New synthesis of liquid polysulfide polymers in the presence of hydrazine. II. The synthesis of linear polymers from 1,1′-[methylenebis(oxy)]-bis-[2-chloroethane] and Na2S3 or Na2S2.5

✍ Scribed by Mirjana E. Tenc-Popovic; Ljubinka J. Bogunovic; Marina R. Krivokuca

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 98 KB
• Volume: 35
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(199706)35:8<1369::aid-pola4>3.0.co;2-v

✦ Synopsis

Liquid polysulfide polymers with the thiol groups on the end of the chains and of the average molecular weight of 7000-510 g mol 01 have been obtained by the reaction of BClE and Na 2 S 3 , i.e., Na 2 S 2.5 in the presence of hydrazine. The average molecular weight of the obtained polymers depends on the quantity of hydrazine used for the syntheses. With the aim to obtain polymers of the similar average molecular weight it is necessary to use on average 0.5 mol of hydrazine per polymer segment less if Na 2 S 2.5 is used instead of Na 2 S 3 . The sulfur content in the obtained polymers is on average less than 2 sulfur atoms per polymer segment and amounts to 1.90 sulfur atoms when Na 2 S 3 is used and is 1.76 sulfur atoms per polymer segment when Na 2 S 2.5 is used for the synthesis.