STRESS STRAIN Typical for thermosets Typical for thermoplastics Q/Interpret the following drawing

What polymer derived from acetylene gas is called polychloroprene (neoprene)?

13.3 Given the following information, and the Instron curve below for an axial stress experiment conducted on a sample of polyisoprene at room temperature (25 °C): Engineering Yield Stress = 48 MPa Elastic Modulus = 40 MPa Elongation at break (e) = 2.25 Ultimate Stress = 50 MPa (note 1 MPa = 1MN/m²; MN = megaNewton) = 106 N/m² Initial Sample Length = 1.5 cm (= 0.015 m) Initial Sample Cross-Sectional Area = 0.34 cm² (= 3.4 * 105 m²) Glass Transition Temperature = look up using the macrogalleria, level 2. A. What force is applied as the polymer reaches its yield stress (in N)? B. What is the length of the polymer just before it breaks (in cm)? C. Draw a plausible stress-strain graph (preferably using software like Excel) that incorporates all of the data given above for this experiment. D. Draw a second curve (qualitatively, by hand) on top of the graph in part (C) to indicate what the Stress-strain curve would look like if the sample were tested at -90 °C instead of 25 °C. Note: glassy…

An unknown polymer sample was found to have the following molecular weight distribution: Molecular weight range 8,000 - 20,000 20,000 - 32,000 32,000 - 44,000 44,000 - 56,000 56,000 -68,000 68,000 -80,000 80,000 - 92,000 Having a DP=763, which of the following common polymers is this sample? Xi 0.05 0.15 0.21 0.28 0.18 0.10 0.03 Wi 0.02 0.08 0.17 0.29 0.23 0.16 0.05 Select one: O a. Polymethylmethacrylate with a monomer molecular weight of 100.121 g/mol O b. Polystyrene with a monomer molecular weight of 104.15 g/mol Polycarbonate with a monomer molecular weight of 61.0168 g/mol O c. O d. Polyvinyl chloride with a monomer molecular weight of 62.498 g/mol Polypropylene with a monomer molecular weight of 42.08 g/mol O e.