 7.5, and 10 wt.%). In this work, we report on the effect of the cation type and the added amount of used mineralizer on microstructure and electrical conductivity of Mg2SiO4. The formation of forsterite started at 680–740  °C and at 630–700  °C with KCl and NaCl respectively, as shown by TG-DTA and confirmed by XRD. Furthermore, the Fourier transform infrared (FTIR) transmission spectra indicated bands corresponding to vibrations of forsterite structure. The morphology and elemental composition of sintered ceramics were examined by SEM-EDX analyses, while their densities, which were measured by Archimedes method, increased with addition of both alkaline salts. The electrical measurements were performed by Complex Impedance Spectroscopy. The results showed that electrical conductivity increased with the addition of both mineralizers, which was higher for samples prepared with NaCl than those prepared with KCl.

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