Thermal stability chemical bond strengths

Impact strength also increased if the adhesion between the polymer and fiber is increased [240, 249]. The most promising method of modification of fiber-filled compositions is by pre-treating the fibers or adding to the matrix of specific depressants or modifiers with the aim of creating a chemical bond at the interphase. This improves the composition service lifetime, strength and thermal stability [250],... 

The exceptional thermal and chemical stability of PTFE originate in the strength of its primary chemical bonds. The carbon-fluorine bond energy is the highest currently known among organic compounds [3, 4]. In addition, the fluorine atoms... 

The increase in stability resulting from resonance or electron delocalization is important in the discussion of a great variety of chemical questions. A partial list of topics should stress this point. Properties of dyes, ultraviolet absorption, bond strengths, thermal stabilities, free radical reactions, heats of reaction, and rates of chemical reactions in general may be influenced by resonance stabilization in the chemical species involved. 

In some cases, several of these processes occur simultaneously, depending on the sample size, the heating rate, the pyrolysis temperature, the environment, and the presence of any additives. Although polymer degradation schemes can be greatly altered by the presence of comonomers, side-chain substituents, and other chemical constituent factors, the ultimate thermal stability is determined by the relative strengths of the main-chain bonds. Many additives and comonomers employed as flame retardants are thermally labile and as a result the thermal stability of the polymer system is reduced. In order to reduce the observed effects of the flame-retardant additives on the thermal stability of the polymeric materials, more thermally stable and hence inherently flame-resistant polymers are of increasing interest. 

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