Research Progress on Ultraviolet Resistance Performance of PMIA Fiber

2012 ◽  
Vol 463-464 ◽  
pp. 773-776 ◽  
Author(s):  
Shao Gui Wu ◽  
Jun Zhou ◽  
Ya Ru Fan
Keyword(s):  
Mechanical Performance ◽  
Ultra Violet ◽  
Research Progress ◽  
Structure Stability ◽  
Melt Mixing ◽  
Significant Drop ◽  
Ultraviolet Resistance ◽  
Uv Absorbers ◽  
Promising Solution ◽  
Resistance Performance

In this paper, the photodegradation mechanism of PMIA under ultraviolet light is described in detail. Due to the presence of amide groups, the molecular chains are easily to be broken by exposure to ultra-violet light, which leads to the significant drop of the PMIA’s mechanical performance and meanwhile the fiber’s color becomes dark. To improve the UV resistance performance of PMIA, two methods have been discussed. The first method is melt-mixing, by adding UV absorbers to PMIA, such as benzophenone, triazine, benzotriazole and hindered anime etc. These UV absorbers consume the ultraviolet light’s energy and protect polymeric and other light-sensitive materials from degradation by sunlight or UV. The second method is adding monomers with ultraviolet resistance during the polymerization. This is a promising solution allowing better structure stability of PMIA.

scholarly journals State-of-the-Art Review on Experimental Investigations of Textile-Reinforced Concrete Exposed to High Temperatures

2021 ◽  
Vol 5 (11) ◽  
pp. 290
Author(s):  
Panagiotis Kapsalis ◽  
Tine Tysmans ◽  
Danny Van Hemelrijck ◽  
Thanasis Triantafillou
Keyword(s):  
Reinforced Concrete ◽  
High Temperatures ◽  
Mechanical Response ◽  
Mechanical Performance ◽  
State Of The Art ◽  
Experimental Investigations ◽  
Textile Reinforced Concrete ◽  
Structural Applications ◽  
Promising Solution ◽  
Good Heat Resistance

Textile-reinforced concrete (TRC) is a promising composite material with enormous potential in structural applications because it offers the possibility to construct slender, lightweight, and robust elements. However, despite the good heat resistance of the inorganic matrices and the well-established knowledge on the high-temperature performance of the commonly used fibrous reinforcements, their application in TRC elements with very small thicknesses makes their effectiveness against thermal loads questionable. This paper presents a state-of-the-art review on the thermomechanical behavior of TRC, focusing on its mechanical performance both during and after exposure to high temperatures. The available knowledge from experimental investigations where TRC has been tested in thermomechanical conditions as a standalone material is compiled, and the results are compared. This comparative study identifies the key parameters that determine the mechanical response of TRC to increased temperatures, being the surface treatment of the textiles and the combination of thermal and mechanical loads. It is concluded that the uncoated carbon fibers are the most promising solution for a fire-safe TRC application. However, the knowledge gaps are still large, mainly due to the inconsistency of the testing methods and the stochastic behavior of phenomena related to heat treatment (such as spalling).

Revaluation of Australian palm residues in polypropylene composites: Statistical influence of fiber treatment

2020 ◽  
pp. 002199832096053 ◽  
Author(s):  
Noelle C Zanini ◽  
Rennan FS Barbosa ◽  
Alana G de Souza ◽  
Derval S Rosa ◽  
Daniella R Mulinari
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Mechanical Performance ◽  
Alkali Treatment ◽  
Mechanical Analysis ◽  
Melt Mixing ◽  
Polypropylene Composites ◽  
Matrix Interactions ◽  
Fiber Treatment ◽  
Fiber Matrix

Australian palm residues are generated by palm heart industry in large quantities and are considered an underused material with a composition rich in lignocellulosic structures. This residue is generally utilized as briquettes for energy or sheep feed; however, few works investigate this residue as composite fillers. This work aimed to revalue Australian palm residues (PR) by preparing polypropylene composites through melt mixing, using different fiber contents (0, 5, 10, 20, and 30 wt%), and evaluate the statistical influence of fibers (residues) alkali treatment (MPR) in composites mechanical properties. PR and MPR were evaluated by FTIR, XRD, SEM, TGA, and composites were assessed using thermal and mechanical analysis, in which ANOVA statistical analysis was applied. The residues addition increased the mechanical properties and their treatment enhanced the stiffness of the composites compared to pristine PP. However, ANOVA demonstrated that at low residues contents, surface treatment does not increase fiber-matrix interactions effectively, then tensile properties were statistically similar to PP. Considering tensile properties, 20% MPR showed statistically distinct properties, with significative enhancements; no filler contents dependence was verified. Flexural properties were more sensitive to residue loading, and composites with 30% PR and MPR presented superior mechanical performance. This difference is associated with a higher sensitivity of tensile stress towards fiber-matrix interactions, which was improved with fiber treatment. Also, the residues content and treatment influenced the composites' thermal stability, with better results for PP-MPR. Results indicate that palm residue is an excellent filler for improving composites' thermal and mechanical properties, with a greener character.

