01857nas a2200229   4500008004100000022001400041245011600055210006900171260008600240300001300326490000700339520098100346653002101327653001601348653003001364653001601394653002101410653002101431100002401452700002301476856012801499       2011                        eng d  a0022-234800aEffect of composition on chain dimensions of styrene-methylmethacrylate random copolymers under theta condition0 aEffect of composition on chain dimensions of styrenemethylmethac  a325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USAbTAYLOR & FRANCIS INCcAPR  a996-10050 v503 a<p>Rotational-isomeric-state (RIS)-Metropolis Monte Carlo simulations are performed on poly(styrene-ran-methylmethacrylate) random copolymers to study the intrinsic unperturbed (theta-condition) dimensions. Mean-squared end-to-end distance (&lt; r(2)&gt;(o)), mean-squared radius of gyration (&lt; s(2)&gt;(o)), and characteristic ratio (C(n)) have been calculated for these copolymers constituted by different overall chemical compositions (styrene fractions 0.29, 0.56, and 0.70). Calculations were carried out with chains of 500 repeating units. With an increase in the styrene content there is an increase in (&lt; r(2)&gt;(o)), `, and C(n), in agreement with experimental observations. An increase in the fraction of trans conformational states in the backbone torsion angles is found to be responsible for the exhibited chain expansion behavior. The dimensions calculated by the Monte Carlo simulations agree well with experimental values reported in the literature.</p>10achain dimensions10aMonte Carlo10apoly(methyl methacrylate)10aPolystyrene10arandom copolymer10atheta conditions1 aKaryappa, Rahul, B.1 aNatarajan, Upendra  uhttps://library.ncl.res.in/content/effect-composition-chain-dimensions-styrene-methylmethacrylate-random-copolymers-under-0