A novel mica-based composite with hybrid aramid fibers for electrical insulating applications: largely improved mechanical properties and moisture resistance

2017 ◽  
Vol 67 (2) ◽  
pp. 204-211 ◽  
Author(s):  
Yongsheng Zhao ◽  
Wanbin Dang ◽  
Zhaoqing Lu ◽  
Lamei Wang ◽  
Lianmeng Si ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Moisture Resistance ◽  
Aramid Fibers

scholarly journals Influence of a bark-filler on the properties of PLA biocomposites

2021 ◽  
Vol 56 (15) ◽  
pp. 9196-9208
Author(s):  
Piotr Borysiuk ◽  
Piotr Boruszewski ◽  
Radosław Auriga ◽  
Leszek Danecki ◽  
Alicja Auriga ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Poly Lactic Acid ◽  
Moisture Resistance ◽  
Hammer Mill ◽  
Total Surface Energy ◽  
Strength Parameters ◽  
Humidity Resistance ◽  
Plastic Composites ◽  
Two Stages

AbstractIn this study, wood plastic composites (WPC) made of poly(lactic acid) PLA and a bark-filler were manufactured. Two degrees of bark comminution (10–35 mesh and over 35 mesh) and varied content of bark (40, 50 and 60%) were investigated. The studied panels were compared with analogically manufactured HDPE boards. The manufacture of composites involved two stages: at first, WPC granules with the appropriate formulation were produced using the extruder (temperatures in individual extruder sections were 170–180 °C) and crushing using a hammer mill after cooling the extruded composite; secondly, the obtained granulate was used to produce boards with nominal dimensions of 300 × 300 × 2.5 mm3 by flat pressing in a mold, using a single daylight press at a temperature 200 °C. The study proved that comminuted bark can be applied as a filler in PLA composites. However, an increase in bark content decreased mechanical properties (MOR, MOE) and deteriorated humidity resistance (high TS and WA) of the panels. Along with the increase in bark content, an increase in the contact angle of the composite surfaces and a decrease in the total surface energy were noted. It was also found that PLA composites have higher strength parameters and lower moisture resistance compared to HDPE composites with the same bark content. Graphical abstract

Posidonia oceanica leaves for processing of PMDI composite boards

2018 ◽  
Vol 53 (12) ◽  
pp. 1697-1703
Author(s):  
Aldi Kuqo ◽  
Arjan Korpa ◽  
Nikolla Dhamo
Keyword(s):  
Mechanical Properties ◽  
Residence Time ◽  
Building Material ◽  
Posidonia Oceanica ◽  
Additional Cost ◽  
Moisture Resistance ◽  
Furniture Industry ◽  
Swelling Properties ◽  
Marine Plants ◽  
Flexural Tests

Posidonia oceanica leaves (seagrass) are collected almost in all the Mediterranean seashores as spoils and disturbing material with additional cost for removal from the coastline. Seagrass, however, is known for its interesting properties, such as decay, fire and moisture resistance as well as insulation. Research for using this material in composing boards was initiated. This study looks into the possibility of using these waste marine plants for the production of alternative building material in the form of pressed panels. The paper describes the pretreatment of seagrass leaves before their processing for composite boards and the examination of its final product. The residence time for salts desorption was also determined. The main processes analyzed were the binder spraying and panel forming. Mechanical properties were evaluated by the standardized flexural tests. In addition, swelling properties were investigated. Results obtained from testing and observation of boards indicated that seagrass leaves are propitious for the application in construction and furniture industry.

scholarly journals MICROSTRUCTURE RESEARCH OF THE UNIDIRECTIONAL ORGANOPLASTIC BASED ON RUSAR-NT ARAMID FIBERS AND EPOXY-POLYSULFONE BINDER

2020 ◽  
pp. 19-26
Author(s):  
E.N. Kablov ◽  
◽  
G.S. Kulagina ◽  
G.F. Zhelezina ◽  
S.L. Lonskii ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Composite Material ◽  
Polymer Matrix ◽  
Packing Density ◽  
Tensile Tests ◽  
Polymer Composite Material ◽  
Aramid Fibers ◽  
Before And After ◽  
Binder Structure

This paper studies a polymer composite material - a unidirectional organoplastic based on Rusar-NT aramid fiber and a melt epoxy-polysulfone binder. Organoplastic has the following mechanical properties: tensile strength 2060 MPa, Young's modulus 101 GPa. The microstructure of the fiber and the polymer matrix in the organoplastic samples was studied before and after tensile tests. The features of the formation of the binder structure depending on the packing density of the fibers in organoplastics have been determined. The nature of the destruction of fibers and polymer matrix caused by the uniaxial tension has been studied.

scholarly journals Influence of Furfuryl Alcohol Fiber Pre-Treatment on the Moisture Absorption and Mechanical Properties of Flax Fiber Composites

Fibers ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 59 ◽  
Author(s):  
Yunlong Jia ◽  
Bodo Fiedler
Keyword(s):  
Mechanical Properties ◽  
Furfuryl Alcohol ◽  
Moisture Absorption ◽  
Natural Fiber ◽  
Tensile Tests ◽  
Fiber Composites ◽  
Flax Fiber ◽  
Moisture Resistance ◽  
Structural Applications ◽  
Pre Treatment

Poor moisture resistance of natural fiber reinforced bio-composites is a major concern in structural applications. Many efforts have been devoted to alleviate degradation of bio-composites caused by moisture absorption. Among them, fiber pre-treatment has been proven to be effective. This paper proposes an alternative “green” fiber pretreatment with furfuryl alcohol. Pre-treatments with different parameters were performed and the influence on the mechanical properties of fiber bundles and composites was investigated. Moisture resistance of composites was evaluated by water absorption tests. Mechanical properties of composites with different water contents were analyzed in tensile tests. The results show that furfuryl alcohol pretreatment is a promising method to improve moisture resistance and mechanical properties (e.g., Young’s modulus increases up to 18%) of flax fiber composites.

