3. Specific polymer degradation and stabilization
As we discussed earlier, each polymer may encounter one or more particular modes of degradation, depending on its chemical nature or that of its additives, and the particular environment in which it finds itself during processing or service life. For each degradation mode, a more or less complex type of stabilization is possible.
Examples of thermal stabilizers are shown in figure 15 and photochemical stabilizers in figure 16 .
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Specific polymer degradation and stabilization
Conclusion
Bibliography
Websites
REACH info :
http://ec.europa.eu/environment/chemicals/reach/reach_intro. htm
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Events
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Standards and norms
ASTM D 1238-01 (DIN ISO 1133 : 1997) Plastics. Determination of melt flow index of plastics.
ASTM D 2115-92 (ISO 305 : 1990) Thermal degradation test in an oven. Color change method
ASTM D 1925-70 (DIN 6167) Color measurement test (yellow index)
ASTM D 2538-02 Study of rheology and degradation in a plastograph
ISO 175...
Directory
Main stabilizer suppliers
Arkema http://www.arkema.com
BASF AG. http://www.basf.com
Brueggemann http://www.brueggemann.com
Clariant...
Statistical and economic data
It is particularly difficult to get a clear picture of the market for stabilizers used in plastics, as the notion of stabilization can take on multiple definitions, and the market often considers additives (modifiers) as a whole, not just stabilizers. Of all polymers, PVC (polyvinyl chloride), which is not discussed here, is the one with the highest stabilizer volume [
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