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V-shaped gradient copolymer and preparation process thereof

A technology of gradient copolymers and copolymers, applied in the field of copolymers, achieves the effects of wide glass transition temperature, flexible synthesis methods, and excellent shape memory function

Inactive Publication Date: 2013-01-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gradient copolymers proposed in the past are limited to the transition from A-rich to B-rich in one direction; the V-shaped gradient from A-rich to B-rich and then to A-rich has rarely been reported.

Method used

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  • V-shaped gradient copolymer and preparation process thereof
  • V-shaped gradient copolymer and preparation process thereof
  • V-shaped gradient copolymer and preparation process thereof

Examples

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preparation example Construction

[0029] The preparation method of V-type gradient copolymer of the present invention comprises the following steps:

[0030] The first step: stirring and dissolving 0.69-3.45 parts by weight of the amphiphilic macromolecular reversible addition-fragmentation chain transfer reagent in 150 parts by weight of water to form a uniform water phase, and then adding 5-15 parts by weight of oil phase monomer A, After stirring into an emulsion, they are poured into the reactor together to keep stirring to keep uniform. The reactor was heated to 50-80° C., kept stirring, and nitrogen was passed through the reactor for deoxygenation for 30-60 minutes at the same time. Then add 0.0171~0.0855 parts by weight of water-soluble initiator, and after initiating polymerization for 30~35 minutes, gradually add 50 parts by weight of an aqueous solution containing 0.3~1.0 parts by weight of sodium hydroxide (in advance nitrogen bubbling and deoxygenation for 30~60 minutes). Continue the reaction for...

Embodiment 1

[0050] Example 1 : Copolymerization of styrene (St) and methyl acrylate (MA), molecular weight 9w.

[0051] The first step: 2.3 parts by weight of amphiphilic macromolecular RAFT was stirred and dissolved in 150 parts by weight of water to form a uniform water phase, and then 10 parts by weight of St was added, stirred into an emulsion, and then poured into the reactor to continue stirring to maintain evenly. The reactor was heated to 70°C and kept stirring while nitrogen was passed through the reactor to deoxygenate for 30 minutes. Then, 0.0285 parts by weight of potassium persulfate was added to the system, and 50 parts by weight of an aqueous solution of sodium hydroxide containing 0.6 parts by weight was gradually added after 35 minutes of polymerization (purging with nitrogen to deoxygenate for 30 minutes in advance). The reaction was continued for 40 minutes to complete the polymerization process of the first step.

[0052] Step 2: Add 10 weights each time according ...

Embodiment 2

[0055] Example 2 : Copolymerization of styrene (St) and methyl acrylate (MA), molecular weight 9w.

[0056] The first step: 2.3 parts by weight of amphiphilic macromolecular RAFT was stirred and dissolved in 150 parts by weight of water to form a uniform water phase, and then 10 parts by weight of St was added, stirred into an emulsion, and then poured into the reactor to continue stirring to maintain evenly. The reactor was heated to 70°C and kept stirring while nitrogen was passed through the reactor to deoxygenate for 30 minutes. Then, 0.0285 parts by weight of potassium persulfate was added to the system, and 50 parts by weight of an aqueous solution of sodium hydroxide containing 0.6 parts by weight was gradually added after 35 minutes of polymerization (purging with nitrogen to deoxygenate for 30 minutes in advance). The reaction was continued for 40 minutes to complete the polymerization process of the first step.

[0057] Step 2: Add 10 weights each time according ...

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Abstract

The invention discloses a V-shaped gradient copolymer and a preparation process thereof. According to the copolymer and the preparation process, an emulsion polymerization system is used, a reversible addition fragmentation chain transfer free radical polymerization technology is adopted, a series of gradient copolymers in a V-shaped molecular chain structure are prepared through a step-by-step sectional charging method, and the series of gradient copolymers can serve as multi-shaped memory materials. According to the copolymer and the preparation process, devices are simple, the course is environmentally friendly and energy-saving, raw materials are cheap and easy to obtain, and the unique gradient copolymer has a good multi-shaped memory function, can serve as a high polymer material with the excellent performance and has broad application prospects in fields such as biological medicine, aerospace and mechanics and electronics.

Description

technical field [0001] The invention relates to a copolymer, in particular to a gradient copolymer with a V-shaped molecular chain structure. Background technique [0002] Gradient copolymer is a new type of copolymer with unique structure and performance composed of two or more copolymerized units. Its molecular structure is characterized by the gradient change of the structural units that make up the polymer as the molecular chain extends. Different from the sudden change in the composition of the block copolymer at the connection point, the gradient copolymer is slow in the composition change of the entire molecular chain; and different from the random distribution of the composition of the random copolymer in the entire molecular chain, its composition Significant changes have taken place with the extension of the molecular chain. The unique molecular chain structure endows gradient copolymers with unique physical properties, such as thermodynamic properties, mechanica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08F212/08C08F220/14C08F220/18C08F2/38C08F2/22C08L53/00
Inventor 郭云龙高翔罗英武
Owner ZHEJIANG UNIV
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