Foaming of PVDF/PMMA Blend-based Nanocomposites through sc-CO2 and the Foams’ Properties Characterization

• Main Authors: Chiao Li Huang, 黃巧俐
• Other Authors: F. C. Chiu
• Format: Others
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/00911732111033569800

碩士 === 長庚大學 === 化工與材料工程學系 === 98 === Abstract The foaming of PVDF/PMMA blend-based nanocomposites through sc-CO2, and the resulting foams’ properties were studied. Two kinds of organoclays (20A and 30B) served as the nanofillers for the composites preparation. XRD patterns show that foaming condition and PMMA content did not affect the development of α crystalline form of PVDF, but the presence of organoclays induced the  crystalline form of PVDF. The 30B exhibited a better compatibility with PVDF/PMMA than that of 20A as revealed by XRD and TEM experiments. SEM images show that, depending on the foaming condition and sample’s formulation, various cell morphologies of the foams were developed. For instance, the spherulitic structure of PVDF exerted a significant effect on the cell morphology of PVDF-rich foams. The cell appeared in the amorphous domains, which are mainly located between the PVDF spherulites and their interlamellar regions. The cell size was noted to increase with increasing PMMA content in the blends; the additions of organoclays led to a reduction in the cell size. The interesting crystallization and melting behaviors of the prepared samples were observed as well.