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Unformatted text preview: modulus if the matrix young’s modulus is 10 MPa and the fiber young’s modulus is 200 MPa? o. 12 MPa p. 29 GPa q. 29 MPa r. 12 GPa s. none of the above List 3 purposes of covalently modifying a protein drug with poly(ethylene glycol) PEG and list 1 drawback. (4pts) Consider resorbable calcium phosphate/HA ceramics: List 2 factors that can be used to increase resorbtion rate (and how can you modify that factor to increase the rate). (4pts) If a polymer sample with the fractions shown in the table below is crosslinked so that M c is 5,000 g/mol and the specific volume is 1.0 then what is the crosslink density and the effective number of crosslinks per chain? What is the polydispersity of the sample before crosslinking? (10pts) Number fraction Molecular weight g/mol 0.2 10,000 0.4 30,000 0.2 50,000 0.2 100,000...
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- Spring '06
- 4pts, Cross-link, 4 grains, 5,000 g