Spoolable composite pipes for oil and gas flowlines may include an inner extruded tubular liner, a reinforcement layer surrounding the inner extruded tubular liner, and an outer extruded tubular cover surrounding the reinforcement layer. In these spoolable composite pipes, the inner extruded tubular liner may include an aliphatic polyketone. Internally lined pipes for oil and gas flowlines for oil and gas flowlines may include inner extruded tubular liner containing an aliphatic polyketone, and a carbon steel pipe surrounding the inner extruded tubular liner. The spoolable composite pipes and the internally lined pipes may be configured to operate at temperatures of up to about 110 C., and to carry hydrocarbons having an aromatic content of up to about 35% by volume of the total hydrocarbons content.

A remoldable bismaleimide resin and application thereof. The preparation method includes blending 2-allylphenyl glycidyl ether and terephthalic acid in acetonitrile, carrying out an esterification reaction under the condition of quaternary ammonium salt as a catalyst to obtain bis(3-(2-allylphenoxy)-2-hydroxypropyl) terephthalate containing a reversible dynamic group; then uniformly mixing bis(3-(2-allylphenoxy)-2-hydroxypropyl) terephthalate and bismaleimide, curing to obtain the re-moldable bismaleimide resin. The prepared re-moldable bismaleimide resin not only has excellent heat resistance and mechanical properties, but also can be remolded under hot pressing conditions. The preparation method of the re-moldable bismaleimide resin has the advantages of wide raw material sources and simple process, and has a wide application prospect in the fields of aerospace, transportation, electronic information, new energy, insulated electrical industry and the like.