Plasticizer action mechanism

Steps 3 and 4, however, can be described as chemical plasticization since the rate at which these processes occur depends on the chemical properties of molecular polarity, molecular volume, and molecular weight. An overall mechanism of plasticizer action must give adequate explanations for this as weU as the physical plasticization steps. 

Corrosion is generally taken to be the waste of a metal by the action of corrosive agents. However, a wider definition is the degradation of a material through contact with its environment. Thus, corrosion can include non-metallic materials such as concrete and plastics and mechanisms such as cracking in addition to wastage (i.e. loss of material). This chapter is primarily concerned with metallic corrosion, through a variety of mechanisms. 

In Japan, to control greenhouse whitefly and cotton whitefly that infest vegetables and ornamentals in the greenhouse, a yellow plastic tape formulation containing pyriproxyfen was developed. The tape has been widely used as it can lower the population of whitefly for several months after installation, and the influence on natural enemies and pollinators is low, and so forth. The action mechanism in this system is that adults attracted by the yellow color touch the tape and take pyriproxyfen into the body. The hatching of oviposited eggs is strongly inhibited by ovicidal activity via adults [38, 39]. 

Spectral properties of plasticizers are useful in various studies, especially in helping to understand various aspects of the mechanism of plasticizer action. " Table 10.1 shows typical IR absorption peaks by representatives of major groups of plasticizers. 

The equation reflects on the molecular mechanism of plasticization, as there is a correlation between viscosity of a plasticized system and the plasticizing action of a plasticizer. The greater is ATg, the greater is P (T) and the lower the viscosity. 

The special attention is given to the mechanism of plasticizers action in segmented polyrrrethanes and perspectives of plasticizers application for regulating properties of polyrrrethane compositions. 

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