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A kind of preparation method of cross-linked aliphatic polycarbonate

A polycarbonate and aliphatic technology, applied in the field of polymer materials, can solve the problems of toxicity, non-compliance with environmental protection requirements of materials, and difficulty in controlling the degree of cross-linking of polycarbonate, and achieves low synthesis cost, low raw material cost, and polymerization product. high rate effect

Inactive Publication Date: 2015-10-07
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the mechanical properties and thermal stability of the polycarbonate prepared by this method can be improved, the polymerized monomer pyromellitic anhydride is toxic and does not meet the environmental protection requirements of materials, and the degree of crosslinking of the polycarbonate obtained is also difficult to control
So far, there is no report on the one-pot preparation of cross-linked aliphatic carbonate by introducing itaconic anhydride in the copolymerization reaction of carbon dioxide and epoxy compounds

Method used

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  • A kind of preparation method of cross-linked aliphatic polycarbonate
  • A kind of preparation method of cross-linked aliphatic polycarbonate

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Experimental program
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Effect test

Embodiment 1

[0028] Add 0.5g of zinc glutarate, 4.03g (0.036mol) of itaconic anhydride, and 50 mL (0.72mol) of propylene oxide into the pre-dried reaction kettle, fill it with carbon dioxide gas, adjust the pressure to 5.2MPa, 60°C The reaction was mechanically stirred for 40 hours. The reaction was terminated with a methanol solution containing 5% hydrochloric acid, washed with methanol, and vacuum-dried at 35°C to constant weight to obtain 50.0 g of cross-linked aliphatic polycarbonate. The gel content in the polymer is 34.7%, the thermal decomposition temperature is 250.4 ℃, the tensile strength is 12.5 MPa, and the elongation at break is 604.1%.

Embodiment 2

[0030]Add 0.5g of zinc glutarate, 1.61g (0.0144mol) of itaconic anhydride, and 50 mL (0.72mol) of propylene oxide into a pre-dried reactor, fill with carbon dioxide gas, adjust the pressure to 5.2MPa, and store at 70°C The reaction was mechanically stirred for 40 hours. The reaction was terminated with a methanol solution containing 5% hydrochloric acid, washed with methanol, and vacuum-dried at 35°C to constant weight to obtain 51.2 g of cross-linked aliphatic polycarbonate. The gel content in the polymer is 35.2%, the thermal decomposition temperature is 257.8°C, the tensile strength is 20.2 MPa, and the elongation at break is 596.7%.

Embodiment 3

[0032] Add 0.5g of zinc glutarate, 4.03g (0.036mol) of itaconic anhydride, and 50 mL (0.72mol) of propylene oxide into the pre-dried reaction kettle, fill it with carbon dioxide gas, adjust the pressure to 5.2MPa, and store at 70°C The reaction was mechanically stirred for 30 h, and the reaction was terminated with a methanol solution containing 5% hydrochloric acid, washed with methanol, and vacuum-dried at 35°C to constant weight to obtain 55.8 g of cross-linked aliphatic polycarbonate. The gel content in the polymer is 49.7%, the thermal decomposition temperature is 250.9°C, the tensile strength is 21.0MPa, and the elongation at break is 567.6%.

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Abstract

The invention provides a preparation method of crosslinking type aliphatic polycarbonate, and belongs to the technical field of high polymer materials. The crosslinking type aliphatic polycarbonate is prepared by using carbon dioxide, an epoxy compound and itaconic anhydride as terpolymers through one-pot polymerization. The crosslinking type aliphatic polycarbonate prepared by the method has good mechanical property, thermal property, degradation property and a very good application prospect in the fields such as biological medicines. Experiments prove that the crosslinking degree and the properties of the aliphatic polycarbonate can be effectively controlled by changing the addition amount of itaconic anhydride monomers in the polymerization reaction process or polymerization reaction conditions (temperature, time and pressure) so as to meet the requirements of different purposes.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a preparation method of aliphatic polycarbonate, in particular to a preparation method of cross-linked aliphatic polycarbonate. Background technique [0002] Carbon dioxide copolymer Aliphatic polycarbonate (APC) is a new type of biodegradable polymer material, which is mainly obtained by copolymerizing carbon dioxide and epoxy compounds. Carbon dioxide copolymer aliphatic polycarbonate has a wide range of applications in the fields of biomedicine and packaging materials, especially as a degradable plastic. However, due to the generally poor thermal, mechanical and biodegradable properties of APC, its further use is limited. Therefore, physical and chemical modification methods are used to improve the performance of APC to promote its large-scale production and application. The method of physically modifying APC is mainly through filling and blending, but physical blend...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/34
Inventor 宋鹏飞毛旭东张雪峰朱晓岗纪小青刘小军
Owner NORTHWEST NORMAL UNIVERSITY
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