US 12,359,008 B2
Alternating copolymers of selected unsymmetrically substituted stilbenes and maleic anhydride or N-substituted maleimides
Sam Richard Turner, Blacksburg, VA (US); Richard David Gandour, Blacksburg, VA (US); Chanelle J. Brown, Blacksburg, VA (US); Anna Steele, Blacksburg, VA (US); and John B. Matson, Blacksburg, VA (US)
Assigned to VIRGINIA TECH INTELLECTUAL PROPERTIES, INC., Blacksburg, VA (US)
Filed by VIRGINIA TECH INTELLECTUAL PROPERTIES, INC., Blacksburg, VA (US)
Filed on Sep. 19, 2022, as Appl. No. 17/947,803.
Claims priority of provisional application 63/245,230, filed on Sep. 17, 2021.
Prior Publication US 2023/0089076 A1, Mar. 23, 2023
Int. Cl. C08F 222/08 (2006.01); C08F 2/08 (2006.01); C08F 212/32 (2006.01); C08F 12/32 (2006.01); C08F 22/06 (2006.01); C08F 222/06 (2006.01)
CPC C08F 222/08 (2013.01) [C08F 2/08 (2013.01); C08F 212/32 (2013.01); C08F 12/32 (2013.01); C08F 22/06 (2013.01); C08F 222/06 (2013.01)] 8 Claims
 
1. A method of preparing an alternating copolymer having repeat units according to formula (I):

OG Complex Work Unit Chemistry
wherein X is OCH3 and Y is selected from the group consisting of C1-C5 alkyl, C1-C5 haloalkyl, halogen, cyano, C(O) C1-C5 alkyl, C(O)OC1-C5 alkyl, amino, NH(C1-C5 alkyl), N(C1-C5 alkyl)2, O(C2-C5 alkyl), and 1H-tetrazole, wherein each alkyl is independently selected; and wherein X and Y are simultaneously not the same, and wherein A and B are single bonds; the method comprising admixing a disubstituted stilbene of formula (II):

OG Complex Work Unit Chemistry
with maleic anhydride, in a polymerization solvent, in the presence of a radical initiator, wherein the alternating copolymer of formula (I) is substantially homogeneously distributed in the polymerization solvent in which the alternating copolymer was prepared to produce an admixture with an absolute viscosity from about 0.1 to 200 centipoises (cP) at 300° K.