“…32,33 At the same time, the introduction of a large number of hollow structures lengthens the path of heat transfer, slowing down the rate of heat transfer, and improving the insulation performance of the material. 34–37 Figure 9.Thermal conductivity of PIF with different M-HGM contents (a). Picture and infrared images of EPSF, PIF-8, and PIF-0 at a platform temperature of 87.8°C (b).…”
Section: Resultsmentioning
confidence: 99%
“…32,33 At the same time, the introduction of a large number of hollow structures lengthens the path of heat transfer, slowing down the rate of heat transfer, and improving the insulation performance of the material. [34][35][36][37] Figure 9(b) shows the picture and infrared heat distribution of the commercial expandable polystyrene foam (EPSF), PIF-8 and PIF-0 were placed at a stable platform temperature of 87.8°C. It is obvious that the PIF prepared showed better heat insulation performance compared to the EPSF, thus effectively avoiding heat loss to the environment.…”
In this work, hollow glass microspheres (HGM) were introduced into the polyimide matrix as an effective reinforcement filler to improve the mechanical and thermal insulation properties of the polyimide foams (PIF). The HGM was surface-modified with the silane coupling agent to enhance the interfacial compatibility with PIF. Experimental results revealed that the average cellular diameter of PIF decreased obviously with the addition of the modified HGM (M-HGM). The apparent density of foams also increased from 15.85 to 18.34 kg/m3 when the M-HGM combination was changed from 0 to 12 percent (wt.%). Compared with the pure PIF, the composite foams added 8 wt.% M-HGM showed high compression strength (65 kPa) and compression modulus (1147 kPa), resulting in a distinct enhancement in mechanical properties. Furthermore, the addition of M-HGM filler also improved the thermal insulation performance of PIF, which exhibited the minimum thermal conductivity of 29.48 mW·m−1·K−1 with 8 wt.% M-HGM. Thus, considering the improved mechanical and insulation properties of the prepared PIF, it could be a promising candidate for the high temperature-resistant thermal insulating applications.
“…32,33 At the same time, the introduction of a large number of hollow structures lengthens the path of heat transfer, slowing down the rate of heat transfer, and improving the insulation performance of the material. 34–37 Figure 9.Thermal conductivity of PIF with different M-HGM contents (a). Picture and infrared images of EPSF, PIF-8, and PIF-0 at a platform temperature of 87.8°C (b).…”
Section: Resultsmentioning
confidence: 99%
“…32,33 At the same time, the introduction of a large number of hollow structures lengthens the path of heat transfer, slowing down the rate of heat transfer, and improving the insulation performance of the material. [34][35][36][37] Figure 9(b) shows the picture and infrared heat distribution of the commercial expandable polystyrene foam (EPSF), PIF-8 and PIF-0 were placed at a stable platform temperature of 87.8°C. It is obvious that the PIF prepared showed better heat insulation performance compared to the EPSF, thus effectively avoiding heat loss to the environment.…”
In this work, hollow glass microspheres (HGM) were introduced into the polyimide matrix as an effective reinforcement filler to improve the mechanical and thermal insulation properties of the polyimide foams (PIF). The HGM was surface-modified with the silane coupling agent to enhance the interfacial compatibility with PIF. Experimental results revealed that the average cellular diameter of PIF decreased obviously with the addition of the modified HGM (M-HGM). The apparent density of foams also increased from 15.85 to 18.34 kg/m3 when the M-HGM combination was changed from 0 to 12 percent (wt.%). Compared with the pure PIF, the composite foams added 8 wt.% M-HGM showed high compression strength (65 kPa) and compression modulus (1147 kPa), resulting in a distinct enhancement in mechanical properties. Furthermore, the addition of M-HGM filler also improved the thermal insulation performance of PIF, which exhibited the minimum thermal conductivity of 29.48 mW·m−1·K−1 with 8 wt.% M-HGM. Thus, considering the improved mechanical and insulation properties of the prepared PIF, it could be a promising candidate for the high temperature-resistant thermal insulating applications.
“…Петрихиной, Е.И. Бородина, а также в работах [9][10][11][12][13] зарубежных исследователей доказана принципиальная возможность получения искусственных пористых заполнителей из кремниевых пород.…”
Section: Introductionunclassified
“…Тепломеханические свойства композитов широко исследованы путем экспериментальных исследований [9][10][11][12][13]. Исследовалась зависимость теплопроводности от таких параметров композитных материалов, как средний диаметр микросфер, их содержание и распределение по объему композита.…”
THE PURPOSE. One of the directions of energy saving and energy efficiency improvement is the reduction of consumption of fuel and energy resources. A large amount of thermal energy is spent on heating buildings and structures during the heating season. To reduce heat losses through the building envelope, various heat-insulating materials with low thermal conductivity are used. The purpose of this research was to study the problem of developing the technology of lightweight concrete based on diatomite rocks, as well as uneven inclusions of filler from microspherical granules arising during its creation, assessing the effect of the presence of zones not occupied by microgranules on the insulating properties of the composite material, as well as determining the effect of the volume content of microspherical granules on the value of thermal conductivity.METHODS. In this work, we studied the production of lightweight structural concrete with porous aggregate synthesized from diatomite rocks of the Vladimir region, as well as the effect of the presence of zones not occupied by microgranules on the insulating properties of the composite material. RESULTS. The results showed that the distribution of microgranules in the matrix has a significant effect on the insulating properties of the composite, and the presence of voids in the material contributes to heat losses and a decrease in the thermal resistance of the material.CONCLUSION. The technology for obtaining the developed concrete does not differ from the technology for the production of high-class concrete, which allows the use of widely used concrete equipment.
“…1–5 These prominent merits have laid a solid foundation for its widespread applications ranging from aerospace, marine, and automotive industry to construction fields. 6–8 Driven by the necessity of sustainability and environmental preservation, continuous efforts are put into the cyclic utilization of staple wastes to fabricate functional substitutions, which may act as solutions in some environmentally hazardous applications. Simultaneously, stimulated by the quest of material economy and energy conservation, a feasible technical route is to advance the designability to make full use of relevant stuff, which in turn put forward objective demands of improving the property predictability of corresponding constituents.…”
To meet the evolving requirements of material designability, sustainability, and eco-friendliness, the development of syntactic foams puts great emphasis on filler optimization and matrix selection. Here, we present a novel...
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