NOVELTY - The encapsulant comprises adjacent thermoplastic layers forming a core-skin assembly. The skin layer consists of a polyamide-grafted polymer (5-50 wt.%) comprising a polyolefin backbone and a residue of unsaturated monomer and a polyamide graft. The polyamide graft is attached with the polyolefin backbone by the residue of unsaturated monomer having a function to react by a reaction of condensation with the polyamide having a terminal amine and a terminal carboxylic acid. The residue of unsaturated monomer is fixed on the polymer backbone by grafting or copolymerization.    USE - The encapsulant is useful in a photovoltaic module to coat a photovoltaic stack (claimed).    ADVANTAGE - The encapsulant enhances the lifespan of the photovoltaic module, and exhibits high transparency and good creep resistance.    DETAILED DESCRIPTION - The encapsulant comprises adjacent thermoplastic layers forming a core-skin assembly. The skin layer consists of a polyamide-grafted polymer (5-50 wt.%) comprising a polyolefin backbone and a residue of unsaturated monomer and a polyamide graft. The polyamide graft is attached with the polyolefin backbone by the residue of unsaturated monomer having a function to react by a reaction of condensation with the polyamide having a terminal amine and a terminal carboxylic acid. The residue of unsaturated monomer is fixed on the polymer backbone by grafting or copolymerization, where the number of monomer is less than or equal to 10. The polyamide-grafted polymer has a flow temperature (75-160 degrees C), which is defined as a glass transition temperature of the polyamide graft and the polyolefin backbone. The skin layer and the core layer are nanostructured with each other. An average molecular mass of polyamide graft is 2000-3000 g.mol-1. The polyamide graft comprises a copolyamide. The polyolefin backbone has a melting temperature of greater than or equal to 90 degrees C. An INDEPENDENT CLAIM is included for a photovoltaic module.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a photovoltaic module.    Photovoltaic stack (10)    Photovoltaic module (20)    Upper part (22)    Upper protective layer (24)    Backsheet. (26)