01694nas a2200169   4500008004100000022001400041245010300055210006900158260012500227300001100352490000800363520094400371100003101315700002101346700002701367856013001394       2007                        eng d  a0021-960600aPathway to copolymer collapse in dilute solution: uniform versus random distribution of comonomers0 aPathway to copolymer collapse in dilute solution uniform versus   aCIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USAbAMER INST PHYSICScDEC  a2349010 v1273 a<p>Monte Carlo simulations show that copolymers with uniformly (or periodically) distributed sticky comonomers collapse ``cooperatively,'' abruptly forming a compact intermediate comprising a monomer shell surrounding a core of the aggregated comonomers. In comparison, random copolymers collapse through a relatively less-compact intermediate comprising a comonomer core surrounded by a fluffy monomer shell that densifies over a wide temperature range. This difference between the collapse pathways for random and uniform copolymers persists to higher chain lengths, where uniform copolymers tend to form multiple comonomer cores. In this paper, we describe the formation of such an intermediate state, and the subsequent collapse, by recognizing that these arise from the expected balance between comonomer aggregation enthalpy and loop formation entropy dictated by the chain microstructure. (c) 2007 American Institute of Physics.</p>1 aDasmahapatra, Ashok, Kumar1 aNanavati, Hemant1 aKumaraswamy, Guruswamy  uhttps://library.ncl.res.in/content/pathway-copolymer-collapse-dilute-solution-uniform-versus-random-distribution-comonomers-0