Polymer Nanocomposites with a Low Thermal Expansion Coefficient
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- 作者：YuanQiao Rao ; Thomas N. Blanton
- 刊名：Macromolecules
- 出版年：2008
- 出版时间：February 12, 2008
- 年：2008
- 卷：41
- 期：3
- 页码：935 - 941
- 全文大小：350K
- 年卷期：v.41,no.3(February 12, 2008)
- ISSN：1520-5835
文摘
In this paper, a PEO-clay(PVP) nanocomposite was designed and the nanocomposite film wasproduced. The film exhibits a low thermal expansion coefficient of ~10 ppm/
C, which is similar to that ofmetals. The film also exhibits an unexpected high heat distortion temperature, which is much higher than themelting point of polyethylene oxide (PEO), as well as a much improved O2 barrier property, high stiffness, andhigh strength. The significant property improvements are related to the structure of the formed composite. In thiscomposite, the clay crystal is first intercalated by polyvinyl pyrrolidone (PVP), which regulates the stacking ofthe clay sheets and forms a well-ordered intercalated clay crystal. This intercalated clay crystal directs thecrystallization and crystal orientation of the PEO in the composite. The property change with the amount of clayadded suggests that there is a critical clay loading of ~10 vol % beyond which the polymer based compositeexhibits superior properties.
C, which is similar to that ofmetals. The film also exhibits an unexpected high heat distortion temperature, which is much higher than themelting point of polyethylene oxide (PEO), as well as a much improved O2 barrier property, high stiffness, andhigh strength. The significant property improvements are related to the structure of the formed composite. In thiscomposite, the clay crystal is first intercalated by polyvinyl pyrrolidone (PVP), which regulates the stacking ofthe clay sheets and forms a well-ordered intercalated clay crystal. This intercalated clay crystal directs thecrystallization and crystal orientation of the PEO in the composite. The property change with the amount of clayadded suggests that there is a critical clay loading of ~10 vol % beyond which the polymer based compositeexhibits superior properties.