Sulfone-containing polythioethers, compositions thereof, and methods of synthesis

摘要

Sulfone-containing polythioethers, compositions containing sulfone-containing polythioethers, methods of synthesizing sulfone-containing polythioethers and the use of sulfone-containing polythioethers in aerospace sealant applications are disclosed. The sulfone-containing polythioethers have sulfone groups incorporated into the backbone of the polythioether. Cured sealant compositions comprising the sulfone-containing polythioethers exhibit enhanced thermal resistance.

主权项

1. A sulfone-containing polythioether comprising a moiety of Formula (1):
-A-CH2—CH2—S(O)2—CH2—CH2-A-  (1)wherein
each A is independently a moiety of Formula (2):
—S—R1—[—S—(CH2)p—O—(R2—O)m—(CH2)2—S—R1—]n—S—  (2)wherein:
each R1 independently comprises C2-10 alkanediyl, C6-8 cycloalkanediyl, C6-10 alkanecycloalkanediyl, C5-8 heterocycloalkanediyl, or -[(—CHR3—)s—X—]q—(—CHR3—)r—, wherein:
s is an integer from 2 to 6;q is an integer from 1 to 5;r is an integer from 2 to 10;each R3 independently comprises hydrogen or methyl; andeach X independently comprises —O—, —S—, and —NR5—, wherein R5 comprises hydrogen or methyl; andeach R2 independently comprises C1-10 alkanediyl, C6-8 cycloalkanediyl, C6-14 alkanecycloalkanediyl, or -[(—CHR3—)s—X—]q—(—CHR3—)r—, wherein s, q, r, R3, and X are as defined for R1;m is an integer from 0 to 50;n is an integer from 1 to 60; andp is an integer from 2 to 6.