The Results of the Study of the Influence of the Heat Flow of the Fire Source on the Thermal Insulation Layer of Combustible Material in the Facade System with an External Plaster Layer

В статье представлены результаты исследования по оценке влияния теплового потока очага пожара на теплоизоляционный слой из горючего материала в составе фасадной системы с наружным штукатурным слоем в период эксплуатации и установлении факта наличия или отсутствия скрытого ущерба от воздействия теплового потока при различной толщине наружного штукатурного слоя.The article presents the results of a study to assess the effect of the heat flow of the fire source on the thermal insulation layer of combustible material in the facade system with an external plaster layer during operation and to establish the fact of the presence or absence of hidden damage from the heat flow at different thicknesses of the external plaster layer

Molecular Catch Bonds and the Anti-Hammond Effect in Polymer Mechanochemistry

While the field of polymer mechanochemistry has traditionally focused on the use of mechanical forces to accelerate chemical processes, theoretical considerations predict an underexplored alternative: the suppression of reactivity through mechanical perturbation. Here, we use electronic structure calculations to analyze the mechanical reactivity of six mechanophores, or chemical functionalities that respond to mechanical stress in a controlled manner. Our computational results indicate that appropriately directed tensile forces could attenuate (as opposed to facilitate) mechanochemical phenomena. Accompanying experimental studies supported the theoretical predictions and demonstrated that relatively simple computational models may be used to design new classes of mechanically responsive materials. In addition, our computational studies and theoretical considerations revealed the prevalence of the anti-Hammond (as opposed to Hammond) effect (i.e., the increased structural dissimilarity between the reactant and transition state upon lowering of the reaction barrier) in the mechanical activation of polyatomic molecules