Method for producing an ablative resin

A method for producing a propulsion nozzle, wherein the nozzle is produced from a phenolic resin obtained at least by carrying out the following step:

• a) pre-polymerization of an aromatic aldehyde compound with a phenolic compound in order to obtain the phenolic resin, the aromatic aldehyde compound having one or other of the following formulae A and B:
• the aromatic aldehyde compound being polyfunctional and formulae A and B being such that n1 is an integer between 0 and 4 and when n1 is greater than or equal to 2, the substituents R1 are identical or different, n2 is an integer between 0 and 5 and when n2 is greater than or equal to 2, the substituents R2 are identical or different and n3 is an integer between 1 and 6, and
• formulae A and B being such that the substituents R1 and R2 are chosen independently from one another from:
• —OH, —COOH, —CHO, the groups —O-Alk wherein Alk denotes a substituted or unsubstituted alkyl chain of 1 to 4 carbon atoms, saturated or unsaturated, substituted or unsubstituted hydrocarbon-based chains comprising between 1 and 20 carbon atoms, interrupted or not interrupted with one or more heteroatoms, and having or not having one or more carbonyl or carboxylic acid functions, substituted or unsubstituted, monocyclic or polycyclic, saturated, unsaturated or aromatic carbocyclic or heterocyclic groups having or not having one or more carbonyl or carboxylic acid functions, and substituted or unsubstituted aryl groups having or not having one or more carbonyl or carboxylic acid functions,
• R2 also denoting or not denoting a radical of formula A1 in formula A above or a radical of formula B1 in formula B above and R1 also denoting or not denoting a radical of formula A2 in formula A above, formulae A1, A2 and B1 being the following:
• in formulae A1, A2 and B1, R1, R2, n1, n2 and n3 are as defined above.