Composition and method for producing fuel resistant liquid polythioether polymers with good low temperature flexibility

Polysulfide, including I structure:-R1-[-S-(CH2) 2-O-[-R2-O-]m-(CH2) 2-S-R1-]n-I, R1 says C2-6 Chong-alkyl, alkylidene group of C3-6, C6-8 alkyl alkyl or alkyl C6-10 Asia Central Asia Central, or-[(-CH2-) p-X-]q-(-CH2-) r-, of which at least one unit of-CH2-with methyl substituent ; R2 said C2-6 of are Asia alkyl, C2-6 support of Asia alkyl, C6-8 of Asia ring alkyl or C6-10 of alkyl Asia ring alkyl, or-[(-CH2-) p-X-]q-(-CH2-) r-;X said selected since O,S and-NR6-one of of group; R6 said hydrogen or methyl; m is 0~10 of rational number; n is 1~60 of integer; p is 2~6 of integer; q is 1~5 of integer; r is 2~10 of integer. The poly-sulfide in the indoor temperature and liquid under pressure.