M-M-M-M* Etc. Since it is experimentally found that the rates of addition of the various monomers to the growing free radical chain are similar, it is customary to treat the entire propagation sequence as follows. ] The "2" is added to recognize the fact that two growing chains are involved and are destroyed each time termination occurs. E. Carraher, Jr, The rate of monomer use can be described as Rate = k, [Mq[M] + ki [R][M] (11) where k, is the specific rate constant for the monomer-consuming initiation step.
The line dividing technology and science is often non-existent, though technology almost always follows science. The term "scientific method" is actually one that both scientists and each of us use everyday. As we bake cookies, we may vary the ratios and actual ingredients-testing (eating) the cookies and then drawing conclusion-and the next time using those changes we felt made a "better" cookie and laying aside those changes that were not positive. This is the process of inquiry, observation, testing, etc.
They may also serve as energy collective devices and burglar alarm systems. In contrast to coatings that must adhere to only one surface, adhesives are used to join two surfaces together (Table 4). Adhesion for both adhesives and coatings can occur through a number of mechanisms including physical interlocking, chemical adhesion Introduction to Polymer Science and Technology 35 where primary bonding occurs between the adhesive and the surfaces being joined, secondary bonding where hydrogen bonding or polar bonding occurs and viscosity adhesion where movement is restricted because of the viscous nature of the adhesive material.