Multi-layer compositions comprising a fluoropolymer

A method of bonding fluoropolymer to substantially non-fluorinated polymeric material, the method comprising the steps of:

• (a) providing an amide group-containing substantially non-fluorinated polymer;
• (b) treating the substantially non-fluorinated polymer with a base to form a base-treated, substantially non-fluorinated polymeric material where the base is selected from the group consisting of:
• (1) those bases represented by the formulas:
• X+(OH)−n
• X+(OR)−n
• X+(OCY2Rf)−n
• X+(OSi(R)3)−n
• X+(SC(O)R)−n
• where:
• n is 1 or 2;
• X is a monovalent or divalent alkali or alkaline earth ion or is an ammonium ion;
• R is a substituted or unsubstituted alkyl, aryl, allyl, aralkyl or arallyl group that may contain one or more catenary or noncatenary heteroatoms and that may contain linear or branched and cyclic or acyclic segments;
• Rf is a partially or fully fluorinated, substituted or unsubstituted alkyl, aryl, allyl, aralkyl or arallyl group that also may contain one or more catenary or noncatenary heteroatoms and that may contain linear or branched and cyclic or acyclic segments;
• and
• each Y is independently a hydrogen atom or is an R or Rf group with the proviso that both Y groups are not Rf;
• and
• (2) ammonium carbonate, ammonium hydroxide, and sodium sulfide;
• (c) providing a fluoropolymer;
• and
• (d) forming a multi-layer article comprising a substantially non-fluorinated layer made of the base-treated, substantially non-fluorinated polymeric material in contact with a fluorinated layer made of the fluoropolymer and exposing the multi-layer article to temperature and pressure conditions sufficient to bond the layers.