Answer :
Above 220 °C, the polymerization process of Polymethyl Methacrylate (PMMA) would be expected to proceed rapidly and result in a high degree of polymerization. Below 220 °C, the polymerization process would be expected to proceed slowly or not at all.
Polymethyl Methacrylate (PMMA) is a thermoplastic polymer that can undergo free radical polymerization. In this polymerization process, monomers of methyl methacrylate (MMA) join together to form a polymer chain. The reaction is initiated by a radical initiator, which generates free radicals that initiate the polymerization.
At temperatures above 220 °C, the rate of the polymerization reaction increases significantly. The increased temperature provides more energy to break the bonds in the initiator and monomers, leading to a higher concentration of free radicals and more frequent collisions between monomers. This results in a rapid polymerization process, producing a high molecular weight polymer with a high degree of polymerization.
Conversely, at temperatures below 220 °C, the reaction rate slows down. Insufficient thermal energy hinders the bond-breaking process, leading to fewer free radicals and fewer collisions between monomers. As a result, the polymerization proceeds slowly or may not occur at all, resulting in a low or negligible degree of polymerization.
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