scholarly journals High-Performance Biobased Unsaturated Polyester Nanocomposites with Very Low Loadings of Graphene

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1288 ◽  
Author(s):  
Chengguo Liu ◽  
Cuina Wang ◽  
Jijun Tang ◽  
Jing Zhang ◽  
Qianqian Shang ◽  
...  
Keyword(s):  
High Performance ◽  
Graphene Nanosheets ◽  
Unsaturated Polyester ◽  
Diels Alder ◽  
Mechanical And Thermal Properties ◽  
Comprehensive Properties ◽  
Melt Polycondensation ◽  
Dispersion State ◽  
Structural Plastics

Graphene-reinforced tung oil (TO)-based unsaturated polyester nanocomposites were prepared via in situ melt polycondensation intergrated with Diels–Alder addition. Functionalized graphene sheets derived from graphene oxide (GO) were then extracted from the obtained nanocomposites and carefully characterized. Furthermore, dispersion state of the graphene nanosheets in the cured polymer composites and ultimate properties of the resultant biobased nanocomposites were investigated. Mechanical and thermal properties of the TO-based unsaturated polyester resin (UPR) were greatly improved by the incorporation of GO. For example, at the optimal GO content (only 0.10 wt %), the obtained biobased nanocomposite showed tensile strength and modulus of 43.2 MPa and 2.62 GPa, and Tg of 105.2 °C, which were 159%, 191%, and 49.4% higher than those of the unreinforced UPR/TO resin, respectively. Compared to neat UPR, the biobased UPR nanocomposite with 0.1 wt % of GO even demonstrated superior comprehensive properties (comparable stiffness and Tg, while better toughness and thermal stability). Therefore, the developed biobased UPR nanocomposites are very promising to be applied in structural plastics.

scholarly journals Effect of Different Flame-Retardant Bridged DOPO Derivatives on Properties of in Situ Produced Fiber-Forming Polyamide 6

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 657 ◽  
Author(s):  
Jelena Vasiljević ◽  
Marija Čolović ◽  
Nataša Čelan Korošin ◽  
Matic Šobak ◽  
Žiga Štirn ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Melt Spinning ◽  
Research Work ◽  
Polyamide 6 ◽  
Fibrous Materials ◽  
Comprehensive Properties ◽  
Novel Approach ◽  
Dispersion State ◽  
Spinning Process

The production of sustainable and effective flame retardant (FR) polyamide 6 (PA6) fibrous materials requires the establishment of a novel approach for the production of polyamide 6/FR nanodispersed systems. This research work explores the influence of three different flame-retardant bridged 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) derivatives on the comprehensive properties of in situ produced PA6/FR systems. To this end, in situ water-catalyzed ring-opening polymerization of ε-caprolactam was conducted in the presence of three different bridged DOPO derivatives, e.g., one P−N bond phosphonamidate derivative and two P−C bond phosphinate derivatives. The selected bridged DOPO derivatives mainly act in the gas phase at the temperatures that relatively match the PA6 pyrolysis specifics. The effects of the FRs on the dispersion state, morphological, molecular, structural, melt-rheological, and thermal properties of the in situ synthesized PA6 were evaluated. The specific advantage of this approach is one-step production of PA6 with uniformly distributed nanodispersed FR, which was obtained in the case of all three applied FRs. However, the applied FRs differently interacted with monomer and polymer during the polymerization, which was reflected in the length of PA6 chains, crystalline structure, and melt-rheological properties. The applied FRs provided a comparable effect on the thermal stability of PA6 and stabilization of the PA6/FR systems above 450 °C in the oxygen-assisted pyrolysis. However, only with the specifically designed FR molecule were the comprehensive properties of the fiber-forming PA6 satisfied for the continuous conduction of the melt-spinning process.

Supramolecule-Inspired Fabrication of Carbon Nanoparticles In Situ Anchored Graphene Nanosheets Material for High-Performance Supercapacitors

2016 ◽  
Vol 8 (40) ◽  
pp. 26775-26782 ◽  
Author(s):  
Yulan Huang ◽  
Aimei Gao ◽  
Xiaona Song ◽  
Dong Shu ◽  
Fenyun Yi ◽  
...  
Keyword(s):  
Carbon Nanoparticles ◽  
High Performance ◽  
Graphene Nanosheets

Precise Synthesis of Pillared Graphene Nanosheets with Superior Potassium Storage via In-situ Growth Strategy

2021 ◽  
Author(s):  
Xiaohua Qiao ◽  
Lixia Sun ◽  
Jianhua Sun ◽  
chaoyang Hou ◽  
shuaijuan Bian ◽  
...  
Keyword(s):  
High Performance ◽  
Graphene Nanosheets ◽  
Reversible Capacity ◽  
Potassium Ion ◽  
Growth Strategy ◽  
Electrochemical Potential ◽  
In Situ Growth ◽  
Resource Abundance

Potassium ion batteries (PIBs) have been drawn much interest because of the resource-abundance and tempting electrochemical potential of potassium. However, developing high-performance anodes for PIBs with superior reversible capacity and...

scholarly journals Facile Production of Graphene/Polypropylene Composites with Enhanced Electrical and Thermal Properties through In Situ Artificial Latex Preparation

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Lijing Han ◽  
Hairui Wang ◽  
Yingxia Zong ◽  
Chengzhong Zong
Keyword(s):  
Electron Microscopy ◽  
High Performance ◽  
Blue Shift ◽  
Strong Interactions ◽  
Polypropylene Composites ◽  
Transmission Electron ◽  
Dispersion State ◽  
Pp Composites ◽  
Novel Strategy

In order to obtain the unique properties of graphene-based composites, to realize homogeneous dispersion of graphene throughout the polymer matrix remains the key challenge. In this work, edge-oxidized graphene/polypropylene (EOGr/PP) composites with well-dispersed EOGr in PP matrix, synchronously exhibiting high electrical conductivity and thermal property, were simply fabricated for the first time using a novel strategy by in situ artificial PP latex preparation in the presence of EOGr based on solution-emulsification technique. The good dispersion state of EOGr in the PP matrix was demonstrated by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). A blue shift in Raman G peak of the EOGr nanosheets was observed in the EOGr/PP composites, indicating the strong interactions between the EOGr nanosheets and the PP matrix. The onset crystallization and crystallization peak temperatures increased as the EOGr loading increases due to its good nucleating ability. An improved thermal stability of EOGr/PP composites was observed as evaluated by TGA. The EOGr/PP composites showed an insulator-to-conductor percolation transition in between that of 1 and 2 wt% EOGr content. Such strategy provides a very effective pathway to fabricate high-performance nonpolar polymer/graphene composites with excellent dispersion state of graphene.

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