Modification of Wood with Monoethanolamino-borate by The Data of X-Ray Photoelectron Spectroscopy

Степина, Ирина; Kotlyarova, Irina

doi:10.1051/matecconf/201819604005

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…In this context, the studies conducted at NRU MGSU on the modification of cellulose fibers are of interest. Studies investigating the possibilities of modifying the properties of cellulose fibers used as a basis for a group of heat-insulating materials and as a reinforcing component for construction products have shown the feasibility of using borates and their derivatives [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Modified Polyethylene Foam for Critical Environments

Ter-Zakaryan¹,

Zhukov

Bessonov

et al. 2022

Polymers

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One of the most important priorities for all countries with property beyond the Arctic Circle and territories located in permafrost areas is the development of special construction technologies and systems. The required conditions are met by insulation systems based on seamless insulation shells made of polyethylene foam. The study of the strength and performance properties of polyethylene foam and its combinability was carried out according to standard methods and using the methods of experimental design and the analytical processing of the results. The change in material properties at negative temperatures was determined based on the results of climatic tests, followed by an evaluation of creep under load. The evaluation of the effectiveness of the design solutions was carried out using special computer programs. It was found that the performance characteristics of products made of polyethylene foam (rolls, mats) meet the requirements for insulation materials used at temperatures down to −60 °C. The resulting material is moderately combustible, which must be taken into account when developing recommendations for its use in insulation systems. A nomogram has been developed that makes it possible to predict the properties of a material and solve formulation problems. Insulation systems were developed, and a visualisation of the thermal fields of the insulation systems of the external walls and ceilings of a building was carried out.

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Section: Introductionmentioning

confidence: 99%

Modified Polyethylene Foam for Critical Environments

Ter-Zakaryan¹,

Zhukov

Bessonov

et al. 2022

Polymers

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“…The development of measures aimed at reducing the fire hazard of constructions with application of foamed polymers, including reduction in combustibility of these materials, refers to the priority area of fundamental and applied research. As a result of the studies, two complementary directions have been developed: the injection of fire retardants (usually mineral powders) into the polymer composition and the application of chemicals that chemically react with the base material in order to obtain substances of reduced combustibility [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Foam Polymers in Multifunctional Insulating Coatings

Ter-Zakaryan

Zhukov

et al. 2021

Polymers

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The application of foamed polymers as one of the components of insulating coatings allows to solve the problems of energy saving and creation of optimal operating conditions for constructions. The systems of application of energy-efficient heat-insulating materials must consider both the particularities of the insulating materials and the functional orientation of the constructions. The implementation of the concept of seamless insulating coatings implies the achievement of thermal effect and reduction in air permeability both by means of the application of thermal insulation with low thermal conductivity and the minimization of junctions between separate elements of the insulating coating, which is achieved using elastic foamed polymers and, first of all, polyethylene foam. Construction of seamless insulating coatings creates practically impermeable heat, vapor, and water barriers along the outer perimeter of the insulated object. Multilayer products based on polyethylene foam represent a relatively new material—a fact that requires examination of their properties, as well as under various operating conditions, and development of a methodology for evaluation of the operational resistance of these materials in structures of different purposes, including cold conservation. The performed tests have shown that the compressive strength at 10% deformation is determined by the function of load application area and varies from 70 kPa during the test of cube samples of 10 × 10 × 10 in size to 260 kPa for areas exceeding 100 m2. The longitudinal tensile strength amounts to 80–92 kPa, and the strength of the weld seam is equal to 29–32 kPa. It has been established that the values of thermal conductivity of polyethylene foam with an average density of 18–20 kg/m3 amounts to 0.032–0.034 W/(m·K), diffusion moisture absorption is equal to 0.44 kg/m2 without a metallized coating and 0.37 kg/m2 with a metallized coating; water absorption after partial immersion in water for 24 h amounts to 0.013 kg/m2; water absorption by volume after complete water immersion for 28 days is equal to 0.96%. The material does not practically change its properties under conditions of long-term temperature alteration from −60 to +70 °C. The developed and implemented insulation systems for protective surfaces of framed construction objects, rubbhalls and frameless structures, floating floors, indoor ice rinks, and snow conservation systems are presented.

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Room‐Temperature Green Recyclable Epoxy Composites with Enhanced Mechanical and Thermal Properties Cross‐Linked via B−O−C Bonds

Zhou

Fang

et al. 2022

ChemistrySelect

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Without any catalyst, a novel way for the preparation of epoxy (EDSPs) and their composites by cross-link via dynamic BÀ OÀ C bonds was presented. The EDSPs with a glass transition temperature (T g ) of 194 °C were resistant to various solvents and can be green degraded in ethanol at room temperature. The dynamic properties of EDSPs also give the composites excellent recyclability, as the expensive carbon and glass fibers can be recovered intact from the composites under mild conditions at room temperature. Mechanical performance tests showed that the carbon fiber composites (CF/EDSPs) can achieve a flexural strength of 849 MPa and an interlaminar shear strength of 58 MPa. Even after recycling and re-preparation, 99 % of the original flexural strength and 93 % of the original interlaminar shear strength are still maintained. Scratch repair experiments shown that scratch self-healing can be achieved in only 10 s at 200 °C.

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Modification of Wood with Monoethanolamino-borate by The Data of X-Ray Photoelectron Spectroscopy

Cited by 4 publications

References 7 publications

Modified Polyethylene Foam for Critical Environments

Modified Polyethylene Foam for Critical Environments

Foam Polymers in Multifunctional Insulating Coatings

Room‐Temperature Green Recyclable Epoxy Composites with Enhanced Mechanical and Thermal Properties Cross‐Linked via B−O−C Bonds

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