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Issue 87, 2014
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An investigation of physico-chemical properties of a new polyimide–silica composites

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Abstract

In the present study, a novel diamine 1,4-bis[4-(hydrazonomethyl)phenoxy]butane (4-BHPB) has been successfully synthesized by a facile method. 4-BHPB was reacted with pyromellitic dianhydride (PMDA) to derive a novel polyimide (PI). Highly compatibilized PI–SiO2 nanocomposites were tailored using synthesized PI matrix and modified silica nanoparticles. The compatibility between organic–inorganic (O–I) components was remarkably improved by charge transfer complex (CTC) formed between PI chains and modified silica nanoparticles. PI chains have electron donor and acceptor groups (diamine and dianhydride portion, respectively). These groups were generated in silica nanoparticles by the organic modification through 2,6-bis(3-(triethoxysilyl)propyl)pyrrolo[3,4-f]isoindole-1,3,5,7(2H,6H)-tetraone (M-SiO2), which in turn, was prepared reacting PMDA with 3-aminopropyltriethoxysilane. Sol–gel method was used for in situ synthesis of silica nanoparticles from a mixture of M-SiO2 and TEOS. The enhanced compatibility between O–I phases through CTC formation furnished PI–SiO2 nanocomposites (designated as OI-M) with improved thermal stability, hydrophobicity, and surface smoothness. For the comparison of properties, another series of PI–SiO2 composites (OI-UM) were prepared dispersing unmodified silica micro-particles into PI matrix. OI-UM hybrid system does not contain CTC between PI matrix and silica particles. The structure of the monomer, PI, and organically modified silica network was analyzed by FTIR, and NMR spectroscopy. Thermogravimetric analysis, FE-SEM, contact angle measurement, and AFM were used to study thermal and morphological properties of the synthesized PI–SiO2 hybrids.

Graphical abstract: An investigation of physico-chemical properties of a new polyimide–silica composites

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Article information


Submitted
20 Jun 2014
Accepted
01 Sep 2014
First published
01 Sep 2014

RSC Adv., 2014,4, 46587-46594
Article type
Paper
Author version available

An investigation of physico-chemical properties of a new polyimide–silica composites

T. Akhter, O. O. Park, H. M. Siddiqi, S. Saeed and K. M. Saoud, RSC Adv., 2014, 4, 46587
DOI: 10.1039/C4RA06025C

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