Polyurethane Nanocomposite Films by Using Cellulose Nanospheres as Green Nanofillers

2014 ◽  
Vol 1052 ◽  
pp. 65-68
Author(s):  
Zhang Gen Ni ◽  
Zhen Jun Dou ◽  
Tao Lin ◽  
Miao Cheng ◽  
Zong Yi Qin
Keyword(s):  
Polar Solvent ◽  
Testing Machine ◽  
Thermal Characterization ◽  
Nanocomposite Films ◽  
Infrared Spectrometry ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Universal Testing ◽  
Critical Challenge

To overcome poor mechanical properties of polyurethane, carboxylated cellulose nanospheres were incorporated into polyurethane in an organic polar solvent, dimethylformamide to prepare the nanocomposite films. Morphological, structural, mechanical and thermal characterization of the nanocomposites was done with scanning electron microscopy, Fourier transform infrared spectrometry, micro–control electronic universal testing machine and thermal gravimetric analysis. The critical challenge to achieve high macroscale properties of the bulk nanocomposites is the ability to obtain well–dispersed cellulose nanospheres in polymer matrices.

Simultaneous Improvement of Mechanical Properties and Thermal Stability of Polyurethane by Polyethylene Glycol Grafted Cellulose Nanocrystals

2014 ◽  
Vol 1052 ◽  
pp. 249-253 ◽  
Author(s):  
Zhen Jun Dou ◽  
Miao Cheng ◽  
Yun Feng Qin ◽  
Long Chen ◽  
Zong Yi Qin
Keyword(s):  
Polyethylene Glycol ◽  
Cellulose Nanocrystals ◽  
Testing Machine ◽  
Nanocomposite Films ◽  
Infrared Spectrometry ◽  
Mechanical And Thermal Properties ◽  
Gravimetric Analysis ◽  
Universal Testing ◽  
Thermal Stability Of ◽  
Polyurethane Matrix

A study of the effect of the addition of polyethylene glycol grafted cellulose nanocrystals on the properties of a polyurethane matrix was carried out. The resulting nanocomposite films were characterized by scanning electron microscopy, Fourier transform infrared spectrometry, micro–control electronic universal testing machine and thermal gravimetric analysis. Remarkable improvements in the mechanical and thermal properties of polyurethane could be attributed to well–dispersion of nanofillers in polyurethane matrix and the formation of hydrogen bonding network within the polymer matrix.

Preparation and Characterization of Moisture-Cure Polyurethane for Bonding Wood

2014 ◽  
Vol 563 ◽  
pp. 102-106
Author(s):  
Jing Du ◽  
Meng Meng Zhou ◽  
Ling Ling Ma ◽  
Fei Cao ◽  
Ji Jun Xiao
Keyword(s):  
Thermal Analysis ◽  
Testing Machine ◽  
High Thermal Stability ◽  
Strength Increase ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Universal Testing ◽  
Polyurethane Film ◽  
Tensile Strength Increase

Abstract. In this work, one-component moisture-cure polyurethane was synthesized, which is mainly used as adhesives for bonding wood. The properties of the polyurethane were characterized by Fourier Transform Infrared Spectroscopy(FTIR), thermal gravimetric analysis(TGA), dynamic mechanical thermal analysis(DMA) and electronic universal testing machine. The results indicate that the shear strength and tensile strength increase with increasing of NCO/OH ratio in 2 to 4, however, when the ratio more than 4, it will be decreased gradually. The TGA and DMA results show that the polyurethane film has relatively high thermal stability with a weight loss of 5% at 298 °C and the glass transition temperature is 97.52 °C.

scholarly journals Fabrication and characterization of hexadecyl acrylate cross-linked phase change microspheres

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 69-75
Author(s):  
Haoran Yun ◽  
Xingxiang Zhang
Keyword(s):  
Phase Change ◽  
Smooth Surface ◽  
Bone Conduction ◽  
Cross Linking ◽  
Gravimetric Analysis ◽  
Orthopedic Implant ◽  
Thermal Gravimetric ◽  
Fabrication And Characterization ◽  
Fast Release

AbstractMicrospheres with phase change properties were fabricated by polymerization of hexadecyl acrylate (HA) and different cross-linking agents. The samples were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA). The results show that, the samples that added cross-linking agents have a smooth surface and the latent heat of them is different. The experiments show that all of the cross-linked copolymer shells can be made into temperature controlled release microspheres. These materials can be potentially applied in the field of thermal energy storage. β-tricalcium phosphate was encapsulated in microspheres to obtain one with a fast release effect. It will effectively promote bone conduction when these microspheres were implanted into a bone defect. This microsphere can be used for orthopedic implant or coating of instrument in the future.

