期刊
COMPOSITES PART B-ENGINEERING
卷 230, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.109554
关键词
Polyvinylidene fluoride (PVDF); Polymethyl methacrylate (PMMA); CO 2 foaming; Thermal insulation
资金
- National Natural Science Foundation of China (NSFC) [51875318]
- Shandong Provincial Key Research and Development Program (Major Scientific and Technological Innovation Project) [2019JZZY020205]
- innovation Guidance Program (Shandong-Chongqing Science and Technology Cooperation) of Shandong Province [2020LYXZ033]
The innovative method of blending PVDF with PMMA resulted in foam with wider foaming window and excellent performance. The blend foams showed improved expansion ratio, thermal insulation, and flame retardancy, with high rigidity and lower heat release rate.
An innovative method of improving PVDF foaming behavior and foam performance by blending with polymethyl methacrylate (PMMA) was devised, and lightweight, strong, flame-retardant foams with wider foaming window and excellent thermal insulation performance were successfully achieved. PMMA not only improves CO2 uptake and melt viscoelasticity, but also decreases PVDF crystallinity and increases melting range of PVDF crystals. Compared to PVDF foams, expansion ratio of the blend foams increased from 21.9 to 31.2, and effective foaming window was expanded from 3.6 degrees C to 17.4 degrees C. Thanks to the blend foams' high expansion and PMMA's strong infrared absorption ability and high rigidity, thermal conductivity and compression modulus of the foams are 33.85 mW m-1 K-1 and 3.51 MPa, respectively. Moreover, the blend foams also show a lower heat release rate and favorable flame retardancy.
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