scholarly journals Polymer-matrix-bonded polyester fibers as a substitute for materials used for the cores of vacuum insulation panels

2019 ◽  
Vol 53 (4) ◽  
pp. 511-514
Author(s):  
J. Zach ◽  
V. Novák
Keyword(s):  
Polymer Matrix ◽  
Vacuum Insulation ◽  
Polyester Fibers ◽  
Materials Used

A Study on Characteristic of Polymer Matrix Composites Using Experimental and Statistical Approach

2013 ◽  
Vol 368-370 ◽  
pp. 683-686
Author(s):  
Ahmad Mubarak Tajul Arifin ◽  
Shahrum Abdullah ◽  
Rozli Zulkifli ◽  
Dzuraidah Abd Wahab
Keyword(s):  
Polymer Matrix ◽  
Statistical Approach ◽  
Polymer Matrix Composites ◽  
Stacking Sequence ◽  
Matrix Composites ◽  
The Matrix ◽  
Thermoset Epoxy ◽  
Chopped Strand Mat ◽  
Materials Used ◽  
And Behavior

This paper focuses on the characteristic study of polymer matrix composites using a statistical approach, in terms of difference experimental and reflected to difference stacking sequence and orientation of composite lamination. Composite material, have an excellent characteristic and behavior, but with a difference application and materials used, it have a difference phenomenon occurred before the composite structure are collapsed. Therefore, in order to understand the characteristic of polymer matrix composites, it needs to investigate the phenomenon that influences the structure of composite lamination before failures. In this research, polymer matrix composites are produced using difference material and stacking sequence of lamination. The matrix used is thermoset epoxy and polyester resin with chopped strand mat (CSM) and woven roving (WR) as reinforcement materials. It has been produced using hand lay-up technique. The experimental work is carried out using the tension and flexural test accordance to ASTM-D3039 and D-D790 standard. By using a statistical approach, it can clearly show the differential between materials used with a characteristic of composite materials. It is noted, based on this investigation it also showed difference phenomenon failures and damage structure of polymer matrix composites with difference type of experimental.

Justification of the Choice Matrix Material of the Magnetoactive Elastomer for Working Camera-Channel Peristaltic Unit

2016 ◽  
Vol 870 ◽  
pp. 13-19 ◽  
Author(s):  
Maria A. Vasilyeva
Keyword(s):  
Polymer Matrix ◽  
Smart Materials ◽  
Matrix Material ◽  
Polymeric Materials ◽  
High Viscosity ◽  
New Techniques ◽  
Materials Used ◽  
Pumping Units ◽  
Material Studies ◽  
Resultant Material

The article analyzes the promising polymeric materials to be used as a template in the manufacture of magnetoactive elastomers (MAEs). MAEs belong to the group of so-called smart materials; they can be used to creeate new techniques and technologies. MAEs are promising materials used to manufacture the working chamber of pumping units for the implementation of peristaltic movements in highly viscous and highly condensed substances. Environments, which is in contact with an element of MAEs, specifically high viscosity asphaltenic oil, impose substantial restrictions on the choice of the polymer matrix for its production, taking into consideration the influence of the material selected to modify the rheological properties of the resultant material. Studies of fluoropolymers basic properties have been conducted. According to their results it is concluded that fluorine-containing polymers can be used as the polymer matrix to manufacture MAEs in contact with aggressive high viscosity substances.

Transparent conductive nanocomposite layers with polymer matrix and silver nanowires reinforcement

2018 ◽  
Vol 2 (93) ◽  
pp. 59-84 ◽  
Author(s):  
L.A. Dobrzański ◽  
B. Nieradka-Buczek
Keyword(s):  
Electrical Properties ◽  
Polymer Matrix ◽  
Energy Gap ◽  
Light Transmission ◽  
Silver Nanowires ◽  
Matrix Material ◽  
Light Waves ◽  
Composite Layers ◽  
The Matrix ◽  
Materials Used