scholarly journals Mechanical performance of roselle/sugar palm fiber hybrid reinforced polyurethane composites

BioResources ◽  
2018 ◽  
Vol 13 (3) ◽  
pp. 6238-6249
Author(s):  
A. M. Radzi ◽  
S. M. Sapuan ◽  
M. Jawaid ◽  
M. R. Mansor
Keyword(s):  
Impact Strength ◽  
Mechanical Performance ◽  
Hybrid Composites ◽  
Testing Machine ◽  
Morphological Properties ◽  
Scanning Electron Micrographs ◽  
Melt Mixing ◽  
Palm Fiber ◽  
Sugar Palm Fiber ◽  
Scanning Electron

The effect of sugar palm fiber (SPF) loading was studied relative to the mechanical properties of roselle (RF)/SPF/thermoplastic polyurethane (TPU) hybrid composites. RF/SPF/TPU hybrid composites were fabricated at different weight ratios (100:0, 75:25, 50:50, 25:75, and 0:100) by melt mixing and hot compression. The mechanical (tensile, flexural, and impact test) and morphological properties of tensile fractured samples were examined using a universal testing machine, impact machine, and scanning electron microscope. It was found that the hybridization of RF/SPF increased its impact strength corresponding to the increases in the SPF content of the composites. The tensile and flexural properties of the hybrid composites decreased due to poor interfacial bonding between the fiber and matrix. Scanning electron micrographs of the tensile fractured surface of the RF/SPF hybrid composites revealed fiber pullouts and poor adhesion bonding. In conclusion, the hybridization of SPF with RF/TPU composites enhanced its impact strength while decreasing the tensile and flexural strength.

Research Progress on Mechanical Properties of Short Carbon Fibre/Epoxy Composites

2019 ◽  
Vol 12 (1) ◽  
pp. 3-13 ◽  
Author(s):  
Guanghui Zhao ◽  
Jijia Zhong ◽  
Y.X. Zhang
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Mechanical Performance ◽  
Experimental Studies ◽  
Weight Ratio ◽  
Epoxy Composites ◽  
Experimental Techniques ◽  
Research Progress ◽  
Future Research ◽  
Short Carbon

Background: Short carbon fibre reinforced epoxy composites have many advantages such as high strength-to-weight ratio, corrosion resistance, low cost, short fabrication time and easy manufacturing. Researches on the mechanical performance of the composites are mainly carried out by means of experimental techniques and numerical calculation. Objective: The study aims to report the latest progress in the studies of mechanical properties of short carbon fibre reinforced epoxy composites. Methods: Based on recently published patents and journal papers, the experimental studies of short carbon fibre reinforced epoxy composites are reviewed and the effects of short carbon fibre on the mechanical properties of the composites are discussed. Numerical studies using representative volume element in simulating macroscopic mechanical properties of the short fibre reinforced composites are also reviewed. Finally, future research of short carbon fibre reinforced epoxy composites is proposed. Results: Experimental techniques, experimental results and numerical simulating methods are discussed. Conclusion: Mechanical properties of epoxy can be improved by adding short carbon fibres. Fiber surface treatment and matrix modification are effective in enhancing interfacial adhesion between fiber and matrix, and as a result, better mechanical performance is achieved. Compared to the studies on equivalent mechanical properties of the composites, researches on the micro-mechanism of interaction between fiber and matrix are still in infancy due to the complexity of both the internal structure and reinforcing mechanism.

scholarly journals Manufacture of Hybrid Natural/Synthetic Fiber Woven Textiles for Use in Technical Biocomposites with Maximum Biobased Content

2019 ◽  
Vol 3 (2) ◽  
pp. 43 ◽  
Author(s):  
Madina Shamsuyeva ◽  
Jana Winkelmann ◽  
Hans-Josef Endres
Keyword(s):  
Epoxy Resin ◽  
Feasibility Study ◽  
High Performance ◽  
Mechanical Performance ◽  
Synthetic Fiber ◽  
Flexural Properties ◽  
Synthetic Fibers ◽  
Flax Fibers ◽  
Promising Solution ◽  
Biobased Content

