2.9: Radical Polymerization - Chemistry LibreTexts
2021年9月12日 · There are a number of very reliable methods of carrying out radical polymerization, leading to high molecular weight materials. A typical example is the formation of polystyrene under the influence of the radical initiator, azoisobutyronitrile (AIBN). Radical reactions start with an initiation reaction, in which radicals first come into being.
Styrene monomer will react with a variety of other monomers to form a number of copolymers. Polystyrene is an odorless, tasteless, rigid thermoplastic. Pure polystyrene has the following structure. The homopolymers of styrene are also referred to …
Polystyrene production by radical polymerization
2024年4月22日 · Polystyrene is a polymer that can be prepared by a monomer addition process. The addition reaction is catalyzed by radicals, anions or cations, although the most common processes are radical ones. In this experiment a radical process with benzoyl peroxide as …
polystyrene-based materials. Polymerization of Styrene Addition Polymerization. Generally, addition polymerization (nonliving system) involves four reaction processes: initiation, propagation, termination, and chain transfer. Figure 2a shows typical reaction processes in free radical polymerization: (1) initiation, formation of active radical ...
Polystyrene (PSt) - SpringerLink
2014年1月1日 · Via the in-situ polymerization, polystyrene is efficiently grafted on the rubber surfaces and placed as crosslinking units within the rubber particles, in which polystyrene radicals add to olefins of rubber chains and the resulting radicals further react with polystyrene radicals (coupling, graft-onto) or styrene (polymerization, graft-from).
Polystyrene Polymer - an overview | ScienceDirect Topics
A polymerization process using a thermal or catalyzed reaction of styrene monomer is used to produce an amorphous polystyrene polymer. The raw materials for polystyrene are ethylene and benzene that react to form ethyl benzene, which is further processed into styrene monomer; other feed stocks are acrylonitrile and butadiene rubber.
A Case Study on Online Estimation of Polystyrene Formation …
2022年12月1日 · Use of developed models for model prediction of thermal runaway measures (T cr and t cr) in polystyrene polymerisation under adiabatic and non-adiabatic conditions. Use of efficient EKO in conjunction with model prediction to provide early estimates of all process variables that triggers polystyrene runaway reaction.
Basics of Polystyrene Production - Process and Reactions
2010年11月8日 · The reaction shown above has a heat of reaction of -121 KJ/mol (endothermic). Nearly 65% of all styrene is used to produce polystyrene. The overall reaction describing the styrene polymerization is:
Chemical kinetics on thermal decomposition of polystyrene was studied by integrating the non-isothermal differential and integral methods. For decomposition of polystyrene in environment with only nitrogen, a mass loss stage was found at 282.9oC to 398.2oC. The maximum mass-loss rate was at 372.4oC.
Polystyrene Chemistry Tutorial - AUS-e-TUTE
Polystyrene is produced in an addition polymerisation reaction from styrene monomers. The reaction is highly exothermic, the heat of reaction for the polymerisation is -121 kJ mol -1 (at 25 o C). By Le Chatelier's Principle, increasing the temperature at which the reaction occurs would favour the reactant, monomer, side of the equation.