GCC CHM 107LL - CHM 107LL: Exploring Polymers (5 pages)

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CHM 107LL: Exploring Polymers



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CHM 107LL: Exploring Polymers

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Lecture Notes


Pages:
5
School:
Glendale Community College-AZ
Course:
Chm 107ll - Chemistry and Society Laboratory

Unformatted text preview:

CHM 107LL Exploring Polymers Background In this experiment you will synthesize three polymers linear polyester Glyptal polyester and nylon Your instructor will demonstrate the synthesis of polystyrene from the monomer styrene These are all polymers you use in your daily life Polymers are very large molecules that exist in chains composed of smaller repeating units called monomers Figure 1 shows polystyrene The n subscript in the figure represents a large number and signifies that the unit in brackets repeats that many times The n can be in the thousands or tens of thousands Remember that hydrocarbons are chemicals that contain only hydrogen and carbon atoms You will compare all four polymers in this lab Figure 1 Polystyrene Both linear and cross linked polymers will be prepared in this lab Linear polymers have the monomers repeated in just one line Cross linked polymers are branched Linear polymers have just two ends Cross linked have more than two ends Figure 2 shows the synthesis of linear polyester from phthalic anhydride and ethylene glycol Figure 2 Preparation of linear polyester If more than two functional groups reactive sites are present in the monomer the monomers may connect to each other by cross linking to form a branched three dimensional molecule instead of a linear molecule Such polymers are usually more rigid than the linear kind and are useful in making paints and coatings Glyptal is prepared using glycerol and is depicted in Figure 3 Figure 3 Structure of Glyptal Reaction of adipoyl chloride with a diamine leads to a linear polyamide by a condensation reaction depicted in Figure 4 A condensation reaction occurs when the monomers join together and release a small molecule as a byproduct For example let s say the monomer H X joins with a second monomer W OH to make the polymer XWXWXW What was left over The H and OH were left over and they make HOH or water as a byproduct Figure 4 Synthesis of nylon 6 6 Procedure Safety Many of the compounds in this



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