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Ch.12 - Solids and Modern Materials
Chapter 12, Problem 93

If you want to make a polymer for plastic wrap, should you strive to make a polymer that has a high or low degree of crystallinity?

Verified step by step guidance
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Step 1: Understand the concept of crystallinity in polymers. Crystallinity refers to the degree of structural order in a polymer. A high degree of crystallinity means the polymer chains are well-organized and packed closely together, while a low degree of crystallinity means the chains are more disordered.
Step 2: Consider the properties of polymers with high crystallinity. These polymers tend to be more rigid, have higher melting points, and are less permeable to gases and moisture. This is due to the tight packing of the polymer chains.
Step 3: Consider the properties of polymers with low crystallinity. These polymers are generally more flexible, have lower melting points, and are more permeable to gases and moisture. The disordered arrangement of chains allows for more movement and flexibility.
Step 4: Relate these properties to the desired characteristics of plastic wrap. Plastic wrap should be flexible, able to stretch and conform to the shape of the items it covers, and provide a barrier to moisture and gases to preserve food.
Step 5: Conclude whether a high or low degree of crystallinity is more suitable for plastic wrap based on the desired properties. Consider that flexibility and barrier properties are key factors in determining the appropriate degree of crystallinity for this application.