Purpose: The article deals with one of the completely new groups of composite inorganic nanostructured materials used in the form of surface layers, characterised by unique properties, such as transparency over 84.4% in the field of visible light waves, anti-reflective and electrical properties comparable to semiconductors. Design/methodology/approach: A technology for producing such layers containing not less than 5% of silver nanowires by mixing a colloid containing silver nanowires from fragmented agglomerates by ultrasound homogeniser with the polymer dissolved in chloroform with good bonding to the polymer matrix and of good quality was developed. Findings: It was shown that increasing the content of silver nanowires to 30% in composite layers causes an increase in the refractive coefficient from 1.9 to 2.2 and a decrease in light transmission from 88.1 to 81.9% and a decrease in the value of light reflection from 11.1% up to 6.7%. With an increased content of silver nanowires, these layers show better electrical properties, and the width of the energy gap is reduced from 3.93 eV to 1.60 eV. Composite layers with a mass fraction greater than 5% of silver nanowires show properties analogous to semiconductors despite the metallic nature of their conductivity. Research limitations/implications: The use of silver nanowires as a reinforcement of transparent nanocomposite layers with a poly(methyl methacrylate) PMMA matrix improves selected optical and electrical properties as a result of the uniform distribution of the reinforcing phase in the matrix material. Originality/value: The influence of the content of silver nanowires, layering conditions, applied methods of dispersing silver nanowires in the matrix material on the structure and properties of newly developed nanocomposite layers was determined.

scholarly journals Super Insulation Materials—An Application to Historical Buildings

Buildings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 525
Author(s):  
Brigitta Vajó ◽  
Ákos Lakatos
Keyword(s):  
Thermal Insulation ◽  
Sandwich Panels ◽  
Conductivity Measurement ◽  
Historical Buildings ◽  
Historical Building ◽  
Insulation Materials ◽  
Vacuum Insulation ◽  
Measurement Results ◽  
Materials Used

The main purpose of this paper is to present the use of super thermal insulation materials for a historical building through a calculation-based case study. The development of the insulation materials is based on the objective of making buildings as energy efficient as possible, and the energy loss should be kept to a minimum, for both new and existing buildings. For this purpose, the thermal insulation materials used so far have not always achieved maximum effectiveness. In the case of historical buildings, it is particularly difficult to solve insulation issues, as the building cannot lose its former appearance. However, aerogel and vacuum insulation panels can also be used as thin thermal protective layers. In this paper, we will specifically deal with the presentation of the possible application of super thermal insulation materials, such as vacuum insulation panels and aerogels. We will present thermal conductivity measurement results as well as their application through building energetic calculations applied to a historical building as a case study. We will also present certain calculations regarding the costs. The paper highlights that savings of energy costs of approximately 30% can be reached using vacuum insulation sandwich panels. Furthermore, the overall thermal transmittance of the building also decreases by about 35% if vacuum insulation sandwich panels are used for the refurbishment.

scholarly journals Experimental Verification of Use of Vacuum Insulating Material in Electric Vehicle Headliner to Reduce Thermal Load

2019 ◽  
Vol 9 (20) ◽  
pp. 4207 ◽  
Author(s):  
Baek ◽  
Lee ◽  
Kim
Keyword(s):  
Thermal Conductivity ◽  
Energy Conditions ◽  
Insulation Material ◽  
Cooling Period ◽  
Vacuum Insulation ◽  
Heating And Cooling ◽  
Cabin Temperature ◽  
Materials Used ◽  
Insulation Performance ◽  
Reduced Surface

In electric vehicles (EVs), the use of high-temperature heat transfer components that effectively block external heat and minimize cooling losses can increase vehicle mileage during heating/cooling operations and improve passenger comfort. In particular, in ensuring high thermal insulation, the car headliner forms an important component for effectively managing environmental heat energy and heating and cooling processes inside the EV. In this study, we have proposed and experimentally verified the use and efficacy of vacuum insulation material in the headliner of EVs to reduce the heat load. The thermal conductivity and air permeability of various conventional insulating and vacuum insulation materials used for the headliner were compared to accurately predict the vacuum insulation material performance. We found that the vacuum insulation material affords reduced surface roughness and thermal conductivity and high formability relative to conventional insulation. We also confirmed consequent improvements in the insulation performance by comparing the characteristics of the proposed vacuum-insulation-material headliner (relative to conventional materials) via prototyping and reliability testing. With the “improved” headliner, in summer, the temperature of the automobile cabin was lowered by 2.8 °C, and the cabin temperature was lowered by 3.9 °C during the cooling period relative to conventional insulators, which proves that the cabin temperature can be maintained at a low value during summer parking or cooling. In winter, the cabin temperature was found to be 7.7 °C higher than that obtained with the conventional insulator, which indicates that the cabin temperature can be maintained higher via reduction in the heat loss (because of using vacuum insulation) under the same heating energy conditions during winter.

