Thermoplastic copolyester composition with thermally reversible chemical crosslinking properties and preparation method and application thereof
A thermoplastic copolyester and chemical crosslinking technology, which is applied to thermoplastic copolyester compositions with thermally reversible chemical crosslinking properties and their preparation and application fields, can solve the problem of affecting the secondary processing and utilization of polymer recycling and restricting applications. It can achieve the effect of excellent thermo-mechanical properties, favorable material properties, and commercialization.
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Embodiment 1
[0075] Embodiment 1: the preparation of PBASf-BMI composition
[0076] (1) In a 250mL flask, add adipic acid (0.5mol, 73g), 1,4-butanediol (1.0mol, 90.1g), functional monomer DMF-FM containing 2-furfurylsulfanyl side group (the amount is 5mol%, 10mol%, 15mol%, 20mol% of the total acid feed) and n-butyl titanate (the amount is 0.2mol% of the total acid), the alkyd ratio is 2, and the reaction 6- After 7 hours, an esterified product was obtained with an esterification rate of 98%; n-butyl titanate was added to the esterified product (the amount used was 0.1 mol% of the total acid), and the melt polycondensation reaction was carried out at 190-220°C and about 100Pa. -6 hours, the copolyester PBASf having 2-furfurylthio side groups was prepared.
[0077] (2) A mold for mixing the copolyester PBASf prepared in step (1) and bismaleimide (the molar ratio of furan and maleimide groups is 1:1.1 to 1.1:1) The method of thermocompression molding, prepares the thermoplastic copolyester ...
Embodiment 2
[0081] Embodiment 2: the preparation of PBSf-BMI composition
[0082] (1) In a 250mL flask, add succinic acid (0.5mol, 59g), 1,4-butanediol (1.0mol, 90.1g), functional monomer DMF-FM containing 2-furfurylsulfanyl side group (the amount is 5mol%, 10mol%, 15mol%, 20mol% of the total acid feed) and n-butyl titanate (the amount is 0.2mol% of the total acid), the alkyd ratio is 2, and the reaction 3- 6h, the esterification product was obtained, and the esterification rate reached 98%; n-butyl titanate was added to the esterification product (the amount used was 0.1mol% of the total acid), and the melt polycondensation reaction was carried out at 190-220°C and about 100Pa. -6 hours, the copolyester PBSf having 2-furfurylthio side groups was prepared.
[0083] (2) Mix the copolyester PBSf prepared in step (1) with bismaleimide BMI (the molar ratio of furan and maleimide groups is 1:1.1~1.1:1) A thermoplastic copolyester composition PBSf-BMI with thermally reversible crosslinking pr...
Embodiment 3
[0084] Embodiment 3: the preparation of PBSASf-BMI composition
[0085] (1) Add succinic acid (0.25mol, 59g), adipic acid (0.25mol, 36.5g) 1,4-butanediol (1.0mol, 90.1g) and 2-furfurylsulfanyl in a 250mL flask The functional monomer DMF-FM of the side group (the amount is 5mol%, 10mol%, 15mol%, 20mol% of the total acid feed) and n-butyl titanate (the amount is 0.2mol% of the total acid), the alkyd ratio is 2 , react at 160-190°C for 4-7h to obtain an esterified product with an esterification rate of 98%; add n-butyl titanate (0.1mol% of total acid) to the esterified product, The melt polycondensation reaction is carried out under the conditions of ℃ and about 100 Pa for 4-6 hours, and the copolyester PBSASf with 2-furfurylsulfanyl side groups is prepared.
[0086] (2) Mix the copolyester PBSASf prepared in step (1) with bismaleimide (the molar ratio of furan and maleimide groups is 1:1.1 to 1.1:1) with a mold A thermoplastic copolyester composition PBSASf-BMI with thermoreve...
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