The First Attempts to Make Synthetic Polymers Involved

question 59

Multiple Choice

The first attempts to make synthetic polymers involved

• A)combining monomers of ethylene to form polyethylene.
• B)modifying a naturally occurring polymer to form celluloid.
• C)compression molding.
• D)the synthesis of polyamides.

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Definitions:

Sub-Frames

Structural components that provide support to the main frame of a vehicle, often used to isolate vibrations or add rigidity.

Upper Coupler

A component of a trailer's coupling device that connects the trailer to the fifth wheel of a tractor or towing vehicle, ensuring a secure connection.

AWS Welding Electrodes

Electrodes classified by the American Welding Society, designed for specific types of welding processes and materials.

Tempered Steel

Any heat-treated steel. For instance, most highway trucks use middle alloy, tempered steel frame rails with a yield strength of 110,000 psi. If this steel was to be annealed (that is, remove the temper by heating followed by gradual cooling), the frame yield strength would be less than 60,000 psi.