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Correlation between foam performance and molecular structure of fully biodegradable PPC-P enhanced by chain extension

Journal of Environmental Chemical Engineering, ISSN: 2213-3437, Vol: 13, Issue: 1, Page: 115292
2025
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Article Description

Poly(propylene carbonate-co-phthalate) (PPC-P), initially reported and commercialized by our group, is an emerging biodegradable polymer due to its exceptional biodegradability, comprehensive mechanical performances and thermal properties. Therefore, exploiting its potential applications in foaming materials is of considerable importance. Pristine PPC-P foams show insufficient foam quality due to the inferior melt strength reported by our previous work. In this contribution, the modified PPC-Ps with crosslinked networks are successfully prepared by using tri-isocyanate as the crosslinker through the melt blending method. Besides, we also investigated how the blending strategies and crosslinker percentage affect the melt strength (including the balanced torques, gel contents, MFI values and rheological properties), mechanical properties and thermal properties. Followingly, modified PPC-P foams are obtained by using subcritical CO 2 as the blowing agent. Additionally, we established the correlation between molecular structure and foam performance including the solubility and diffusivity of CO 2, cell size, cell density, expansion ratio, and compressive strength. Finally, the effects of two PPC-Ps with different MFIs on the chain extension reaction are also studied by introducing di-isocyanate as co-crosslinker. Notably, the modified PPC-Ps exhibit elevated melt strength and viscoelasticity, enhanced mechanical property, improved thermal property as well as superior foamability. Undoubtably, this work can certainly offer a valid blending methodology to produce modified PPC-P plastic with improved comprehensive property, remarkable melt strength and enhanced foamability.

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