Thermal Degradation of PMMA

Thermal Degradation of Polymethyl methacrylate M.Sc. Ümit TAYFUN CHEM 512 DEGRADATION AND STABILIZATION OF POLYMERS METU 2007

Poly(methyl methacrylate) ,[object Object],[object Object],[object Object]

Applications of PMMA ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Degradation ,[object Object],[object Object],[object Object],[object Object],[object Object]

Thermal Degradation ,[object Object],[object Object],[object Object],[object Object],[object Object]

Thermal Degradation ,[object Object],mainchain scission side group scission disappear depolymerization

Thermal Degradation of PMMA ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],PMMA Homolytic bond dissociation Tertiary alkyl radical Secondary alkyl radical fragmentation

Thermal Degradation of PMMA ,[object Object],[object Object],[object Object],The energy of activation for the fast reaction is much smaller than that of the slow reaction Degradation of isotactic and syndiotactic PMMA , which degrade by random initiation, have a first-order termination reaction

[object Object],[object Object],[object Object],[object Object]

Thermal Degradation of PMMA ,[object Object]

Thermal Degradation of PMMA ,[object Object],[object Object]

Thermal Degradation of PMMA ,[object Object],[object Object],This is the reverse of the propagation step in the polymerization process

Thermal Degradation of PMMA ,[object Object],[object Object],[object Object]

Thermal Stabilization of PMMA ,[object Object],[object Object],[object Object],[object Object],[object Object],Thermal stability of PMMA increases with adding;

References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Thermal Degradation of PMMA

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Thermal Degradation of PMMA