Journal
POLYMER ENGINEERING AND SCIENCE
Volume 62, Issue 11, Pages 3543-3552Publisher
WILEY
DOI: 10.1002/pen.26125
Keywords
foam injection molding; mechanical properties; Polyvinylidene fluoride
Categories
Funding
- National Natural Science Foundation of China [52003280]
- Chinese Academy of Sciences Pioneer Hundred Talents Program
- Zhejiang Provincial Natural Science Foundation of China [LQ21B040003]
- Provincial Key Research and Development Program of Zhejiang [2021C01005]
- S&T Innovation 2025 Major Special Programme of Ningbo [2019B10092, 2021Z052]
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PVDF foam materials with excellent mechanical properties were successfully fabricated by adding PMMA as a modifier, using supercritical CO2 as a blowing agent, and employing foam injection molding technology.
Polyvinylidene fluoride (PVDF) foams prepared by batch foaming have been intensively studied, but it still remains a challenge to fabricate high-performance PVDF foams for structural applications. Herein, by adding polymethyl methacrylate (PMMA) as the minor component, the blend foams were successfully fabricated using supercritical carbon dioxide (CO2) as a green blowing agent via foam injection molding (FIM) with core-back operation. The added PMMA could reduce the crystal size of PVDF. Owing to fine cellular structure and small crystal sizes, the injection-molded blend microcellular foams exhibited superior mechanical properties. Especially, the elongation at break and specific breaking energy of the blend foam with 40% void fraction were separately increased by 184% and 297% compared to that of the PVDF foam. These findings revealed that the lightweight microcellular PVDF foams with improved toughness could be manufactured by the scale-up and efficient FIM technology, which showed a promising future in automotive and other structural applications.
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