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Poly(amide acid) was prepared from 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) and p-phenylenediamine (PDA) and was then reacted with NaH and various kinds of alkyl iodides to transform it into its alkyl esters. The cast films were imidized as fixed on glass substrates to give polyimide films. The tensile modulus of polyimide films prepared from the methyl ester precursor was lower than that...
Carbon-coated α-iron particles ca 100mm in diameter were prepared through a simple heat-treatment of mixtures of Fe 3 O 4 and polyvinylchloride (PVC) at 1000 o C in an Ar flow. After HCl treatment of the particles to remove iron and iron compounds, hollow carbon particles were seen under the scanning electron microscope. According to thermogravimetric analysis of the Fe ...
Two types of boron containing polyimide (Kapton type) film were prepared either by adding dihydroxyphenylborane (DPB) to polyamic acid [mixing method] or by using diaminodiphenyl ether having a boron containing functional group (DDE–B) to prepare polyamic acid [substitution method]. Formed polyimide films containing boron were carbonized at 600–1200°C. By doping boron into the precursor polyimide,...
Carbonization of stabilized PAN fibers was studied by focusing nitrogen using elemental analysis and XPS, in relation to mechanical properties. A difference in denitrogenation on the surface and in the bulk of the fibers was observed in a range of carbonization temperatures between 600 and 1000 o C, with denitrogenation on the surface occurring much earlier (600-800 o C) than in the...
Polyamide acid was prepared from pyromellitic dianhydride (PMDA) and oxydianiline (ODA), and was then reacted with NaH and various kinds of alkyl halides for transformation into alkyl ester. The cast films were imidized as fixed on glass substrate to give Kapton-type polyimide films, and were then carbonized by heating to 900°C. It was shown that the electrical conductivity of the carbonized films...
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