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Structure–properties correlations in compatibilized polyamide/thermoplastic elastomer/nanoclay mixtures: interrelationship among non-isothermal crystallization kinetics, morphology and viscoelastic responses

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Abstract

In this study, the influences of styrene–butadiene–styrene block copolymer (SBS), a thermoplastic elastomer, nanoclay (NC) and maleic anhydride grafted styrene–ethylene/butylene–styrene (m-SEBS), a compatibilizer, on the non-isothermal crystallization kinetics of polyamide 12 (PA12) have been evaluated using different theoretical models including Avrami, Jeziorny, Ozawa and Mo as well as Kissinger, Takhor and Augis and Bennett equations. Using microscopic observations, X-ray diffraction patterns and rheological responses, the interrelations among the crystallization kinetics variables, morphology and molecular dynamics of compatibilized PA12/SBS rubber/NC mixtures have been thoroughly investigated. A study on different kinetics variables such as crystallization half-time, Avrami index and F(T) demonstrates that the PA crystallization rate has an upward trend against the compatibilizer level within the studied compatibilizer content, while the rate shows a maximum value against NC loading and SBS content. The calculation of the rubber particles diameter, the distance between the rubber particles, PA/SBS interfacial area and normalized chain relaxation time clarifies that more heterogeneous nucleation sites are provided for PA chains by NC platelets and SBS particle surfaces at higher contents (higher amounts in the ranges of 15–21 mass% for SBS and 3–7 mass% for NC), though the molecular movements are restricted more as well, which reduces the growth rate of PA crystals.

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Authors and Affiliations

  1. Fouman Faculty of Engineering, College of Engineering, University of Tehran, Fouman, Iran

    Ahmadreza Abbasi

  2. Computing Science Department, University of Alberta, Edmonton, Canada

    Ali Naeim Abadi

  3. Caspian Faculty of Engineering, College of Engineering, University of Tehran, P.O. Box 43841-119, Guilan, Iran

    Farkhondeh Hemmati, Jamshid Mohammadi-Roshandeh & Tara Farizeh

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Abbasi, A., Abadi, A.N., Hemmati, F. et al. Structure–properties correlations in compatibilized polyamide/thermoplastic elastomer/nanoclay mixtures: interrelationship among non-isothermal crystallization kinetics, morphology and viscoelastic responses. J Therm Anal Calorim 148, 3373–3394 (2023). https://doi.org/10.1007/s10973-023-12001-x

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