A kind of polyester block copolymer and preparation method thereof
A polyester block and copolymer technology, applied in the field of polymers, can solve the problems of imperfect preparation methods of polyester block copolymers, poor chain extension efficiency, and low molecular weight of polyester
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Embodiment 1
[0033] Take a dry and clean 25ml thick-walled pressure-resistant reaction tube under argon atmosphere, add 5mmol exo-norbornene dianhydride, 0.1mmol bis-(triphenylphosphoryl)ammonium chloride, 5mmol epoxycyclohexane, 1ml Dissolve in toluene (the amount of solvent can dissolve quaternary ammonium salt compounds, epoxy compounds, acid anhydrides, etc.), react at 110°C for 1 hour; then add 5 mmol of internal norbornene diacid anhydride, 5 mmol of epoxy ring A mixed solution of hexane and 1ml of toluene (the amount of toluene can dissolve quaternary ammonium compounds, epoxy compounds, acid anhydrides, etc.), after reacting at 110°C for 4 hours, pour the reaction system into methanol with a volume of 50ml to settle , filtered, washed, and the resulting product was vacuum-dried at 45°C for 24h to obtain R 1 , R 3 For 2,3 substituted norbornene; R 2 , R 4 It is a polyester block copolymer with 1,2 substituted cyclohexane.
[0034] Among them, the m value is 15, and the n value i...
Embodiment 2
[0037] All the other operations are the same as in Example 1, and the difference is that in the step a) the acid anhydride is 5mmol external norbornene dioic anhydride, and the epoxy compound is 5mmol epoxycyclohexane; in the step b), the acid anhydride is 5mmol succinic anhydride, the epoxy compound It is 5mmol epoxycyclohexane. get R 1 It is the exo-norbornene substituted at the 2 and 3 positions, R 3 is hydrogen; R 2 , R 4 It is a polyester block copolymer of 1,2-substituted cyclohexane. The yield is 84%, the average molecular weight measured by GPC is 7050, the m value is 13, the n value is 18, and the molecular weight distribution is 1.6.
Embodiment 3
[0039] All the other operations are the same as in Example 1, and the difference is that the acid anhydride in the step a) is 5mmol external norbornene dioic anhydride, and the epoxy compound is 5mmol epoxycyclohexane; the acid anhydride is 5mmol3-oxabicyclo[ in the step b). 3.1.0] Hexane-2,4-dione, epoxy compound is 5 mmol of cyclohexane oxide. get R 1 It is the exo-norbornene substituted at the 2 and 3 positions, R 3 For 1,2-substituted cyclopropane; R 2 , R 4 It is a polyester block copolymer of 1,2-substituted cyclohexane. The yield is 85%, the average molecular weight measured by GPC is 5775, the m value is 11, the n value is 14, and the molecular weight distribution is 1.5.
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