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The effect of processing on the initial stages of crystallization is not fully understood. Our study investigates the influence of pre-shear on monodisperse melts and bidisperse blends of a generic, segmentally coarse-grained polymer model. Through molecular dynamics simulations, we explore how polydispersity affects crystallization, where we found that the addition of short chains to a melt of longer chains increased the end-of-simulation crystallinity by about 10% and increased the initial growth rate by roughly a factor of two. In contrast, however, pre-shearing the hot melt before quenching only showed a minor increase in both growth rates and final crystallinity, except in monodisperse melts of short chains. Crystal grain shapes were most influenced by pre-shearing monodisperse melts, where both asphericity and prolateness decreased. In addition, we determined topological connectivity of crystal grains through tie- and loop-chain analysis. Again, only monodisperse melts showed a significant increase of tie chain fractions with pre-shear, while all other systems showed only modest increases. Our findings provide insight into the changes of crystallinity and cluster morphologies that emerge when pre-sheared, offering a deeper understanding of the initial crystallization processes in polymer melts when subjected to pre-shear.<\/jats:p>","DOI":"10.1063\/5.0338581","type":"journal-article","created":{"date-parts":[[2026,7,16]],"date-time":"2026-07-16T10:58:21Z","timestamp":1784199501000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Effect of pre-shear and dispersity on crystallization of a model polymer with soft pair interactions using molecular dynamics simulations"],"prefix":"10.1063","volume":"165","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-6912-045X","authenticated-orcid":false,"given":"Tzortzis","family":"Koulaxizis","sequence":"first","affiliation":[{"name":"Department of Chemical and Biomolecular Engineering, University of Illinois Urbana-Champaign 1 , Urbana, Illinois 61801,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6120-5072","authenticated-orcid":false,"given":"Antonia","family":"Statt","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, The Grainger College of Engineering, University of Illinois Urbana-Champaign 2 , Urbana, Illinois 61801,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,7,16]]},"reference":[{"key":"2026071606581876400_c1","doi-asserted-by":"publisher","first-page":"1505","DOI":"10.1021\/acs.macromol.5b02688","article-title":"Flow-induced crystallization of polymers: Molecular and thermodynamic considerations","volume":"49","year":"2016","journal-title":"Macromolecules"},{"key":"2026071606581876400_c2","doi-asserted-by":"publisher","first-page":"203","DOI":"10.1122\/1.5056170","article-title":"Understanding flow-induced crystallization in polymers: A perspective on the role of molecular simulations","volume":"63","year":"2019","journal-title":"J.\u00a0Rheol."},{"key":"2026071606581876400_c3","doi-asserted-by":"publisher","first-page":"7146","DOI":"10.1021\/acs.macromol.9b01195","article-title":"Processing pathways decide polymer properties at the molecular level","volume":"52","year":"2019","journal-title":"Macromolecules"},{"key":"2026071606581876400_c4","doi-asserted-by":"publisher","first-page":"502","DOI":"10.1002\/app.21228","article-title":"Flow-induced crystallization in the injection molding of polymers: A thermodynamic approach","volume":"95","year":"2005","journal-title":"J.\u00a0Appl. 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