Diisocyanate Dithiol

SO adjusted as to permit the polymerization of a diisocyanate with a glycol or a diamine to be included as a condensation type. A superficially similar polymerization is exemplified by the condensation of a dithiol with a diolefin (preferably nonconjugated), e.g. ... 

Polymers containing units (114) can be prepared by step-growth polymerization of diisocyanates with dithiols or bischlorothioformates with diamines. Early reports on the synthesis of these polymers concerned the melt polymerization of decamethylene diisocyanate [4538-39-0] and 1,10-decanedithiol [1191-67-9] (285,286). 

Later, both the methods have been studied and compared, the addition reaction of various diisocyanates and dithiols carried out in chlorobenzene/o-dichlorobenzene solution with tri- -propylamine [102-69-2] and DABCO (1,4-diazabicyklo[2.2.2.]octane, triethylene diamine, 2,2 -diazabicyclo[2.2.2]octane, TED, BACO) [280-57-9] as catalyst (eq. 5) and interfacial condensation of... 

The SH- and NCO-terminated linear thiourethane telechelics containing units (114) (Mn = 520-610) were synthesized hy DABCO-catalyzed addition reaction of 3,6-dioxaoctane-l,8-dithiol [14970-87-7] with various diisocyanates, including HDI, the mixture of 2,4,4-trimethylhexamethylene diisocyanate [15646-96-5] and 2,2,4-trimethylhexamethylene diisocyanate [6938-22-0], and isophorone diisocyanate [4098-71-9]. It has been shown that NCO-terminated prepol5uners can he transformed into telechelics with olefinic end groups by treating with allyl alcohol [107-18-6], 2-hydroxyethyl methacrylate, or diallylamine [124-02-7] (288). 

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