Preview

Bulk Polymerization of Styrene with AIBN

Satisfactory Essays
Open Document
Open Document
337 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Bulk Polymerization of Styrene with AIBN
Polymer Chemistry 2011

Bulk polymerization of styrene with AIBN Step one: Preparation of the monomer. Remove inhibitors from styrene by passing it through a mini-column packed with basic alumina: place a small glass wool plug in the bottom of a Pasteur pipette and fill it one-half full with alumina. Place the mini-column in a hood and add styrene drop wise to the top of pipette. It takes about 4 minutes to elute 2 mL of styrene. If it takes much longer than 4 minutes, the styrene may be contaminated with some polymeric material and very little monomeric styrene will be collected in a reasonable amount of time. A new bottle of styrene should be substituted.

Step two. Polymerization of the monomer. 1. Weigh 2.5 g of freshly eluted styrene and 40 mg of the initiator, AIBN, in a 10 x 75 mm test tube 2. Cover the test tube with a rubber septum. 3. Place the test tube in a oil bath (60 ºC) and record time. 4. Remove the test tube from the oil bath after 45 minutes. 5. Pour the reaction mixture immediately after removal from the oil bath, into beakers containing 50 mL stirred methanol. A white precipitate should settle out. If the product is difficult to pour, add a small amount of toluene (2 mL) to dissolve it and then pour into methanol. 6. Continue to stir in methanol for another 10-20 minutes. 7. Vacuum filter the solid polymer and wash with methanol several times. 8. Air-dry the polymer or dry the polymer in a vacuum oven at room temperature until constant weight. Step three: Analysis of the polymer. Calculate the % yield of polymer. Record NMR of the sample, and run a differential scanning calorimetry to determine Tg. Questions/tasks: 1) Make a risk assessment. 2) Wright polymerization reaction scheme, identify the repeating unit 3) Wright detailed mechanism (initiation, propagation, termination) 4) Explain how the amount of initiator should affect the molecular weight of the polymer?

You May Also Find These Documents Helpful

  • Satisfactory Essays

    "The procedure for this experiment appears on page 14-17 of the Lab manual. To help write this lab report I used the organic chemistry lab manual pages 10-17.…

    • 479 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    This experiment follows the instructions as found on page 44 of the Operational Organic Chemistry textbook with no exceptions.…

    • 602 Words
    • 3 Pages
    Satisfactory Essays
  • Good Essays

    THE AP EURO DBQ

    • 555 Words
    • 2 Pages

    Read the procedures (“Getting Started” pp. S147-S148, “Procedure” pp. S148-149, and “Designing and Conducting Your Investigation” p. S150) in the lab handout carefully so that you know what you will be doing when you come to the laboratory. Answer the following questions:…

    • 555 Words
    • 2 Pages
    Good Essays
  • Satisfactory Essays

    biology unit 4

    • 341 Words
    • 2 Pages

    Water added to the polymer, unlinking the chain and breaking it back down to its original monomer units.…

    • 341 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Experiment 1 Procedures

    • 537 Words
    • 3 Pages

    Procedure: To a 125 mL Erlenmeyer flask containing a mixture of 95% ethanol (6 mL) and acetic acid (5 mL), dissolve acetanilide (7.4 mmol) and sodium bromide (1.8 g). Place the reaction flask in an ice bath (at least 5oC) for 5 minutes (keep this reaction in the hood). Add sodium hypochlorite (8.3 mmol) by addition of household bleach; leave the reaction flask in the ice bath 5 min. After removing the flask from the ice bath and placing a watch glass over the opening, allow the reaction mixture to come to room temperature over 15 minutes. Place the reaction flask into the ice bath and quench the unreacted bromine by addition of both 5 mL of sodium thiosulfate solution (1 g/5 mL) and 5 mL sodium hydroxide solution(1 g/5 mL ); collect the product by suction filtration. Recrystalllize the brominated product from a minimum amount of solvent. You will need to select a solvent from water, 50% ethanol or 95% ethanol. To identify the best solvent, use what you have learned in Organic I Chemistry Lab, hint: think about what properties makes a good recrystallization solvent. Test your recrystallization solvent in test tubes using the tip of a spatula of your compound. Remember to use a water bath to heat organic solvents. NEVER heat organic solvents directly on a hot plate-always use a hot water bath! Dry the product and obtain melting point range (one fast and one slow) and an IR spectrum. Be sure to record observations in your laboratory notebook.…

