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Homework 3 - A thermoset can be cross-linked branched or...

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PTFE 2200 Homework 3 Laura Hughey 1. A thermoplastic polymer is one that when heated, flows in the manner of a highly viscous liquid. This process is reversible in a thermoplastic polymer and can occur time and time again. A thermoset polymer is one in which once heated for a short time, can flow as a viscous liquid. In contrast to a thermoplastic, however, a thermoset cannot be reheated. A chemical cross-linking reaction occurs within that causes the liquid to solidify and form an infusible mass. The principal difference between the two is the manner of forming. 2. Thermoplastic: Ice, steel Thermoset: Concrete, egg 3. A thermoplastic can have either branched or linear molecular architecture.
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Unformatted text preview: A thermoset can be cross-linked, branched, or linear. Cotton is an example of a linear thermoset. 4. (a) The resin used to make composites is liquid. (b) A chemical process converts the liquid to a solid. (c) The molecular architecture of the polyester in the final product is cross-linked. 5. (a) PET is the polymer commonly used to make fibers. The resin begins as a pellet. (b) A physical property melts and extrudes the pellets so it can be stretched into a fiber. (c) The molecular architecture is linear in the final product. 6. No, though not referring to the same material (i.e. one is thermoset and one is thermoplastic), they are both in the class of polyesters....
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