Synthesis, Structure, and Characterization of La1−xBax (0 ≤ x ≤ 1)

1992 ◽  
Vol 271 ◽  
Author(s):  
Joseph E. Sunstrom ◽  
Susan M. Kauzlarich
Keyword(s):  
Magnetic Susceptibility ◽  
Powder Diffraction ◽  
Single Phase ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Temperature Dependent ◽  
X Ray ◽  
Early Transition Metal ◽  
Arc Melting

ABSTRACTThe compounds La1−xBaxTiO3 (0 ≤ × ≤ 1) have been prepared by arc melting stoichiometric amounts of LaTiO3 and BaTiO3. Single phase samples can be made for the entire stoichiometry range. The polycrystalline samples have been characterized by thermal gravimetric analysis, X-ray powder diffraction, and temperature dependent magnetic susceptibility. This series of compounds has been studied as a possible candidate for an early transition metal superconductor.

scholarly journals Characterization of Composite Laminates Subjected to Repeated Indentation

2014 ◽  
Vol 14 (2) ◽  
pp. 46-56
Author(s):  
M. Ashok Kumar ◽  
A.M.K. Prasad ◽  
D.V. Ravishankar ◽  
G. Giridhar
Keyword(s):  
Stainless Steel ◽  
Bearing Capacity ◽  
Fiber Orientation ◽  
Composite Laminates ◽  
Testing Machine ◽  
High Strength ◽  
Surface Damage ◽  
Load Bearing Capacity ◽  
Universal Testing

Abstract The effect of the fiber orientation in a laminate is investigated experimentally when subjected repeated quasistatic indentation. All the laminates with different fiber orientation are subjected to indentation with a stainless steel spherical indenter of diameter 8.0mm on a universal testing machine for a maximum indenter displacement of 4mm. The rate of indenter displacement was 0.5mm/minute. Different parameters like load bearing capacity, indentation diameter, area of surface damage, etc., were recorded after 4mm of indenter displacement. All the parameters were studied and compared to evaluate the laminate with high strength

Synthesis and characterization of diaminomaleonitrile-functionalized polystyrene grafts for application in pervaporation separation

2008 ◽  
Vol 62 (4) ◽  
Author(s):  
Hamada Abdel-Razik
Keyword(s):  
Chemical Structure ◽  
Thermal Characteristics ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Optimum Conditions ◽  
Scanning Calorimetry ◽  
Phenol Water ◽  
Pervaporation Separation ◽  
Thermal Stability Of

AbstractSynthesis, characterization and application of diaminomaleonitrile (DAMN)-functionalized polystyrene grafts were studied. Dibenzoyle peroxide (BP) was used as an initiator. Optimum conditions for grafting were found to be c(DAMN) = 0.5 M, c(BP) = 0.016 M, θ = 85 °C and t = 4 h. Water uptake of the polystyrene graft membranes was found to increase with the increase of the grafting yield. The chemical structure, thermal characteristics and thermal stability of the obtained membranes were investigated by means of FTIR spectroscopy, differential scanning calorimetry, and thermal gravimetric analysis. Polystyrene graft membrane with the degree of grafting of up to 96 % was found to be useful for the pervaporation separation of phenol/water mixtures.

