| 摘要 |
<p>1385352 Carbon fibre resin compositions COMMISSARIAT A L'ENERGIE ATOMIQUE 15 March 1972 [19 March 1971] 11983/72 Heading C1A [Also in Division C3] A composite material comprising carbon fibres and resin is prepared by (a) treating carbon fibres with a graft or block copolymer to form chemical bonds between the carbon fibres and the copolymer, and (b) incorporating the treated fibres in a resin, the block or graft copolymer comprising a first type of sequence (A) which forms the chemical bonds with the fibres and is incompatible with the resin, and a second type of sequence (B) which is compatible with the resin. In a modification step (a) comprises forming chemical bonds between the carbon fibres and a polymer of sequence A, and grafting polymer of sequence B on to the polymer of sequence A. Sequence A may be bonded by covalent bonds formed by radical grafting or anionic grafting, or by ionic bonds, e.g. hydrogen bonds, dipole-dipole bonds or saline bonds. Sequence B may be grafted on sequence A by means of covalent bonds or ionic bonds. In the examples carbon fibres are oxidized by ozone, treated with sodium hydroxide, acidified with HCl, washed with distilled water, dried and salified with sodium methanolate in the presence of phenol-phthalein and then immersed in solutions of a block copolymer which had previously been salified with sodium methanolate (poly- (carboxylated) isoprene-b-styrene-co-maleic anhydride), pure polyisoprene-maleic anhydridestyrene block copolymer in the carboxylated state, a carboxylated, crude graft polyisoprenemaleic anhydride-styrene copolymer and a non- carboxylated polyisoprene-maleic anhydridestyrene graft copolymer which had been salified with NaOH. In Example 6 a carboxylated polybutadiene is bonded to carbon fibres which have been preoxidized in air and then maleic anhydride-styrene copolymer is grafted on to the polybutadiene in the presence of benzoyl peroxide and benzene. The treated fibres are incorporated into an epoxy resin.</p> |
