A method for cross-linking modification of aliphatic polycarbonate

A polycarbonate, cross-linking modification technology, applied in the direction of chemical instruments and methods, other chemical processes, etc., can solve the problem of changing the flexibility of the main chain of aliphatic polycarbonate, the difficulty of controlling the degree of polycarbonate cross-linking, and the existence of safety hazards and other problems, to achieve good application prospects, low cost of raw materials, high yield effect

Inactive Publication Date: 2019-01-15
NORTHWEST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as physical blending, ternary copolymerization, cross-linking modification reaction, etc., but physical blending cannot fundamentally change the flexibility of the main chain of aliphatic polycarbonate, and it is prone to phase separation
Terpolymerization relies on monomer and catalyst activity, increasing cost
Although the thermal and mechanical properties of the polycarbonate prepared by this method are improved, the reaction conditions need to be carried out under high pressure conditions, which has potential safety hazards, and the degree of crosslinking of the obtained polycarbonate is difficult to control
So far, there is no report on the one-pot synthesis of aliphatic polycarbonate by using aliphatic diol, dimethyl carbonate as a polymerized monomer, and introducing a crosslinking agent 1,3,5-benzenetrimethanol

Method used

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  • A method for cross-linking modification of aliphatic polycarbonate
  • A method for cross-linking modification of aliphatic polycarbonate
  • A method for cross-linking modification of aliphatic polycarbonate

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Embodiment 1

[0022] A method for cross-linking modification of aliphatic polycarbonate, is characterized in that, comprises the following steps:

[0023] 1,4-butanediol (273mg, 3mmol), dimethyl carbonate (290mg, 10mmol), 1,3,5-benzenetrimethanol (168mg, 1mmol) and sodium methoxide (2.701mg, 0.05mmol) were added to 50ml Fill the polymerization tube with nitrogen gas and polymerize in two steps. The first step is at 120°C for 9 hours; the second step is at 210°C for 6 hours at 10KPa; acetic acid and chloroform are washed in sequence and vacuum-dried to obtain crosslinking Type aliphatic carbonate 0.80g. The swelling rate is 1190%.

Embodiment 2

[0025] A method for cross-linking modification of aliphatic polycarbonate, is characterized in that, comprises the following steps:

[0026] 1,4-pentanediol (273mg, 3mmol), dimethyl carbonate (290mg, 10mmol), 1,3,5-benzenetrimethanol (84mg, 0.5mmol) and sodium methoxide (2.701mg, 0.05mmol) were added to Fill a 50ml polymerization tube with nitrogen gas and polymerize in two steps. The first step is at 120°C for 9h; the second step is at 190°C for 6h at 10KPa; the acetic acid and chloroform are washed in sequence and vacuum-dried to obtain cross-linked Joint type aliphatic carbonate 0.75 g; swelling rate 1429%.

Embodiment 3

[0028] A method for cross-linking modification of aliphatic polycarbonate, is characterized in that, comprises the following steps:

[0029] 1,5-hexanediol (273mg, 3mmol), dimethyl carbonate (290mg, 10mmol), 1,3,5-benzenetrimethanol (84mg, 0.50mmol) and sodium methoxide (2.701mg, 0.05mmol) were added to Fill a 50ml polymerization tube with nitrogen gas and polymerize in two steps. The first step is at 120°C for 9 hours; the second step is at 170°C for 6 hours at 10KPa. Acetic acid and chloroform were washed successively, and vacuum-dried to obtain 0.69 g of a cross-linked aliphatic carbonate. The swelling rate was 629%.

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Abstract

A method for cross-linking modification of aliphatic polycarbonate, including the following steps: using aliphatic diol and dimethyl carbonate DMC as polymerization monomers under the action of a catalyst, introducing a cross-linking agent 1,3,5-benzene Trimethanol BTM is obtained through one-pot polymerization; the cross-linked aliphatic carbonate prepared by the invention has good thermal properties and swelling properties, and has good application prospects in the field of environmental pollution treatment; the cross-linking process in the polymerization reaction is changed The addition amount and polymerization conditions of the agent 1,3,5-benzenetrimethanol can effectively control the cross-linking degree and performance of aliphatic polycarbonate to meet the needs of different uses.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a method for crosslinking and modifying aliphatic polycarbonate. Background technique [0002] Aliphatic polycarbonate is a new type of biodegradable material, which is mainly obtained by copolymerization of aliphatic diol and dimethyl carbonate. Due to its biocompatible, translucent and non-toxic properties, it is mainly used in the field of pharmaceutical packaging , It can also be used as a degradable plastic, and it is also an important raw material for the preparation of polyurethane waterproof coatings. However, the application of aliphatic polycarbonates has been limited by poor thermal and mechanical properties. Therefore, many methods have been developed to improve the thermal and mechanical properties of aliphatic polycarbonates to facilitate their large-scale production and applications. For example, physical blending, ternary copolymerization, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/30C08G64/42B01J20/26
CPCB01J20/262B01J20/267C08G64/305C08G64/42
Inventor 贾立吕兴强刘江周瑞
Owner NORTHWEST UNIV
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