MSE-BioE+118+2011+L_2-3+W

MSE-BioE+118+2011+L_2-3+W - MSE/BioE 118 Lectures #2 &...

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MSE/BioE 118 Lectures #2 & 3 Review of Materials Science and Engineering Polymer Science Temenoff & Mikos 2.4, 2.5.6, 3.5 Outline 1. Basic Structure of Polymers: Chemistry 2. Chain Configuration 3. Molecular Weight 4. Polymer Structure Primary Structure Secondary Structure 5. Polymerization 6. Types of Polymers Copolymers 7. Secondary Bonding in Polymers Interatomic and Intermolecular bond parameters 8. Microstructure 1. Basic Structure of polymers Chemistry What is a polymer? -[mer]- n -[ X ]- common chemistry as building block repeating unit of X X = C, H, N, O, S, Cl, F Si, metal ions, Fe, others synthetic or biopolymers n H | H | H | -[- C - C -]- Temenoff & Mikos, Ch. 2.4
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l : length of a single bond m: number of bonds Root-mean-square length 2. Chain ConFguration Temenoff & Mikos, Ch. 2.4 r R 2 0.5 = m 0.5 l -[ X ] n - n = degree of polymerization = DP Shackelford, Chapter 13 3. Molecular Weight 3. Molecular Weight Polymers do not have unique molecular weights like smaller organic molecules M n = polydispersity index ~ 1.1 to 3 Ratner 2.2
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3. Molecular Weight Low MW compounds M= W (mass)/N(moles) = g/mol = number average MW = = M n N i M i N i w i N i = W N i
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This note was uploaded on 01/21/2012 for the course C 118 taught by Professor Hayleylam during the Fall '11 term at University of California, Berkeley.

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MSE-BioE+118+2011+L_2-3+W - MSE/BioE 118 Lectures #2 &...

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