This feasibility study investigates the flexural properties of biocomposites containing woven flax textiles (plain, twill, satin) and woven twill patterned hybrid textiles containing flax-/glass or flax-/carbon mixture for lightweight applications. Synthetic fibers are integrated as weft and flax fibers are integrated as warp yarns using a double-rapier weaving machine with a Jacquard attachment. The corresponding biocomposites are manufactured via vacuum infusion process using a biobased epoxy resin as a matrix. The manufactured biocomposites are analyzed with regard to their density and flexural properties. The results show that the use of hybrid textiles offers a promising solution for the manufacture of biocomposites with a higher biobased content and significantly improved flexural properties. Furthermore, the introduction of high-performance synthetic fibers in textiles enables the manufacture of biocomposites with an isotropic mechanical performance.

Optical Properties of Zn-Doped CeO2 Nanoparticles as a Function of Zn Content

2014 ◽  
Vol 896 ◽  
pp. 108-111 ◽  
Author(s):  
Iis Nurhasanah ◽  
Heri Sutanto ◽  
Ririn Futikhaningtyas
Keyword(s):  
Visible Region ◽  
Ultra Violet ◽  
Fluorite Structure ◽  
Zinc Nitrate ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Zn Content ◽  
Uv Absorbers

CeO2 and Zn-doped CeO2 nanoparticles were synthesized by simple precipitation method in water/isopropanol mixed solvent from cerium nitrate and zinc nitrate with various mole ratios. The precipitates were then calcined at 300°C for 4 hours and characterized by X-ray diffraction (XRD) and uv-vis spectroscopy. Characterization by x-ray diffraction shows that high crystallinity of cubic fluorite structure of CeO2 with crystallite size in the range 6 12 nm depending on Zn content. CeO2 nanoparticles exhibits tranparent in the visible region and strong absorbance in the ultra-violet region. It was also found that significant effect of Zn content on transmittance and optical band gap. In addition, Zn substitution into Ce suppressing photocatalytic activity of pure CeO2 nanoparticle under sunlight irradiation. These results suggest that Zn-doped CeO2 nanoparticle is more prommising for safer optical UV-absorbers.

scholarly journals Photostability of HDPE Filaments Stabilized with UV Absorbers (UVA) and Light Stabilizers (HALS)

2013 ◽  
Vol 8 (1) ◽  
pp. 155892501300800
Author(s):  
Bhupendra Singh Butola ◽  
Mangala Joshi
Keyword(s):  
Tensile Properties ◽  
Ultra Violet ◽  
Uv Resistance ◽  
Protection Factor ◽  
Artificial Weathering ◽  
Varying Thickness ◽  
Uv Absorbers ◽  
The Stability ◽  
Hindered Amine Light Stabilizers ◽  
Outdoor Weathering

HDPE monofilaments were photostabilized with hindered amine light stabilizers (HALS) and UV absorbers at varying stabilizer concentrations. The filaments were assessed for UV resistance by exposure to simulated outdoor weathering conditions in artificial weathering apparatus and testing the exposed samples at regular intervals for retained tensile properties. Films of HDPE of varying thickness and containing different concentrations of photostbilizers were also prepared. The UV protective ability of the films was assessed by measuring Ultra Violet Protection Factor (UPF). The results indicate that UV absorbers improve the stability of the filaments significantly. However, the best performance was displayed by filaments containing HALS.

Study on Performance of Epoxy Asphalt Concrete Applied in the Deck Pavement of Pingsheng Steel Bridge

2010 ◽  
Vol 150-151 ◽  
pp. 470-474 ◽  
Author(s):  
Wen Qiang Wang ◽  
Hua Yan He
Keyword(s):  
Asphalt Concrete ◽  
Performance Test ◽  
Mechanical Performance ◽  
Asphalt Mixture ◽  
Practical Case ◽  
Steel Bridge ◽  
Linear Contraction ◽  
Epoxy Asphalt ◽  
Resistance Performance ◽  
Epoxy Asphalt Concrete

As a fair deck pavement material of its kind used in steel bridge, the epoxy asphalt concrete is considered much more superior to ordinary asphalt concrete in terms of road performance, while still greatly subject to the level of design and construction. Starting from a practical case of the epoxy asphalt concrete that has been applied in the deck pavement of Pingsheng Steel Bridge, this paper centers on a comprehensive study and discussion of the epoxy asphalt mixture, specifically in aspects of physical and mechanical performance test of stability under high temperature, performance under low temperature, tortuosity, immersion stability, linear contraction performance, fatigue performance and oil-erosion resistance performance. This will provide positive instruction for future deck pavements on steel bridges.

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