    • 537 Words
    • 3 Pages
    Satisfactory Essays
  • Good Essays

    Polyurethane Analysis

    • 666 Words
    • 3 Pages

    the polyaddition reaction, which is a special case of polycondensation, with the difference that the reaction product is exclusively the polymer. In the classical polycondensation reactions, the products are: the polycondensation polymer and a low molecular weight (MW) compound (water, alcohols, and so on). The fact that in the polyaddition reactions the product is only the polymer is of great technological importance, especially for the purity and the morphology of the resulting macromolecular…

    • 666 Words
    • 3 Pages
    Good Essays
  • Powerful Essays

    Procedure*Please refer to the lab handout 6 and Macroscale and Microscale Organic Experiments (Williamson, 2003).…

    • 1900 Words
    • 7 Pages
    Powerful Essays
  • Satisfactory Essays

    Polymer Chains

    • 600 Words
    • 3 Pages

    a. Identify and draw the chemical formula of the monomer from which this polymer is made of. Clearly explain the criteria you used to identify the monomer. State how many carbons, oxygens, and hydrogens can be found in one monomer of this polymer.…

    • 600 Words
    • 3 Pages
    Satisfactory Essays
  • Powerful Essays

    Spring Syllabus

    • 2332 Words
    • 10 Pages

    |College: Science and Technology |Required Text(s): The laboratory manual, Experiments In General Chemistry, 6th |…

    • 2332 Words
    • 10 Pages
    Powerful Essays
  • Powerful Essays

    Discuss this statement with reference to a polymer made from one of the above monomers.…

    • 1084 Words
    • 5 Pages
    Powerful Essays
  • Powerful Essays

    To keep it as simple as possible, (K.I.S.S.) this topic involves the study of: 1. POLYMERS FROM PETROCHEMICALS & BIOMASS…

    • 15670 Words
    • 63 Pages
    Powerful Essays
  • Good Essays

    c. What effect would you expect if ddCMP (shown in b) were added to the synthesis reaction in large excess over dCTP? At 10% the concentration of dCTP? Nothing will occur. As ddCMP acts as the chain terminator, the probability of getting ddCMP inside is fairly high due to the higher concentration. At 10% the concentration of dCTP, there will be an even smaller (very little) decrease in polymerization.…

    • 1309 Words
    • 6 Pages
    Good Essays
  • Satisfactory Essays

    The Outsiders Setting

    • 254 Words
    • 2 Pages

    Most people would not like to grow up in the 60s. Especially if they were a greaser in a bad town like the characters in S.E Hinton's book The Outsiders. The setting of the book is east/west side of town. There are two groups in town, the socs and the greasers. They were a greaser or soc depending on what side of town they lived in. For example the greases lived on the east side and the socs lived on the west side of town. They setting affects the characters by developing their personality based on where they lived.…

    • 254 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Biology

    • 2208 Words
    • 8 Pages

    How do you build a polymer? How do you breakdown a polymer? Build by dehydration from monomers and take out wather, break down by hydrolysis add water to form monomers…

    • 2208 Words
    • 8 Pages
    Good Essays
  • Satisfactory Essays

    In William Faulkner “A Rose for Emily’’ we think about who is Emily, what does the rose symbolizes, and most of all who is the narrator. Throughout most of Faulkner’s story for me as a reader I wanted to figure that out. In the beginning Emily is presented as a woman who grew up wealthy never having to worry about anything. But over time things changed after her father’s death. Later on, Emily never really takes notice of the present.…

    • 480 Words
    • 2 Pages
    Satisfactory Essays

Related Topics