A method for reducing polymer molecular weight
A polymer and molecular weight technology, applied in the field of reducing the molecular weight of polymers, to achieve good selectivity
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Embodiment 1
[0029] Dissolve 1 gram of butadiene-styrene rubber (commercially purchased from Sinopec, the brand is 2305, the butadiene-styrene rubber uses tin tetrachloride as coupling agent) in 10 mL of n-hexane, after the dissolution is complete , to which 0.005 g FeCl was added 2 , while adding 0.002 g of elemental iodine to the solution, the reaction solution was heated to 60° C., and reacted for 4 hours. The resulting mixture was dried under reduced pressure in a vacuum oven to remove the solvent to obtain the product. Table 1 lists the molecular weights of butadiene-styrene rubbers used as raw materials and the products obtained and their distributions.
Embodiment 2
[0035] The reaction was carried out in the same manner as in Example 1, except that the reaction time was 8 hours. The molecular weights of the obtained products and their distributions are listed in Table 1.
[0036] Table 1
[0037] serial number base polymer Example 1 Comparative example 1 Comparative example 2 Example 2 M n 1 （×10 4 ）
12.3 12.4 12.3 12.5 12.1 MWD 1
1.03 1.02 1.04 1.02 1.03 *A 1 （%）
42.6 59.8 46.3 45.2 61.4 M n 2 （×10 4 ）
24.2 24.5 24.0 24.6 24.1 MWD 2
1.01 1.02 1.03 1.04 1.02 **A 2 （%）
15.2 17.8 16.1 15.4 18.0 M n 3 （×10 4 ）
41.2 41.5 41.1 41.2 41.5 MWD 3
1.06 1.05 1.03 1.03 1.04 ***A 3 （%）
42.2 22.4 37.6 39.4 20.6
[0038] *A 1 =[m 1 / (m 1 +m 2 +m 3 )]×100%; **A 2 =[m 2 / (m 1 +m 2 +m 3 )]×100%;***A 3 =[m 3 / (m 1 +m 2 +m 3 )]×100%
[0039] m 1 The number average molecular weight is M n1 The peak area m 2 T...
Embodiment 3
[0042] 1 gram of butadiene-styrene rubber (same as Example 1) was dissolved in 10 mL of toluene, after the dissolution was complete, 0.01 gram of FeCl was added thereto 2 , the reaction temperature was controlled at 25°C, and 0.005 g of elemental iodine was added to the solution at the same time, and reacted for 6 hours. The resulting mixture was dried under reduced pressure in a vacuum oven to remove the solvent to obtain the product. The molecular weights of the obtained products and their distributions are listed in Table 2.
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