Polymer , generally curing time

Silicone adhesives are generally applied in a liquid and uncured state. It is therefore the physical and chemical properties of the polymers, or more precisely of the polymer formulation, that guide the various processes leading to the formation of the cured silicone network. The choice of the cure system can be guided by a variety of parameters that includes cure time and temperature, rheological properties in relation with the application process, substrates, the environment the adhesive joints will be subjected to and its subsequent durability, and of course, cost. 

In addition, cure time is increased five minutes for every 0.25 inches of thickness of a molding [6, 7]. In general, these rules do not apply to most polymeric systems because the phenomena of heat transfer and cure kinetics have been over-simplified. The cure rate depends on the basic polymers, curatives, cure temperature, and filler loading. The prediction of cure rate will be discussed from a new model of cure kinetics which is developed from the concept of a non-equilibrium thermodynamic fluctuation theory of chemical relaxation. 

In a multicomponent system such as a structural adhesive, the polymer component into which the nanoparticles are introduced does not generally cause a noticeable difference in the final morphology (Hackman and Hollaway 2006 Brooker et al. 2008). However, the morphology may be dependent on the cure time and temperature plus the temperature, time, and shear rate used for mixing. 

The flnal IR spectrum observed by a user for any sample (organic molecule or polymer) consists of a series of scans. An IR spectrum is composed generally of at least 20 scans. However, the combination of multiple scans with FT-IR provides a powerful real-time (RT) method for monitoring chemical changes, such as an in situ polymerization reaction. The rate of UV curing and photopolymerization, for example, can be easily calculated by analyzing the quantitative appearance or disappearance of a specific absorption band. 

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