MWCNT-driven modulation of thermal and flow properties in PTT/PP polymer systemsRamachandran, Ajitha A. (Avtor) Reghunadhan, Arunima (Avtor) Sari, P. S. (Avtor) Huskić, Miroslav (Avtor) Thomas, Sabu (Avtor) polymer blendsthermal propertiesviscoelastic propertiesThe thermal and viscoelastic performance of polymer blends is decisive for their deployment in advanced engineering and electronic applications. Here, we report a systematic investigation of immiscible poly(trimethylene terephthalate) (PTT)/polypropylene (PP) blends reinforced with multiwalled carbon nanotubes (MWCNTs). While the incorporation of MWCNTs did not markedly alter the thermal degradation profiles, it significantly modified the viscoelastic behavior by inducing a constrained polymer region within the PTT phase. Quantitative analysis of filler dispersion effectiveness, entanglement density, reinforcing efficiency, and constrained volume provides new insights into nanotube–matrix interactions. Rheological results revealed a terminal-to-nonterminal transition with increasing nanotube content, confirming percolated network formation at low filler loadings. These findings establish clear structure–property correlations that extend beyond qualitative descriptions, offering a predictive framework for tailoring immiscible blends through nanofiller engineering. Such insights highlight the potential of PTT/PP/MWCNT systems in functional applications, including lightweight structural components and conductive composites for electronics.The Royal Society of Chemistry20262026-04-09 13:00:22Neznano28852UDK: 54ISSN pri članku: 2755-371XDOI: 10.1039/D5LP00324ECOBISS_ID: 274380547Združeno kraljestvosl© 2026 The Author(s).