<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Stretching Homopolymers"^^ . "Force-induced stretching of polymers is important in a variety of contexts. We have used theory and simulations to describe the response of homopolymers, with N monomers, to an external force (f ) in good and poor solvents. In good solvents and for sufficiently large N we show, in accord with scaling predictions, that the mean extension along the f axis 〈Z〉 ∼ f for small f and 〈Z〉 ∼ f 2/3 (the Pincus regime) for intermediate values of f. The theoretical predictions for 〈Z〉 as a function of f are in excellent agreement with simulations for N = 100 and 1600. However, even with N = 1600, the expected Pincus regime is not observed due to the breakdown of the assumptions in the blob picture for finite N. We predict the Pincus scaling in a good solvent will be observed for N ≳ 105. The force-dependent structure factors for a polymer in a poor solvent show that there is a hierarchy of structures, depending on the nature of the solvent. For a weakly hydrophobic polymer, various structures (ideal conformations, self-avoiding chains, globules, and rods) emerge on distinct length scales as f is varied. A strongly hydrophobic polymer remains globular as long as f is less than a critical value fc. Above fc, an abrupt first-order transition to a rodlike structure occurs. Our predictions can be tested using single molecule experiments. "^^ . "2007" . "40" . "20" . . "American Chemical Society"^^ . . . "Macromolecules"^^ . . . "00249297" . . . . . . . . . . . . . . . . . . . "Bae-Yeun"^^ . "Ha"^^ . "Bae-Yeun Ha"^^ . . "Ngo Minh"^^ . "Toan"^^ . "Ngo Minh Toan"^^ . . "Changbong"^^ . "Hyeon"^^ . "Changbong Hyeon"^^ . . "Greg"^^ . "Morrison"^^ . "Greg Morrison"^^ . . "D."^^ . "Thirumalai"^^ . "D. Thirumalai"^^ . . . . . "HTML Summary of #1814 \n\nStretching Homopolymers\n\n" . "text/html" . . . "QD Chemistry"@en . .