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  2. ncstate.pressbooks.pub ncstate.pressbooks.pub
    End of Life of Polymers
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    1. Zhuo0807 11 Sep 2025
      PET has been demonstrated to dissolve in N-Methyl-2-pyrrolidone and be re-precipitated in n-octane, but the researchers encountered challenges of high viscosity and low polymer concentrations (0.2 kg/L of solvent) along with high temperatures at 165 ℃. The resultant polymer was significantly less crystalline than virgin material but further recycling did not significantly affect the material’s properties14

      Energy Consumption: The text notes that PET requires 165℃ for dissolution and PP needs 135℃. How do these high temperatures compare in energy cost to traditional mechanical recycling methods, such as melt reprocessing? Would this method be more or less energy-intensive on an industrial scale?

    2. Zhuo0807 11 Sep 2025
      However, it is difficult to break the C-C bonds along the backbone, so PP is generally not chemically recycled in the same way that polyester or other non-olefin polymers are.

      PP within the circular economy and clarifies why its recycling predominantly relies on physical or thermal methods rather than chemical depolymerization.

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    ncstate.pressbooks.pub/advancesinpolymerscience/chapter/end-of-life-of-polymers/