Synthesis and Characterization of Red Mud and Sawdust Based Geopolymer Composites as Potential Construction Material

2018 ◽  
Vol 923 ◽  
pp. 130-134 ◽  
Author(s):  
Ing Kong ◽  
Kay Min Khoo ◽  
Oliver Buddrick ◽  
Abdul Aziz Baharuddin ◽  
Pooria Khalili
Keyword(s):  
Compressive Strength ◽  
Red Mud ◽  
Raw Materials ◽  
Construction Material ◽  
Testing Machine ◽  
Industrial Wastes ◽  
Sem Images ◽  
Universal Testing ◽  
Geopolymer Composites

The aim of this study was to synthesize the geopolymer composites formed by two industrial wastes, namely red mud (RM) and saw dust (SD). SD was chemically treated with alkali for the removal of lignin and subsequently bleached, before forming composite with acid-modified RM. The composites were then characterized by using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetic analysis (TGA) and universal testing machine to study the morphology, chemical, thermal and mechanical properties. The FTIR spectrum showed that Si and Al from the raw materials played the major role in forming aluminosilicate geopolymer composites. The SEM images revealed that SD and RM particles aggregated to form fully condensed geopolymer matrices with high compressive strength of 8.3-138 MPa, which were comparable to Portland cement (compressive strength of 9-20.7 MPa).

Characterization of the electrocatalytic activity of carbon-supported platinum-based catalysts by thermal gravimetric analysis

2015 ◽  
Vol 25 (6) ◽  
pp. 468-469 ◽  
Author(s):  
Igor N. Leontyev ◽  
Daria V. Leontyeva ◽  
Alexandra B. Kuriganova ◽  
Yurii V. Popov ◽  
Olga A. Maslova ◽  
...  
Keyword(s):  
Thermal Gravimetric Analysis ◽  
Electrocatalytic Activity ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Supported Platinum

Preparation and Characterization of Polysulfone Membrane for Gas Separation

2014 ◽  
Vol 917 ◽  
pp. 307-316 ◽  
Author(s):  
Norwahyu Jusoh ◽  
Lau Kok Keong ◽  
Azmi Mohd Shariff
Keyword(s):  
Polymer Concentration ◽  
Testing Machine ◽  
Skin Layer ◽  
Polysulfone Membrane ◽  
Thermogravimetric Analyzer ◽  
Membrane Fabrication ◽  
Universal Testing ◽  
Infra Red ◽  
Methyl Pyrrolidone

Symmetric and asymmetric polysulfone membranes were fabricated using different of solvents; N-methyl-pyrrolidone (NMP), Tetrahydrofuran (THF) and Dimethylacetamide (DMAC) at different polymer concentration (15 and 20%) to study the influence of varying type of solvents and polymer concentration in membrane fabrication. The membranes were characterized using Field Emission Scanning Electron Microscopy (FESEM), Thermogravimetric Analyzer (TGA), Universal Testing Machine (UTM) and Fourier Transform Infra-Red (FTIR).The results disclosed that the symmetric, higher polymer concentration membrane contributed to better thermal and mechanical stabilities. PSF/THF membrane showed good mechanical strength while PSF/DMAC membrane illustrated great thermal stability. 20% of polymer concentration and PSF/THF membrane led to the thicker skin layer and dense structure formation.

scholarly journals Manufacture and Characterization of Alginate-CMC-Dextran Hybrid Double Layer Superabsorbent Scaffolds

2021 ◽  
Vol 11 (23) ◽  
pp. 11573
Author(s):  
Jeongyeon Choi ◽  
Heekyung Jeon
Keyword(s):  
Freeze Drying ◽  
Antibacterial Agents ◽  
Testing Machine ◽  
Hacat Cells ◽  
Morphological Stability ◽  
Drying Method ◽  
Natural Polymers ◽  
Universal Testing ◽  
Medical Material

This study focused on the manufacturing of functional superabsorbent sponges using natural polymers. An alginate/CMC-embedded dextran hybrid dual-layer formulation was prepared using the freeze-drying method. The physical properties of the formulation were characterized using a field emission scanning electron microscope and a universal testing machine, and the swelling ratio was calculated. Cell viability assays were performed using keratinocytes (HaCaT cells). The results showed that this formulation can absorb a large amount of moisture and provide morphological stability through its tensile strength and uniform porosity, and this was verified by its biocompatibility. We believe that in the future, by combining this novel hybrid dual-layer superabsorbent sponge with antibacterial agents with excellent porosity, it would serve as a medical material for producing bandages that can absorb blood and body fluids, feminine hygiene products, and functional antibacterial masks.

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