A kind of controllable preparation method of conjugated diene and polar olefin monomer copolymer
A conjugated diene and polar olefin technology, which is applied in the field of controllable preparation of conjugated diene and polar olefin monomer copolymers, can solve the problems of complex process, wide molecular weight distribution, difficult control, etc. Simple, narrow molecular weight distribution, high molecular weight effect
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Embodiment 1
[0027] Embodiment 1: The controllable preparation method of a conjugated diene and polar olefin monomer copolymer of the present embodiment is carried out according to the following steps:
[0028] Under argon atmosphere, in a 50mL reaction flask, add azobisisobutyronitrile (AIBN, 3.7mg, 23μmol, 1equiv.), 2.2mL of toluene solution, and then add methyl acrylate (2.1mL, 23mmol, 1000equiv. ) and isoprene (2.3 mL, 23 mmol, 1000 equiv.) to form a homogeneous solution, which was polymerized at 70 °C for 24 h, quenched with cold methanol, the polymer was precipitated, washed twice with methanol, and dried in vacuo to constant weight, A colloidal polymer, ie a copolymer of conjugated diene and polar olefin monomers, is obtained.
[0029] Result: Yield 71%. The NMR characterization showed that the 1,4-selectivity content of the polyisoprene segment was 96%, and the 3,4-selectivity content was 4%. The polar monomer methyl acrylate content is 39%; characterized by GPC: M n It was 5103...
Embodiment 2
[0032] Embodiment 2: The controllable preparation method of a conjugated diene and polar olefin monomer copolymer of the present embodiment is carried out according to the following steps:
[0033] Under argon atmosphere, in a 50mL reaction flask, add azobisisobutyronitrile (AIBN, 3.7mg, 23μmol, 1equiv.), 4.4mL of toluene solution, and then add methyl acrylate (2.1mL, 23mmol, 1000equiv. ) and isoprene (2.3 mL, 23 mmol, 1000 equiv.) to form a homogeneous solution, which was polymerized at 70 °C for 24 h, quenched with cold methanol, the polymer was precipitated, washed twice with methanol, and dried in vacuo to constant weight, A colloidal polymer, ie a copolymer of conjugated diene and polar olefin monomers, is obtained.
[0034] Result: The yield was 62%. The NMR characterization showed that the 1,4-selectivity content of the polyisoprene segment was 96%, and the 3,4-selectivity content was 4%. The polar monomer methyl acrylate content is 38%; characterized by GPC: M n It ...
Embodiment 3
[0035] Embodiment 3: The controllable preparation method of a conjugated diene and polar olefin monomer copolymer of the present embodiment is carried out according to the following steps:
[0036] Under argon atmosphere, in a 50mL reaction flask, add azobisisobutyronitrile (AIBN, 3.7mg, 23μmol, 1equiv.), 22mL of toluene solution, and then add methyl acrylate (2.1mL, 23mmol, 1000equiv.) and isoprene (2.3 mL, 23 mmol, 1000 equiv.) to form a homogeneous solution, which was polymerized at 70 °C for 24 h, quenched with cold methanol to precipitate a polymer, washed twice with methanol, and dried in vacuo to constant weight to obtain Gum-like polymers, ie, copolymers of conjugated dienes and polar olefin monomers.
[0037] Result: Yield 53%. The NMR characterization showed that the 1,4-selectivity content of the polyisoprene segment was 95%, and the 3,4-selectivity content was 5%. The polar monomer methyl acrylate content is 38%; characterized by GPC: M n It was 19820 g / mol, and...
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