Organic peroxide is the source of free radicals in the following uses: Free radical polymerization and copolymerization initiator of ① vinyl and two monomer, ② curing agent of thermosetting resin, crosslinking agent of ③ elastomer and polyethylene.
The decomposition temperature of an organic peroxide at an effective rate largely determines its use. Other important factors are cost, solubility, and safety. Organic Peroxides The efficiency and the types of free radicals generated, the necessity of refrigerated storage and freight, and the compatibility with production systems may affect the product and the ability to be activated. Organic peroxide can control a certain velocity decomposition at high temperature or at room temperature to generate reactive free radicals.
All organic peroxides are thermally unstable and are decomposed faster with increasing temperature. The commonly used quantitative method for the reactivity of organic peroxides is to determine the half-life, Organic Peroxides which is the time it takes to decompose a certain amount of peroxide at a given temperature to half its initial volume. Now, the half-life data of the commercial organic peroxide can be obtained from the computer floppy disk. Organic Peroxides Use a Computer menu program to select the appropriate peroxide for an aggregation or process condition.
These free radicals can be added to unsaturated vinyl monomers such as: styrene, vinyl chloride or methyl methacrylate to induce polymerization. Some free radicals also attack polymers such as PE to generate free radicals on the chain. When two such polymer free radicals are bonded together, Organic Peroxides a cross-linked structure is formed.
At present, more than 50 different types of organic oxygen compounds, including pure substances and more than 100 different formulations, such as solvent dilution, Organic Peroxides paste and the variety contained in the filler.
Benzoic acid is the earliest and commonly used organic peroxide, a granular crystalline solid, heat and stability at ambient temperature. To improve safety, benzoic acid can be added to 22% or 30% (weight) of water as a wet product to reduce flammability and vibration sensitivity. In addition, there is a paste formulation of benzoic acid with concentrations in 25%~ 50%.
Organic peroxides are being actively developed. It is found that this kind of peroxide is an effective initiator for the synthesis of acrylic high solid coatings, which is of particular interest in the synthesis of compatibility agents for polymer blends and alloys. Organic peroxides containing groups of inhibitors such as hindered amines are another new development area. These peroxides provide a convenient way to obtain a light stabilizer for joining polymers, Organic Peroxides overcoming the problems of mobility, volatility and incompatibility.