Method for improving mechanical strength of bondings made with an adhesive based on curable resin by chain polymerization

A process of bonding a first substrate and a second substrate with an adhesive comprising a resin that can be cured by chain transfer polymerization, wherein each of said first substrate and said second substrate has a surface where the bonding is to be carried out and wherein the surface comprises grafted chemical groups, said process comprising:

• a) depositing the adhesive on the surface where the bonding is to be carried out of at least one of the first substrate and the second substrate;
• b) bringing into contact the surfaces where the bonding is to be carried out of the first substrate and the second substrate;
• and
• c) inducing the chain transfer polymerization of the curable resin present in the adhesive so as to obtain the curing of said resin and thereby the bonding of the first substrate and the second substrate;
• and wherein the chemical groups which are grafted on the surface of both the first substrate and the second substrate are carbon-based groups comprising at least one function selected from the group consisting of —SH, —PH—, —PH2 and ═S, and wherein said chemical groups act as chain transfer agents during the chain transfer polymerization of the curable resin present in the adhesive.