section%209.5%20-%20Polymer%20Properties

Section 9.5 - 9.5 Polymer Properties Objectives Predict properties of polymers One of the differences between polymers and other materials is the

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9.5 Polymer Properties Objectives Predict properties of polymers. One of the differences between polymers and other materials is the range of properties that they can have. Most metals are somewhat similar to each other: moduli for metals are around 100-200 GPa, yield strengths are generally a few hundred MPa, and percent elongations are few tens percent. In constrast, polymers have a wide range of properties. Table 9.5.1 shows typical values for three different polymers. The biggest range is seen in the modulus, which can vary by 4 orders of magnitude! Table 9.5.1: Typical mechanical properties for polystyrene, low density polyethylene, and elastomers. Material Modulus (GPa) Yield Strength (MPa) Elongation (%) polystyrene 3 25-70 1-3 LDPE 0.2 10-15 100-500 elastomer 0.003 No yield 100-800 Polymer properties depend on the degree of crystallinity or crosslinking, and what the Tg and Tm of the polymer are. In order to predict the properties, we need to think about the state of matter for each phase that is present in the polymer. We will begin by looking at the stress-strain curves in Figure 9.5.1. This figure shows three curves that are typical for different types of polymers. First we will relate these curves
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This note was uploaded on 03/30/2010 for the course EMA 3010 taught by Professor Unknown during the Spring '08 term at University of Florida.

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Section 9.5 - 9.5 Polymer Properties Objectives Predict properties of polymers One of the differences between polymers and other materials is the

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