Polyamide obtainable by a method of polycondensation of a monomer mixture comprising at least: a) monomers of the following general formula: b) monomers of the following general formulae (IIa) and (IIb): X-R 2 -Y (IIa) or c) monomers of the following general formula: Z-R 3 -Z wherein: • R 1 is a hydrocarbon radical comprising at least two carbon atoms, linear or cyclic, aromatic or aliphatic and which may comprise heteroatoms, • A is a covalent bond or an aliphatic hydrocarbon radical comprising from 1 to 6 carbon atoms, • Z represents a carboxylic group, • R 2 and R 3, which may be identical or different, represent substituted or unsubstituted aliphatic, cycloaliphatic or aromatic hydrocarbon radicals comprising from 2 to 20 carbon atoms, and which may comprise heteroatoms, • X represents a carboxylic radical or a primary amino radical; and Y is a primary amino radical when X represents a carboxylic radical, or Y is a carboxylic radical when X represents a primary amino radical, • m being an integer between 3 and 8, the molar concentration of the monomers of formula in the monomer mixture is between 0.01% and 1%, the complement to 100% corresponding to the monomers of general formulae (IIa) or (IIb), and the molar ratio of monomers of formula to monomers of formula is between 0.01 and 0.4, the molar concentration of monomers of formula is between 0.1% and 2%, the remainder to 100% consisting of monomers of formula (IIa) or (IIb). a) monomers of the following general formula: b) monomers of the following general formulae (IIa) and (IIb): X-R 2 -Y (IIa) or c) monomers of the following general formula: Z-R 3 -Z wherein: • R 1 is a hydrocarbon radical comprising at least two carbon atoms, linear or cyclic, aromatic or aliphatic and which may comprise heteroatoms, • A is a covalent bond or an aliphatic hydrocarbon radical comprising from 1 to 6 carbon atoms, • Z represents a carboxylic group, • R 2 and R 3, which may be identical or different, represent substituted or unsubstituted aliphatic, cycloaliphatic or aromatic hydrocarbon radicals comprising from 2 to 20 carbon atoms, and which may comprise heteroatoms, • X represents a carboxylic radical or a primary amino radical; and Y is a primary amino radical when X represents a carboxylic radical, or Y is a carboxylic radical when X represents a primary amino radical, • m being an integer between 3 and 8, the molar concentration of the monomers of formula in the monomer mixture is between 0.01% and 1%, the complement to 100% corresponding to the monomers of general formulae (IIa) or (IIb), and the molar ratio of monomers of formula to monomers of formula is between 0.01 and 0.4, the molar concentration of monomers of formula is between 0.1% and 2%, the remainder to 100% consisting of monomers of formula (IIa) or (IIb). • R 1 is a hydrocarbon radical comprising at least two carbon atoms, linear or cyclic, aromatic or aliphatic and which may comprise heteroatoms, • A is a covalent bond or an aliphatic hydrocarbon radical comprising from 1 to 6 carbon atoms, • Z represents a carboxylic group, • R 2 and R 3, which may be identical or different, represent substituted or unsubstituted aliphatic, cycloaliphatic or aromatic hydrocarbon radicals comprising from 2 to 20 carbon atoms, and which may comprise heteroatoms, • X represents a carboxylic radical or a primary amino radical; and Y is a primary amino radical when X represents a carboxylic radical, or Y is a carboxylic radical when X represents a primary amino radical, • m being an integer between 3 and 8, the molar concentration of the monomers of formula in the monomer mixture is between 0.01% and 1%, the complement to 100% corresponding to the monomers of general formulae (IIa) or (IIb), and the molar ratio of monomers of formula to monomers of formula is between 0.01 and 0.4, the molar concentration of monomers of formula is between 0.1% and 2%, the remainder to 100% consisting of monomers of formula (IIa) or (IIb). the molar concentration of the monomers of formula in the monomer mixture is between 0.01% and 1%, the complement to 100% corresponding to the monomers of general formulae (IIa) or (IIb), and the molar ratio of monomers of formula to monomers of formula is between 0.01 and 0.4, the molar concentration of monomers of formula is between 0.1% and 2%, the remainder to 100% consisting of monomers of formula (IIa) or (IIb).