Download Chemical Resistance of Thermoplastics by William Woishnis, Sina Ebnesajjad (Eds.) PDF

By William Woishnis, Sina Ebnesajjad (Eds.)

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It would seem that the explanation is that a form of hydrogen bonding occurs between the polycarbonate and methylene chloride and between PVC and tetrahydrofuran. 24 As a result, the following broad generalizations may be made. xlii Effect of Chemicals on Plastics and Elastomers 1. Proton donors include highly halogenated compounds such as chloroform and pentachlorethane; less halogenated materials are weaker donors. 2. Polar acceptors include, in roughly descending order of strength, amines, ethers, ketones, aldehydes, and esters, with aromatic materials usually being more powerful than aliphatic ones.

In some cases they are the considered opinion of experienced compounders. The Los Angeles Rubber Group cannot guarantee their accuracy nor assume responsibility for their use. Several factors must always be considered when using a rubber part in service. The most important factors are: a. The temperature of service. Higher temperatures increase the effect of all chemicals on polymers. The increase varies with the polymer and the chemical. A compound quite suitable at room temperature might fail miserably at elevated temperatures.

Org) for the D543 test method. Significance and Use The choice of types and concentrations of reagents, duration of immersion or stress, or both, temperature of the test, and properties to be reported is necessarily arbitrary. The specification of these conditions provides a basis for standardization and serves as a guide to investigators wishing to compare the relative resistance of various plastics to typical chemical reagents. Correlation of test results with the actual performance or serviceability of plastics is necessarily dependent upon the similarity between the testing and the end-use conditions.

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