Method for producing aba-triblock copolymers with a bimodal b-block
A technology of block copolymers and copolymers, applied in coatings, adhesives, etc.
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Embodiment 1
[0070] in N 2 Add monomer 1a (accurate name and consumption data in Table 1), 120ml propyl acetate, copper oxide in advance to the jacketed vessel equipped with stirrer, thermometer, reflux condenser, nitrogen gas introduction tube and dropping funnel under atmosphere (I) (see Table 1 for consumption) and N, N, N', N", N "-pentamethyldiethylenetriamine (PMDETA, see Table 1 for consumption). The solution was stirred at 80°C for 15 minutes. Subsequently, at the same temperature, a certain amount of Initiator 1 (see Table 1), 1,4-butanediol bis(2-bromo-2-methylpropionate) (BDBIB, in 10 ml of propyl acetate) was added ). After a reaction time of two hours, an amount of Initiator 2 (see Table 1), 1,4-butanediol bis(2-bromo-2-methylpropionate) (BDBIB, in 10 ml propyl acetate ) was added to the reaction solution. After a further 1.5 hours of polymerization time, samples were taken for determination of the average molecular weight M n (using SEC) and a mixture of monomer 2a and m...
Embodiment 2
[0072] Analogously to Example 1, monomers 1b, 2b and 3b were used (exact names and amount data are in Table 1).
Embodiment 3
[0074] Analogously to Example 1, monomers 1c, 2c and 3c were used (exact names and amount data are in Table 1). In the initial charge, 180 g of propyl acetate were used.
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