Thermo-Oxidative Behavior of Carbon Black Composites for Self-Regulating Heaters

2019 ◽  
Vol 34 ◽  
pp. 66-80
Author(s):  
Radu Setnescu ◽  
Marius Lungulescu ◽  
Adela Bara ◽  
Alina Caramitu ◽  
Sorina Mitrea ◽  
...  
Keyword(s):  
Carbon Black ◽  
Polymer Matrix ◽  
Elevated Temperatures ◽  
Conductive Filler ◽  
Limiting Factor ◽  
Conductive Composites ◽  
Major Interest ◽  
Materials Used ◽  
Crystallinity Changes ◽  
Physical Changes

The composite materials for self-regulating heaters are conductive composites based on a polymer matrix and a dispersed conductive filler consisting in either carbon black or another carbon material, such as graphite or nanotubes. Similar materials are suitable for sensors and current limitations. As these materials used in heating applications work usually at elevated temperatures in presence of air, the ageing processes would be an important limiting factor of their lifetime. Therefore, thermal oxidation processes and crystallinity changes during the service of these products are of major interest in durability studies. The potential interference of carbon-based materials with the oxidation and ageing of polymer matrix shall be known in order to correctly estimate the durability of such materials. The effect of radiation exposure is studied taking into account the potential use of such materials in radiation environments. In this work, the activation energies of some initial, unaged and aged products at elevated temperatures are compared in order to characterize the effect of thermo-oxidative ageing and hence to evaluate their durability. The effect of some antioxidants is also discussed. The crystallinity, calculated from DSC was used for evaluation of the physical changes induced within the aged materials, following the procedures described in previous work. FTIR-ATR technique was used for characterization of chemical changes induced by ageing.

Effect of Nanofiller on Flexing Mechanism of HDPE/EPR Nanocomposite for Sport Shoe Sole Application

2015 ◽  
Vol 1115 ◽  
pp. 382-385 ◽  
Author(s):  
Husniyah Aliyah Lutpi ◽  
Hazleen Anuar ◽  
N.M. Shaffiar
Keyword(s):  
Electron Beam ◽  
Polymer Matrix ◽  
High Density Polyethylene ◽  
High Density ◽  
Melt Blending ◽  
Ethylene Propylene ◽  
Sport Shoe ◽  
New Development ◽  
Materials Used ◽  
Internal Mixer

For this decade, nanocomposite has received huge interest from over a thousand of researchers due to its outstanding properties in wide applications. Nanocomposite of sole shoes has become new development in sport shoes application while no interest from others has been reported. The purpose of this study is mainly to produce prototype and characterize flexing mechanism of nanocomposite outsole. The materials used for the outsole protoype were polymer matrix of high density polyethylene (HDPE) and ethylene propylene rubber (EPR) at ratio of 70:30 by wt% was added by 3 wt% of CNT nanofiller. The HDPE/EPR-CNT nanocomposites were prepared via single melt blending by using internal mixer and then compression moulded into outsole shape. The outsole was then gone through electron beam (EB) radiation at 100 kGy/s. The flexibility of unradiated and radiated nanocomposite outsole were tested by flexing test according to SATRA TM161 and ISO-17707 standard and fractography of the nanocomposite outsole was observed visually. EB radiated nanocomposite show high properties which suggesting that greater count number in flexing test and less void was observed compared to the unradiated nanocomposite.

Structural Characterization of Poly(Sodium 4-Styrene Sulfonate)/CdS Semiconductor Nanoparticle Composites

2010 ◽  
Vol 644 ◽  
pp. 123-127
Author(s):  
Matthew P. Espe ◽  
Saida Y. Ortiz-Colon ◽  
Arturo Ponce ◽  
Ronald F. Ziolo
Keyword(s):  
Polymer Matrix ◽  
Bulk Heterojunction ◽  
Composite Films ◽  
Water Soluble ◽  
Capping Agent ◽  
Water Soluble Polymers ◽  
Semiconductor Nanoparticle ◽  
Composites Materials ◽  
Materials Used

The properties of polymer/semiconducting nanoparticle (NP) composites-materials used in hybrid, bulk-heterojunction photovoltaic materials-are dependent on the interaction of the NPs and polymer. Composite films of water soluble polymers and CdS NPs have been produced both by synthesizing the NPs within the polymer matrix and by adding the CdS NPs, containing a capping agent, to the polymer. The composites have been characterized by microscopy as well as 1H, 13C and 113Cd solid-state NMR. When synthesizing the NPs within the polymer, the polymer matrix plays a role in the cadmium sulfide NP nucleation, growth and structure. In the blended system, the dominant interaction between the glycerol capping agent and sulfonated polymer is observed to be hydrogen bonding.

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