exam 2 spring _09 - EMA 3066, Exam 2 February 26, 2009

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Unformatted text preview: EMA 3066, Exam 2 February 26, 2009 Name:______________________________ First Last I have neither given nor received help on this exam.___________________ Signature 1. Production of a nylon fiber requires spinning the fiber at a speed of 200 m/minute. If fiber is extruded through a hole 1 mm in diameter and the length of the hole is 5 cm, what is the pressure drop required (in units of atmospheres) across that hole? The viscosity for nylon under the processing conditions is 1400 poise. EMA 3066, Exam 2 February 26, 2009 2. Describe the synthesis of a styrene-butadiene diblock copolymer that contains a styrene block length of 500 repeat units and a butadiene block length of 100 repeat units. Include the steps of the synthesis and the concentrations of initiator and the monomers. EMA 3066, Exam 2 February 26, 2009 3. On the desks are envelopes containing a polymer sample (all the envelopes have the same polymer). Examine this sample and determine the following: Is the polymer crystalline or amorphous? If crystalline, provide an estimate for the Is the polymer crystalline or amorphous?...
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exam 2 spring _09 - EMA 3066, Exam 2 February 26, 2009

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