Quiz3_Winter2005_with_solutions - First name: _ Last name:...

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First name: ________________ Last name: ________________Student number:___________ Tutorial number and/or TA name: ________________ University of Toronto Faculty of Applied Science and Engineering MSE101H1S – Quiz #3 April 5, 2005 Examiners: T.W. Coyle, S.J. Thorpe Total marks for all questions: 40 Marks are not equal for all questions. 1.a) On the axes below, sketch curves representing the relative stress-strain behaviour of 6 each of the following polymers: i) A highly networked polymer, e.g. phenol-formaldehyde ii) A semi-crystalline linear polymer, e.g. polyethylene iii) An elastomer, e.g. natural rubber 4 b) Drawing is a process for increasing the tensile strength and modulus of thermoplastic polymers. Describe the changes in polymer structure which give rise to the increase in mechanical properties using words and, if desired, a sketch. Initially, deformation occurs by stretching and breaking of weak secondary bonds between polymer molecules. As deformation proceeds, polymer chains are straightened and become aligned in the direction of the applied stress. Further deformation requires the strong covalent bonds along the molecule’s backbone to be
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This note was uploaded on 06/08/2010 for the course MSE MSE101 taught by Professor Proframsayscott during the Fall '03 term at University of Toronto.

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Quiz3_Winter2005_with_solutions - First name: _ Last name:...

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