Relaxation properties of organo-mineral composites

21st International Scientific Conference on Advanced in Civil Engineering "Construction - The Formation of Living Environment"

土木建筑工程

Matseevich, Tatiana^1 ; Askadskii, Andrey^1,2

Moscow State University of Civil Engineering, Yaroslavskoe Sh. 26, Moscow

129337, Russia^1

A N Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences, Vavilova str. 28, Moscow, Russia^2

关键词: 2.4-toluendiisocyanate;    Chemical transformations;    Construction building;    Fine-grained structure;    High-quality materials;    Liquid sodium;    polyisocyanate;    Relaxation property;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/365/4/042010/pdf
DOI  :  10.1088/1757-899X/365/4/042010

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The relaxation properties of hybrid organic-mineral composite materials based on liquid sodium glass, 2.4-toluendiisocyanate and the polyisocyanate, modified epoxy resin have been investigated. The aim of this work is to produce building materials, combining the properties of organic polymers and inorganic materials. Obtaining such materials in one stage creates the preconditions for energy savings and obtaining high quality materials. Curing in the mild conditions at temperatures of 60-70°C leads to the formation of network structures of the polymers. Methods: To characterize the mechanical properties used method stress relaxation. For polymers, the relaxation properties are not less important than the ultimate mechanical properties (strength and deformability). At constant strain, the stress relaxes intensively, resulting in loss of mechanical efficiency of the material. Measurement of stress relaxation at various temperatures gave the opportunity of creating master curves of relaxation and prediction of mechanical behavior for a long time. To study the chemical structure of the produced materials we used the method of IR spectroscopy. The outcome of the following: Spectral studies and related calculations using the computer program «Cascade» (INEOS RAS) indicate the complex nature of the chemical transformations during thermal exposure in preparing monolithic samples. Modification of the initial mixtures with epoxy resin results in a more homogeneous fine-grained structure of the composites and improving their mechanical properties. The study of the process of stress relaxation at various temperatures in the range 20-100°C were provided and the physical parameters of the memory functions were found. The initial relaxation modulus reached values of 1000 MPA at 20°C, and 540 MPa at 100°C. For free of non-modified epoxide starting materials of the relaxation module was 730 MPa at 20°C and at 100°C to 520. The master curves were drawn to predict relaxation behavior for large durations of the course of process. The greatest relaxation module has material containing an increased amount of a polyisocyanate. Conclusions: the resulting structures can serve as the basis of decorating and construction building materials. They are easily painted in different color, have moderate stress relaxation and high relaxation modules.