A polythioether comprising: (a) a backbone comprising a structure having the formula: -R 1 -[-S-(CH 2) 2 -O-[-R 2 -O-] m -(CH 2) 2 -S-R 1] n - wherein: (i) each R 1 is independently selected from a C 2-10 n-alkylene group, a C 2-6 branched alkylene group, a C 6-8 cycloalkylene group, a C 6-10 alkylcycloalkylene group, a heterocyclic group, a -[(-CH 2 -) p -X-] q -(CH 2) r - group, and a -[(-CH 2 -) p -X-] q -(CH 2) r - group in which at least one -CH 2 - unit is substituted with a methyl group; (ii) each R 2 is independently selected from a C 2-10 n-alkylene group, a C 2-6 branched alkylene group, a C 6-8 cycloalkylene group, a C 6-14 alkylcycloalkylene group, a heterocyclic group, and a -[(-CH 2 -) p -X-] q -(CH 2) r - group; (iii) each X is independently selected from O, S, and a -NR 6 - group, in which R 6 is selected from H and a methyl group; (iv) m ranges from 0 to 50; (v) n is an integer ranging from 1 to 60; (vi) p is an integer ranging from 2 to 6; (vii) q is an integer ranging from 1 to 5; and (viii) r is an integer ranging from 2 to 10; and (b) at least two groups, per molecule, having the formula: wherein R 3, R 4, and R 5 are each independently selected from a C 1-6 n-alkyl group, a C 1-6 branched alkyl group, a substituted C 1-6 n-alkyl group, and a phenyl group. (a) a backbone comprising a structure having the formula: -R 1 -[-S-(CH 2) 2 -O-[-R 2 -O-] m -(CH 2) 2 -S-R 1] n - wherein: (i) each R 1 is independently selected from a C 2-10 n-alkylene group, a C 2-6 branched alkylene group, a C 6-8 cycloalkylene group, a C 6-10 alkylcycloalkylene group, a heterocyclic group, a -[(-CH 2 -) p -X-] q -(CH 2) r - group, and a -[(-CH 2 -) p -X-] q -(CH 2) r - group in which at least one -CH 2 - unit is substituted with a methyl group; (ii) each R 2 is independently selected from a C 2-10 n-alkylene group, a C 2-6 branched alkylene group, a C 6-8 cycloalkylene group, a C 6-14 alkylcycloalkylene group, a heterocyclic group, and a -[(-CH 2 -) p -X-] q -(CH 2) r - group; (iii) each X is independently selected from O, S, and a -NR 6 - group, in which R 6 is selected from H and a methyl group; (iv) m ranges from 0 to 50; (v) n is an integer ranging from 1 to 60; (vi) p is an integer ranging from 2 to 6; (vii) q is an integer ranging from 1 to 5; and (viii) r is an integer ranging from 2 to 10; and (i) each R 1 is independently selected from a C 2-10 n-alkylene group, a C 2-6 branched alkylene group, a C 6-8 cycloalkylene group, a C 6-10 alkylcycloalkylene group, a heterocyclic group, a -[(-CH 2 -) p -X-] q -(CH 2) r - group, and a -[(-CH 2 -) p -X-] q -(CH 2) r - group in which at least one -CH 2 - unit is substituted with a methyl group; (ii) each R 2 is independently selected from a C 2-10 n-alkylene group, a C 2-6 branched alkylene group, a C 6-8 cycloalkylene group, a C 6-14 alkylcycloalkylene group, a heterocyclic group, and a -[(-CH 2 -) p -X-] q -(CH 2) r - group; (iii) each X is independently selected from O, S, and a -NR 6 - group, in which R 6 is selected from H and a methyl group; (iv) m ranges from 0 to 50; (v) n is an integer ranging from 1 to 60; (vi) p is an integer ranging from 2 to 6; (vii) q is an integer ranging from 1 to 5; and (viii) r is an integer ranging from 2 to 10; and (b) at least two groups, per molecule, having the formula: wherein R 3, R 4, and R 5 are each independently selected from a C 1-6 n-alkyl group, a C 1-6 branched alkyl group, a substituted C 1-6 n-alkyl group, and a phenyl group.