Peroxide thermal initiation resin systems

Thermally Initiated Resin Systems Employing Peroxides... [Pg.360]

The most widely used initiators for curing unsaturated resins are peroxide compounds, which form free radicals on thermal breakdown, or redox systems. Duration of the process, lifetime of ini-... [Pg.6]

Polyester resins can be cross-linked by a free-radical initiator, usually an organic peroxide. Free radicals may be formed by thermal decomposition of an initiator such as erf-butyl perbenzoate or benzoyl peroxide, by ultraviolet (UV) or visible light decomposition, or by chemical decomposition in ambient temperature applications utilizing activators such as dimethylaniline. Inhibitors such as hydroquinone consume free radicals initially and reaction does not proceed until the inhibitor system is completely consumed. After an induction period the free... [Pg.8499]

Apart from the fluoro monomers vinyl fluoride (VF), vinylidene fluoride (VF2), and tetrafluoroethylene (TFE), only chlorofluoroethylene has found commercial use as homopolymer. It is applied as thermoplastic resin based on its vapor-barrier properties, superior thermal stability (Tdec > 350 °C), and resistance to strong oxidizing agents [601]. Chlorofluoroethylene is homo- and copolymerized by free-radical-initiated polymerization in bulk [602], suspension, or aqueous emulsion using organic and water-soluble initiators [603,604] or ionizing radiation [605], and in solution [606]. For bulk polymerization, trichloroacetyl peroxide [607] and other fluorochloro peroxides [608,609] have been used as initiators. Redox initiator systems are described for the aqueous suspension polymerization [603,604]. The emulsion polymerization needs fluorocarbon and chlorofluorocarbon emulsifiers [610]. [Pg.218]