6.1 Polymers

These flashcards are designed to help students review key concepts related to polymer materials, properties, control charts, and manufacturing processes as covered in the lecture notes.

What are the two main categories of polymers?

Thermoplastic and Thermoset.

How do thermoplastics differ from thermosets?

Thermoplastics can be reheated and remolded, while thermosets chemically change when heated and cannot be remolded.

What is the meaning of Cpk > 1?

The process is capable of producing results within the specification limits.

What is the purpose of control charts in manufacturing?

To ensure the process is in control and capable of producing predictable results.

What do control limits in a control chart indicate?

They determine process stability and control.

Define 'amorphous' in terms of polymer structure.

A structure in which polymers are arranged randomly, leading to broad melting points and lower shrinkage.

What does the UL94 rating V-0 indicate?

The material stops burning within 10 seconds on a vertical specimen with no flaming drips.

What is the significance of a shrink rate in part design?

It affects part quality and dimensional tolerances.

List one advantage and one disadvantage of biodegradable plastics.

Advantage: They decompose due to microorganisms; Disadvantage: They can emit toxic gases during decomposition.

What effect do glass fibers have on the heat deflection temperature of a polymer?

They raise the heat deflection temperature.