Degradable polystyrene and preparation method thereof

A technology of polystyrene and general formula, which is applied in the field of degradable polystyrene and its preparation, can solve the problems of low number of blocks and easy occurrence of side reactions, achieve low carbonyl content, realize industrial application, and have good melt fluidity Effect

Active Publication Date: 2021-08-31
衡水佰科高分子材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires end group transformation of the polymer, which is prone to side reactions, resulting in a low number of blocks (DB<10) to obtain the target polymer.
[0011] As mentioned above, the methods of introducing degradable groups into polymers in the prior art have their own shortcomings and limitations

Method used

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  • Degradable polystyrene and preparation method thereof
  • Degradable polystyrene and preparation method thereof
  • Degradable polystyrene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: Preparation of P1

[0037] The preparation route is as follows:

[0038]

[0039] Among them, m and n represent: the repeating number of structural units in the polystyrene segment, wherein, n is determined by the ratio of the initiator to the monomer; m is determined by the ratio of azodicyanovaleric acid and p-dibromobenzyl .

[0040] Concrete preparation steps are as follows:

[0041](1) Synthesis of p-dibromobenzyl: sodium bromide (4.115g, 0.04mol), sodium bromate (3.018g, 0.02mol) was added to 70ml water; p-xylene (3.185g, 0.03mol) was added to In 70ml of dichloromethane; add sulfuric acid (2.94g, 0.03mol) to 40ml of water. The first two solutions are mixed, and the dilute sulfuric acid solution is added dropwise to the mixed solution, and the dropping rate is controlled at a drop rate of about 3 seconds, and the reaction is performed at room temperature for about 6 hours. After the reaction was completed, the product was washed with water thre...

Embodiment 2

[0044] Embodiment 2: the preparation of P2

[0045] The specific preparation steps are as follows: The specific preparation steps are as follows: the same part as in Example 1 will not be repeated, and the difference from Example 1 is that the molar ratio of the macroinitiator to the monomer styrene is 1:300.

Embodiment 3

[0046] Embodiment 3: the preparation of P3

[0047] The specific preparation steps are as follows: the same part as in Example 1 will not be repeated, and the difference from Example 1 is that the molar ratio of the macroinitiator to the monomer is 1:500.

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Abstract

The invention discloses a degradable polystyrene having a structure represented by general formula I and a preparation method thereof, comprising the following steps: (1) adding a dihalide, a dicarboxylic acid initiator and an organic base into a solvent, and reacting at room temperature Finally, obtain a macromolecular initiator solution; (2) under an inert atmosphere, mix the macromolecular initiator solution obtained in step (1) with styrene monomer and react at 75° C. to obtain ester-based multi-block polystyrene solution; (3) adding the solution in step (2) dropwise to the poor solvent, filtering, washing, and drying to obtain the target polymer.

Description

technical field [0001] The invention relates to polystyrene and a preparation method thereof, in particular to degradable polystyrene and a preparation method thereof. Background technique [0002] As a general-purpose polymer material, polystyrene and its copolymers are widely used in electronic appliances, fast food lunch boxes, packaging materials, building boards, etc. products. Since polystyrene is difficult to degrade under natural conditions, its waste will cause serious pollution to the environment (Pan Zuren, Polymer Chemistry, 2007). [0003] There are two main types of degradable polymer materials, namely blending type and synthetic type. [0004] Blended polymer materials mainly include two types. One is to blend synthetic polymer materials such as polystyrene with natural polymers such as starch, cellulose, and chitosan (Journal of Wuhan University, 2000, 46, 449). Although natural polymers will be degraded under natural conditions, polystyrene will remain i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F112/08C08G63/685C08G63/78
CPCC08F112/08C08G63/685C08G63/78
Inventor 王泽卉汪太生沈飞宇相春旭凌乾竣费韦多
Owner 衡水佰科高分子材料有限责任公司
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