Copolymers of perfluorotrivinyltriazine compounds and methods for synthesizing the copolymers

A copolymer comprising copolymerized units of a perfluorotrivinyltriazine monomer of formula (1):

• wherein the three Rf groups are the same or different, and wherein the three Rf groups are selected from the group consisting of —(CF2)n—, wherein 1<n<6;
• —(CF2)m—[OCF(CF)CF2]p—, wherein 1≤m≤4 and 1≤p≤4;
• and
• —[(CF(CF3)—O)x—(CF2)k]—, wherein 1≤x≤3 and 1≤k≤5;
• and
• further comprising copolymerized units of one or more one or more cure-site monomers selected from the group consisting of bromotetrafluoro-1-butene (BTFB);
• iodotetrafluoro-1-butene (ITFB);
• 3-(1-[difluoro((trifluoroethenyl)oxy)-methyl)-1,2,2,2,-tetrafluoroethoxy)-2,2,3,3,-tetrafluoropropane nitrile (8-CNVE);
• and 1,1,2,2-tetrafluoro-2-((1,1,1,2,3,3-hexafluoro-3-((1,2,2-trifluorovinyl)oxy) propan-2-yl)oxy)ethane-1-sulfonyl azide (8-SAVE);
• said copolymer comprising unreacted pendant perfluorovinyl groups in a finite amount up to 200 mol %, based on the total number of moles of copolymerized residues of the perfluorotrivinyltriazine monomer (1), said unreacted perfluorovinyl groups being pendant from the triazine ring of the perfluorotrivinyltriazine monomer (1).

A process for producing a cross-linked fluoroelastomer, said process comprising the steps of:

• a) providing a perfluorotrivinyltriazine monomer of formula (1):
• wherein the three Rf groups are the same or different, and wherein the three Rf groups are selected from the group consisting of —(CF2)n— (n=1-6);
• —(CF2)m—[OCF(CF3)CF2]p— (m=1-4, p=1-4);
• and
• [(CF(CF3)—O)x—(CF2)k]—, wherein 1≤x≤3 and 1≤k≤5;
• b) providing one or more other comonomers;
• c) providing one or more one or more cure-site monomers selected from the group consisting of bromotetrafluoro-1-butene (BTFB);
• iodotetrafluoro-1-butene (ITFB);
• 3-(1-[difluoro((trifluoroethenyl)oxy)-methyl)-1,2,2,2,-tetrafluoroethoxy)-2,2,3,3,-tetrafluoropropane nitrile (8-CNVE);
• and 1,1,2,2-tetrafluoro-2-((1,1,1,2,3,3-hexafluoro-3-((1,2,2-trifluorovinyl)oxy) propan-2-yl)oxy)ethane-1-sulfonyl azide (8-SAVE);
• and
• d) reacting the perfluorotrivinyltriazine monomer of formula (1) with the one or more cure site monomers and with the one or more other comonomers to obtain the cross-linked fluoroelastomer.