By Laurence W. McKeen
This publication is an replace to the 1st version compiled and released in 1990 through William Woishnis. much has replaced within the box on account that 1990 and much has no longer replaced. There are new plastic fabrics. there was an important turnover in possession of plastics generating businesses. there was loads of consolidation, which after all ability discontinued items. hence, this replace is way extra huge than the standard "next edition." it's been reorganized from a chemistry perspective. Plastics of comparable polymer forms are grouped into 9 chapters. each one of those chapters contains an creation with a short clarification of the chemistry of the polymers utilized in the plastics. an in depth first bankruptcy has been further as an advent that summarizes the chemistry of constructing polymers, the formula of plastics, trying out and try out equipment, and plastic choice. most moldable items and elements are anticipated for use in environments except room temperature and traditional humidity stipulations. Chapters 2-10 are a databank that serves as an evaluate of plastics as they're uncovered to various working stipulations at varied temperatures, humidity, and different elements. Over 900 graphs for greater than forty five commonplace households of plastics are contained in those chapters. bankruptcy eleven comprises large mechanical and electric facts in tabular shape. The tables include information on a number of thousand plastics. equally, bankruptcy 12 includes thermal information on numerous thousand plastics. information from the 1st version have in basic terms been got rid of if these items have been discontinued, and plenty of items have been. Product names and brands were up to date. . particular introductions of plastics houses, checking out strategies, and ideas of plastics layout. . the single "databook" on hand at the results of temperature and humidity stipulations on plastics and elastomers. . greater than 1,000 graphs and tables let for simple comparability among items. . Covers greater than 70 sorts of plastics, and summarizes the chemistry of every kind.
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Extra info for The effect of temperature and other factors on plastics and elastomers
23. The value of Tg depends on the heating or cooling rate of the calorimetry experiment. 20. Tg estimate from dynamic mechanical thermal analysis (DMTA) study. 21. Diagram of a DSC sample and reference cell. 22. Schematic of a DSC showing a Tg. 3 Volume Methods of Determining Tg The changes in conformation that occur above Tg require more volume; hence, plotting a graph of specific volume or thermal expansion coefficient vs. temperature will provide a value for Tg as shown in Fig. 24. 4 Electrical Methods of Determining Tg Dielectric Constant: If a varying electric field is applied to a polymeric material, any polar groups will align with the field.
Indd 33 12/11/2007 5:55:55 PM 34 The Effect of Temperature and Other Factors on Plastics and Elastomers Thermosets often perform well under high continuous loads. Reinforced thermoplastics, such as thermoplastic polyester, may also perform satisfactorily. (2) WILL THE PART HAVE TO WITHSTAND IMPACT? (a) Will the part be subjected to impact? (f) Will the material be submerged or wiped with solvents or other chemicals? If so, which ones? (g) Will the material be exposed to chemical or solvent vapors?
In practice, one is basically concerned with the rigidity of the product and this involves not only the modulus of the material but also the shape and size of the product. From the points of view of weight saving, economy of the material, and ease of processing, it is important to keep section thicknesses at a minimum required to achieve performance targets. Since flat or singly curved surfaces have a minimum rigidity the designer may wish to incorporate domed or other doubly curved surfaces or ribbing into the product in order to increase stiffness.
The effect of temperature and other factors on plastics and elastomers by Laurence W. McKeen