Filler-Induced Structural Order and Mechanical Properties of Polystyrene-Silica Nanocomposites

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概要

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• This study is concerned with the relationship between wide angle X-ray scattering (WAXS) analysis and physical properties of amorphous polystyrene (PS)-silica (SiO2) composites. Nanoporous SiO2 for the fillers was prepared by the hydrothermal reaction and the structures of the composites were examined by WAXS. In their WAXS patterns, two characteristic peaks, inner peak and outer peak, were observed at q ≈ 7 nm−1 and 15 nm−1 corresponding to the intermolecular structure of PS chains and the intramolecular order of benzene rings, respectively. The ratio (Iin⁄Iout=P) in intensity of the inner peak (Iin) to outer peak (Iout) affords the structural parameter to well characterize the intermolecular and intramolecular structures of PS molecules and the P values are observed to change widely from 0.183 to 1.16 depending on the material compositions. The elongation at the break point increases monotonously with increasing P, whereas the yield strength and the Youngs modulus decrease with P for P=0.497 or below but remain almost constant for larger P values. The elongation of 4.5% for (PS+MPS) / SiO2 is enormously larger than those for PS and the other composites, in contrast to a slight decrease of the other two properties relative to those for PS. It is also revealed that a strong interaction works between the COO or COOH groups of maleic anhydride modified polystyrene (MPS) and the OH groups of SiO2, which makes the PS polymer molecules to stack regularly on SiO2 nanofillers, leading to control the physical properties of the composites.

• 一般社団法人　日本レオロジー学会の論文
• 2005-12-15

著者

• Kijima Tsuyoshi

  Department Of Applied Chemistry Faculty Of Engineering Miyazaki University

• Someya Keisuke

  Department Of Functional Materials Science Materials Science And Energy Engineering Graduate School

• KONDO Yoshikazu

  Advanced Materials Research Lab. KRI Inc.

• YAMADA Nobumitsu

  Department of Functional Materials Science, Materials Science and Energy Engineering, Graduate Schoo

• Yamada Nobumitsu

  Department Of Functional Materials Science Materials Science And Energy Engineering Graduate School

• Kijima Tsuyoshi

  Department Of Functional Materials Science Materials Science And Energy Engineering Graduate School

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