Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/13450
Title: Synthesis, fabrication, characterization, properties and thermal degradation kinetics study of low-K poly(ether-imide)s and co-poly(ether-imide)s, and poly(ether-imide)/MMT clay nanocomposites
Authors: ROHITKUMAR H VORA
Keywords: Fluoro-poly(ether imide), Fluoro-copoly(ether imide), Fluoro-poly(ether imide)/MMT clay nanocomposites, Estimation of Low-dielectric constant
Issue Date: 7-Oct-2003
Source: ROHITKUMAR H VORA (2003-10-07). Synthesis, fabrication, characterization, properties and thermal degradation kinetics study of low-K poly(ether-imide)s and co-poly(ether-imide)s, and poly(ether-imide)/MMT clay nanocomposites. ScholarBank@NUS Repository.
Abstract: The objective of the PhD thesis research was the synthesis, film fabrication, characterization, and structure properties study of series of partially fluorinated poly(ether imide) (6F-PEI), copoly(ether imide)s (6F-CoPEI) and (6F-PEI)/organosoluble MMT clay nanocomposite from commercially available monomers and materials. The approach involved the polymerization of 2,2a??-bis(3,4-dicarboxyphenyl) hexafluropropane dianhydride (6FDA) with a variety of di-ether-containing (non-fluorinated) diamines: 4,4-bis(3-aminophenoxy)diphenyl sulfone (m-SED), 4,4-bis(4-aminophenoxy)diphenyl sulfone (p-SED), and 4,4-bis(4-aminophenoxy)diphenyl propane (BPADE). The films of these melt processable (6F-PEI) and (6F-CoPEI) polymers from p-SED and BPADE having trifluoromethyl groups showed excellent electrical properties. Fluoro-poly(ether imide)s [6FDA + p-SED] and [6FDA + BPADE] had dielectric constants (i?Ya??) of 2.74 and 2.65 at 10MHz respectively. Mathematical model equations ( Vora-Wang Equations) were developed to estimate the dielectric constant (i?Ya??co) of copolyimides. For the copoly(ether imide)s, the dielectric constant values were in the range between 3.05 to 3.10 at 1 kHz. These values are lower than the commercially available poly(ether imide) ULTEMi??1000 (3.15), and polyimide Kaptoni??H films (3.5) at 1 kHz. In addition, (6F-PEI)s, (6F-CoPEI)s, and nanocomposite films not only showed extraordinary long-term thermo-oxidative stability (TOS), but also exhibited excellent reduced water absorption relative to commercial polyimides. The transparencies of polymer films were in the range between 80-90% at 500nm solar wavelength. The nanocomposites showed excellent solvent resistance, increased glass transition (Tg) values with increasing clay content, a sharp lowering of the coefficient of thermal expansion (CTE), and improved surface energy.
URI: http://scholarbank.nus.edu.sg/handle/10635/13450
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