Abstract
Polymer rigid foams are highly required in the fields of wind power, transportation and construction due to lightweight and high performances. Herein, we have established a novel strategy of “plasticizing-foaming-reinforcing” (PFR) for preparing reprocessable thermoplastic/thermoset blend foams. PVC and the crosslinking monomers for polyurea (CMs) were melting mixed and foamed via supercritical CO2 (sc-CO2) foaming process followed by post-curing. The resultant PVC/polyurea blend foam presents ultra-high expansion ratio (51 times) and much smaller cell size as compared to those prepared by the traditional chemical foaming method, thus displays excellent thermal insulation performance (26.95 mW m−1 K−1) and excellent mechanical robustness, especially at lower temperature. Furthermore, the PFR strategy provides the PVC/CMs blend foam with a flexible molding ability at room temperature, allowing to form versatile three-dimensional (3D) structures. Strikingly, the microphase-separation structure of PVC-encapsulated polyurea in the cell wall endows the PVC/polyurea blend foam with excellent shape memory behavior. The PFR strategy paves a new avenue to fabricate thermoplastic/thermosetting (TP/TS) polymer blend foams in an easy-going green foaming process, which combines the performance advantages of both types of resins simultaneously possessing recyclable property.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.