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Preparation and characterization of nano-hybrids combining poly(urea-imide) with a porous silica-pillared layered phase

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Abstract

The mechanical, thermal and dielectric properties of nano-hybrids comprised of poly(urea-imide) (PUI) and a highly porous nano-silica-pillared layered clay were studied. The PUI was prepared from an aromatic diamine (4,4′-diphenylmethane diisocyanate; MDI), an aromatic dianhydride (pyromellitic diahydride; PMDA) and 4,4′-oxydianiline (ODA). Different ratios of the nano-silica-pillared layered clays (NSP7030) were modified using tetraethoxysilane (TEOS) via a sol–gel process. The TEOS modified NSP7030 clays (NSP7030/TEOS) were further calcined at 500 °C (C-NSP7030/TEOS). The nano-hybrids comprised of PUI and C-NSP7030/TEOS clays were characterized by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and their mechanical and dielectrical properties et al. The results showed that the exfoliated (major) and intercalated (minor) structures of the nano-silica-pillared layered clays (NSP7030) were successfully modified by TEOS via a sol–gel process. Furthermore, the nano-hybrids exhibited slightly higher thermal stability than the pure PUI component. The highest thermal decomposition temperature at 5 % weight loss (Td 5 %) of the material degraded was at 510 °C because the nano-hybrids contained poly(urea-imide) with 15 wt.% C-NSP7030/TEOS(1/5). Pure PUI exhibited good values of tensile strength and elongation which were 96.1 MPa and 9.0 %. After the addition of C-NSP7030/TEOS(1/5), the values of tensile strength and elongation decreased slightly. Surprisingly, the dielectric constant of nano-hybrids containing 15 wt.% C-NSP7030/TEOS(1/5) could be enhanced from 3.88 to 3.31. In addition, agglomerations of the C-NSP7030/TEOS(1/5) clay are observed in the micrographs when the PUI matrix was loaded with 10 and 15 wt% of the C-NSP7030/TEOS(1/5) clays.

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Acknowledgments

The authors gratefully acknowledge the support for this research by the Ministry of Economic Affairs in Taiwan under the grant numbers 101-EC-17-A-08-S1-205 and Kaohsiung Medical University in Taiwan under the grant numbers KMU-TP103B03, respectively

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Authors and Affiliations

  1. Institute of Polymer Science and Engineering, College of Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei City, 10617, Taiwan

    Wei-Yao Chang, Ching-Nan Chuang, Szu-Hsien Chen & Kuo-Huang Hsieh

  2. Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, No. 100, Shih-Chuan 1st Road, Kaohsiung, 80708, Taiwan

    Chih-Kuang Wang

  3. Orthopaedic Research Center, Kaohsiung Medical University, No. 100, Shih-Chuan 1st Road, Kaohsiung, 80708, Taiwan

    Chih-Kuang Wang

  4. Department of Chemical Engineering, College of Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei City, 10617, Taiwan

    Kuo-Huang Hsieh

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  1. Wei-Yao Chang
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  2. Ching-Nan Chuang
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  3. Szu-Hsien Chen
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  5. Kuo-Huang Hsieh
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Correspondence to Chih-Kuang Wang or Kuo-Huang Hsieh.

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Chang, WY., Chuang, CN., Chen, SH. et al. Preparation and characterization of nano-hybrids combining poly(urea-imide) with a porous silica-pillared layered phase. J Polym Res 22, 205 (2015). https://doi.org/10.1007/s10965-015-0839-7

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  • DOI: https://doi.org/10.1007/s10965-015-0839-7

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