Question

reaction mech: initiation , propagation, and termination of the synthesis of polystyrene

Polymersti 2. Write the reaction mechanism (showing arrows) of the synthesis of polystyrene. 4pts • Include and show arrows in 2 initiation steps with benzoyl peroxide forming the phenyl radical. (this is shown in Figure 9 of the lab- just add all arrows) A propagation step of the styrene (the monomer) and phenyl radical. A second propagation step showing polymer growth by reacting styrene and the radical product of first propagation step. A termination step that does not include any initiating compounds. e Initiation lin initiation 2. che → Propagation: heat 20o . + CO2

Answer 1

The synthesis of ploystyrene:-

Full Mechanism. Formation of radical initiator; - 0 Benzoyl peroxide Ben Benzoyloxy radical bet say it as R Polymerisaban of Styrene • Initiation :- onan Ŕt th= cth - RCICH С. Н. Cotts Propagation :- Reth China 21 tah= CH cottis son + cth = cth R CH CH - Ch CHO I CGHS CGHT - Geths C6H5 ete. Rery CH-CH3 CH -cth an Gots Gotts Cots

• Termination: - QR - RR .MK RCH, CHIR - RCACH-R CoHo made, sering er de Also - QRCH CH C6H RCA CH - CH CHR Cotts Cotts t M Rf Cthach tch-cych CC Styrene Polystyrene This whole mechanism involves :- The formation of radicals followed by the reaction of radicals with a styrene monomer. Polymer chain is formed by progressive additias of monomers and last step is the termination, in which the growing active contre stops by coupling with other altive sites (radicals).