{
  "abstract": "Upcycling of polyethylene terephthalate (PET) waste into high-value polymeric materials offers a promising pathway toward circular and sustainable polymer engineering. In this work, polyurethane (PU) films were synthesized from recycled PET (rPET)-based polyols, and the influence of the isocyanate index (NCO index: 100-200) on the network structure and functional properties of the resulting materials was investigated. FT-IR results supported the formation of urethane linkages between the rPET-based polyol and polymeric methylene diphenyl diisocyanate (PMDI), indicating successful network formation. Increasing the NCO index significantly enhanced cross-link density, reflected by an increase in gel content from 54.97 to 93.46% and a decrease in swelling ratio from 254.58% to 133.30%. This structural evolution led to improved mechanical performance, with tensile strength and Young's modulus reaching 7.26 and 5.29 N/mm 2 , respectively. Thermal analysis further revealed an increase in glass transition temperature (-32.05-0.93 °C) and enhanced thermal stability with higher char yields (17.57-24.71%). Surface analyses demonstrated smoother, denser, and more hydrophobic morphologies at elevated NCO indices. An optimal balance of mechanical, thermal, and surface properties was achieved at NCO indices of 150-175, highlighting the potential of rPET-based PU films as sustainable coating and engineering materials for advanced applications.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 8,
  "authors": [
    {
      "name": "Panachai Thusanaphoom"
    },
    {
      "name": "Jureeporn Yuennan"
    },
    {
      "name": "Wichain Chailad"
    },
    {
      "name": "Sineenard Songsri"
    },
    {
      "name": "Vanchai Laemlaksakul"
    },
    {
      "name": "Jennifer Rodon-Fores"
    },
    {
      "name": "Yutthana Wongnongwa"
    },
    {
      "name": "Nathapong Sukhawipat"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1vfq6d18e2kbc.bib",
  "cited_by": 1,
  "doi": "10.1021/acspolymersau.6c00147",
  "fulltext_url": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13673876/?tool=EBI",
  "id": "1vfq6d18e2kbc",
  "issns": [
    "2694-2453"
  ],
  "landing_url": "https://hal.science/hal-05772449v1",
  "language": "en",
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.chim"
    ],
    [
      "hal",
      "0.sdv"
    ],
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      "hal",
      "1.sdv.ib"
    ],
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      "openalex",
      "2507|Polymer crystallization and properties"
    ]
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  "openalex": "W7196950261",
  "pdf_url": "https://hal.science/hal-05772449/document",
  "pmcid": "PMC13673876",
  "pmid": null,
  "published": "2026-08-06",
  "publisher": "American Chemical Society",
  "ris": "https://research.draconitic.com/paper/1vfq6d18e2kbc.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:44Z",
      "native_id": "hal-05772449",
      "source": "hal",
      "url": "https://hal.science/hal-05772449v1"
    },
    {
      "first_seen": "2026-10-30T12:18:25Z",
      "native_id": "PMC:PMC13673876",
      "source": "europepmc",
      "url": "https://europepmc.org/article/PMC/PMC13673876"
    }
  ],
  "subjects": [
    {
      "field": "biology",
      "origin": "hal:1.sdv.ib",
      "subfield": "systems-synthetic"
    },
    {
      "field": "chemistry",
      "origin": "hal:0.chim",
      "subfield": "general"
    }
  ],
  "title": "Upcycling Recycled PET into High-Performance Polyurethane Coating and Engineering Materials: Effect of NCO Index on Mechanical, Stability, and Surface Properties",
  "title_text": "Upcycling Recycled PET into High-Performance Polyurethane Coating and Engineering Materials: Effect of NCO Index on Mechanical, Stability, and Surface Properties",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:25Z",
  "url": "https://research.draconitic.com/paper/1vfq6d18e2kbc",
  "venue": "ACS Polymers Au",
  "versions": []
}