Crosslinkable and crosslinked polymers
View Patent ↗Crosslinkable polymeric materials are disclosed useful for the temporal stabilization of a poling-induced noncentrosymmetric host lattice containing guest nonlinear optical chromophores. The materials are also suitable as crosslinkable coatings in the absence of chromophores. Also disclosed is a method of crosslinking such polymeric material.
1. A method for crosslinking a polymer, comprising:
reacting i) a crosslinkable polymeric material comprising olefin groups and ii) a crosslinking agent comprising electron deficient olefin groups, and wherein the crosslinking agent comprises at least two maleimide groups linked via the nitrogen atom to a C 1 -C 30 hydrocarbylene group; that reacts with the crosslinkable polymeric material via an ene reaction, a Diels Alder reaction, or a combination of an ene reaction and a Diels Alder reaction, at a temperature at which crosslinking occurs.
2. The method of claim 1 , wherein the crosslinkable polymeric material is polyamide, polyimide, polyetherimide, polyethylene sulfone, polyether sulfone, polyethylene ether, polyethylene ketone, polyester, polyacrylate, polyurethane, epoxide polymer, polyether, polycarbonate, or a combination of the foregoing.
3. The method of claim 2 , wherein the polycarbonate is a copolymer of a bisphenol compound comprising two olefin groups and a 4,4′-[1-methyl-4-(1-methylethyl)-1,3-cyclohexandiyl]bisphenol.
4. The method of claim 3 , wherein the bisphenol is 2,2′-diallylbisphenol A.
5. The method of claim 1 , wherein the crosslinking agent is 1,1′-(methylenedi-4,1-phenylene)bismalimide; 1,4-phenylene bismalimide; 1,4-(di-1H-pyffole-2,5-dione)butane; or a combination thereof.
6. The reaction product formed according to the method of claim 1 .
7. A method for cros slinking a polymer, comprising:
reacting i) a polycarbonate copolymer prepared from a bisphenol compound comprising two olefin groups and a 4,4′-[1-methyl-4-(1-methylethyl)- 1,3-cyclohexandiyl]bisphenol and ii) 1,1′-(methylenedi-4,1-phenylene)bismalimide, 1,4-(phenylene bismalimide, 1,4-di-1H-pyrrole-2,5-dione)butane, or a combination thereof, that reacts via an ene reaction, a Diels Alder reaction, or a combination of an ene reaction and a Diels Alder reaction, at a temperature at which crosslinking occurs.
8. The reaction product formed according to the method of claim 7 .