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Melt processing, radical formation

Radiation chemistry in polymer research, 168-169 Reactive macroalkyl radicals, formation, 409 Reactive modifiers addition of reactive antioxidants on rubbers, 417 adhesion, 420,422 demanding applications, 414,416 improving additive performance during melt processing, 412 polymer bound antioxidant, 418-419/ Reduced poly(vinyl chloride),... [Pg.482]

Free-radical formation during melt processing... [Pg.128]

Effect of Temperature and Water. Thermal oxidation of plastics and rubbers can occur at all stages of their lifecycle but is most pronounced during melt processing. The combined effects of temperature (180-330°C) and shear lead to mechanical rupture of polymer chains and formation of reactive mechano-alkyl radical (R). The thermal history of a polymer, therefore, has major consequences on its subsequent in-service performance. Table 1 summarizes the factors affecting polymer degradation at different stages of its lifecycle. [Pg.7748]

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Formate radicals

MELT PROCESSING

Melt formation

Melt processability

Melt-processible

Process radical

Processing melting

Radical formation

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