Question

1. Which of the following apply to nylon?  One or more answers are correct and you will receive negative points for incorrect answers.

		A compound with two carboxylic acid groups is reacted with a compound with two amine groups.
		The product forms as a fiber between two immiscible liquid layers.
		The product of the reaction is a solid collected by vacuum filtration.
		A free radical is used to get styrene molecules to bind to each other. 2. Which of the following would be a reasonable test for fracture?  Choose the best answer. Stretch polymer and release. Monitor whether polymer returns to original shape. Hit polymer with hammer and observe whether it breaks into pieces. Heat polymer and watch for changes such as swelling, color change, and change in hardness. Scrape polymer with spatula and observe whether there is permanent scratching of polymer surface. 3. Which of the following would be a reasonable test for elastic deformation?  Choose the best answer. Hit polymer with hammer and observe whether it breaks into pieces. Heat polymer and watch for changes such as swelling, color change, and change in hardness. Stretch polymer and release. Monitor whether polymer returns to original shape. Scrape polymer with spatula and observe whether there is permanent scratching of polymer surface.

Answer 1

1. Answers:

A compound with two carboxylic acid groups is reacted with a compound with two amine groups.

and

The product forms as a fiber between two immiscible liquid layers.

Reason: Nylon-6,6 prepared in an organic phase (cyclohexane) and an aqueous phase (water). The polymerization reaction occur at the interface of the aqueous and organic layers these two layers are immiscible. The product is a polymerizaed condensation polymer also named a s fiber.

The chemical reaction can be written as

n HOOC-(CH₂)₄-COOH + n H₂N-(CH₂)₆-NH₂ → [-OC-( CH₂)₄-CO-NH-(CH₂)₆-NH-]_n + (2n-1) H₂O

      adipic acid             hexamethylene diammine         nylon polymer

      (water soluble)         (organic phase soluble)

2. Answer: Hit polymer with hammer and observe whether it breaks into pieces.

Reason: Fracture always refers to broken things like bone fracture in medicine.

3. Answer: Stretch polymer and release. Monitor whether polymer returns to original shape.

Reason: Elasticity always refer to stretch and release to get original shape and size only.

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