Effect of Treating Time on Mechanical Properties and Structure of Aramid Fibers during Heat Drawing

2015 ◽  
Vol 789-790 ◽  
pp. 71-74
Author(s):  
Hai Juan Kong ◽  
Peng Yang ◽  
Cui Qing Teng ◽  
Ahmed M.S. Dawelbeit ◽  
Mu Huo Yu
Keyword(s):  
Mechanical Properties ◽  
Heat Treating ◽  
Line Orientation ◽  
Wide Angle ◽  
Drawing Process ◽  
Two Dimensional ◽  
High Modulus ◽  
Aramid Fibers ◽  
Crystalline Perfection ◽  
Angle Scattering

High modulus Poly (p-phenyleneterephalamide)(PPTA) fibers was prepared by heat drawing process, in which the fibers rearranged their structures for further improvements in their crystalline perfection, crystal line orientation. The modulus of PPTA fibers could be improved when fibers treated in an appropriate condition. The influences of heat treating time on the structures of the fibers and their properties were investigated by using two-dimensional wide-angle scattering (WAXS).

scholarly journals Antimicrobial Polymeric Materials; Cellulose and m-Aramid Composite Fibers

2007 ◽  
Vol 2 (4) ◽  
pp. 155892500700200 ◽  
Author(s):  
Jaewoong Lee ◽  
R. M. Broughton ◽  
S. D. Worley ◽  
T. S. Huang
Keyword(s):  
Mechanical Properties ◽  
Antimicrobial Activity ◽  
Polymeric Materials ◽  
Composite Fiber ◽  
Wet Spinning ◽  
Gram Negative Bacteria ◽  
Composite Fibers ◽  
Aramid Fibers ◽  
Gram Negative ◽  
Chlorine Bleach

Cellulose and m-aramid were dissolved in an ionic liquid, and dry-jet wet spinning was employed to prepare composite fibers which could be rendered antimicrobial through exposure to chlorine bleach. The small domains of the m-aramid allowed a much higher accessibility and degree of chlorination than has been reported even for 100% m-aramid fibers. The mechanical properties including denier, tenacity, and strain at break were evaluated. The chlorinated composite fiber inactivated both Gram-positive and Gram-negative bacteria. The antimicrobial activity was retained after repeated washing and recharging.

Technology and Mechanical Properties of Samples Obtained by Injection From Arboform L, V3 Nature Reinforced With Aramid Fibers

2014 ◽  
Author(s):  
Dumitru Nedelcu ◽  
Constantin Carausu ◽  
Ciprian Ciofu
Keyword(s):  
Mechanical Properties ◽  
Injection Pressure ◽  
Mold Temperature ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Aramid Fibers ◽  
Injection Process ◽  
Plastic Materials ◽  
Important Trend ◽  
Manufacturing Technologies

The use of recyclable materials has become an important trend in all activity areas, reason why material based on liquid wood called Arbofill, Arboblend and Arboform will replace plastic in different applications in the near future. The new materials are the main substances that have an important effect on company development and require some simple or complex manufacturing technologies. In case of Arboform L, V3 Nature the injected parts can be obtained using the same injection machines used for the injection of plastic materials. The technological injection parameters, such as: injection pressure, injection time, cooling time, mold temperature, etc., are different. The experimental research focused on tensile strength, friction coefficients, SEM analysis, XRD analysis and EDAX analysis. Considering all of these experimental results the Arboform L, V3 Nature reinforced with aramid fibers could replace the following plastic materials PA12, PVDF, ECTFE, PA66, PA12, PC, PP, PP GF 30, etc. Also taking into account all the results obtained, this material can replace plastic materials in many applications, such as: ornaments, including for cars, connectors, switches etc., electrical industry, different mobile accessories, computers, televisions, mobile phone cases, etc. The material obtained from Arboform reinforced with aramid fibers (5% percent) improved the injection process despite of easy decreasing of mechanical properties.

scholarly journals RESIN MODIFIED GLASS IONOMER CEMENT SEBAGAI MATERIAL ALTERNATIF RESTORASI UNTUK GIGI SULUNG

2014 ◽  
Vol 1 (2) ◽  
pp. 46
Author(s):  
Diana Setya Ningsih
Keyword(s):  
Mechanical Properties ◽  
Primary Teeth ◽  
Glass Ionomer Cement ◽  
Moisture Resistance ◽  
Restorative Material ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
The World ◽  
Paper Review ◽  
Ionomer Cement

Glass ionomer cement (GIC) is a material that can release fluoride to prevent caries especially in primary teeth. One of the developments of glass ionomer cement in the world of pediatry dentistry is resin-modified glass ionomer cement (RMGIC). The resin-modified glass ionomer cement were still maintaining the clinical advantages oforiginal material, such as fluoride realease, good compatibility and aestehetically. The mechanical properties of rmgic is more higher than gic. These materials have a better adhesion, higher moisture resistance, and a longer shelft life. This paper review aims to know the ability RMGIC as alternative restorative material for primary teeth.

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