will decrease, however, at all concentrations. In addition to a crossover concentration, a crossover temperature exists. Below the crossover temperature the plasticizer will also increase the modulus.

Selection

Over the last 60 years more than 30,000 different substances have been evaluated for their suitability as polymer plasticizers. Of these, only a small number - approximately 50 - are today in commercial use.

Ester plasticizers are selected based upon cost-performance evaluation. The

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