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Shape memory polymer network formation system of controllable heat and light two-stage reaction and preparation method of shape memory polymer network formation system

A memory polymer, two-stage technology, applied in the field of shape memory materials, can solve the problems of shape memory polymer network formation system structure uncertainty, narrow application range, etc., to improve mechanical properties and service life, increase crosslinking density, Resolving effects with ambiguous structures

Active Publication Date: 2018-07-13
HARBIN INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of uncertain structure and narrow application range of the traditional shape memory polymer network formation system about the second-order reaction, and provide a sulfur-based solution with simple process, easy control of reaction conditions, and definite structure of reaction raw materials. Novel controllable heat and light two-stage reaction shape memory polymer network forming system of alcohol, epoxy resin and acrylic resin and its preparation method

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  • Shape memory polymer network formation system of controllable heat and light two-stage reaction and preparation method of shape memory polymer network formation system
  • Shape memory polymer network formation system of controllable heat and light two-stage reaction and preparation method of shape memory polymer network formation system

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specific Embodiment approach 1

[0018] Specific embodiment 1: This embodiment describes a shape memory polymer network forming system with controllable heat and light two-stage reaction, and the shape memory polymer network forming system is composed of 20-40% of thiol, 20-40% of epoxy resin, 20-55% of acrylic resin, 0.1-2% of catalyst and 0.5-4% of photoinitiator.

specific Embodiment approach 2

[0019] Specific embodiment two: a preparation method of the shape memory polymer network forming system with controllable heat and light two-stage reaction described in specific embodiment one, the method includes the following steps, such as figure 2 Shown:

[0020] Step 1: Fully mix mercaptan, epoxy resin, and photoinitiator at a temperature of 25~150°C;

[0021] Step 2: Add a catalyst with a mass of 0.1-2% of the mixture obtained in Step 1, mix evenly, and react at a temperature of 0-50°C for 0.2-5h to obtain a prepolymer;

[0022] Step 3: Add acrylic resin and a catalyst with 0.1-2% mass of acrylic resin to the prepolymer, mix evenly, and react at 0-100°C for 1-120 hours to obtain an intermediate polymer;

[0023] Step 4: Study the shape memory of the intermediate polymer obtained in Step 3: first determine the glass transition temperature of the intermediate polymer by DMA Tg 1 , Tg 1 -40~30℃, test the shape memory fixation rate of intermediate state polymers R f1...

Embodiment 1

[0031]a Weigh 107 g of tetrakis(3-mercaptopropionic acid) pentaerythritol ester, 100 g of epoxy resin E44, 8.55 g of 2,2-dimethoxy-phenylacetophenone at 70°C and mix well, such as figure 1 Shown is a schematic diagram of the raw material structure used in this embodiment.

[0032] b After the mixture was cooled to room temperature, 1.72 g of triethylamine was added, mixed uniformly, and reacted at 35° C. for 60 min to obtain a prepolymer.

[0033] c Add 78 g of trimethylolpropane triacrylate and 0.63 g of triethylamine to the prepolymer, and react at room temperature for 48 hours to obtain an intermediate state polymer.

[0034] d The resulting intermediate state polymer was subjected to shape memory studies: first the glass transition temperature of the first stage polymer was determined by DMA Tg 1 , Tg 1 At 28°C, test the shape memory fixation rate of the polymer in the first stage R f1 and shape memory recovery rate R r1， R f1 and R r1 91% and 93% respectively...

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Abstract

The invention provides a shape memory polymer network formation system of controllable heat and light two-stage reaction and a preparation method of the shape memory polymer network formation system and belongs to the field of shape memory materials. The shape memory polymer network formation system is prepared from thiol, epoxy resin, acrylic resin, a catalyst and a photoinitiator. The method comprises the following steps: uniformly mixing the thiol, the epoxy resin and the photoinitiator; adding the catalyst and reacting to obtain a pre-polymer; adding the acrylic resin into the pre-polymer;carrying out first-stage thermosetting reaction to obtain a middle-state polymer; carrying out two-stage thermosetting reaction to obtain a final-state polymer. According to the shape memory polymernetwork formation system provided by the invention, the middle-state polymer with good shape memory performance is prepared at a first stage; then the polymer with greater crosslinking density is obtained through further selective optical crosslinking, so that the mechanical performance and the service life of materials can be improved; the prepared material can be applied to the field of intelligent manufacturing, and the problems of a current two-stage shape memory polymer raw material that the structure is not clear, an application range is narrow and the like are solved.

Description

technical field [0001] The invention belongs to the field of shape memory materials, and specifically relates to a novel controllable heat and light two-stage reaction shape memory polymer network formation system based on mercaptan, epoxy resin and acrylic resin with simple process and easy control of reaction conditions and its Preparation. Background technique [0002] The two-stage polymer reaction system is a method for designing and preparing polymers with specific structures and functions through two-stage reactions. Specifically, there are two forms in which the polymer exists in the two-stage polymer reaction system. After the first stage of reaction is completed, the polymer obtained is generally called an intermediate state polymer, and the polymer obtained after the second stage of reaction is generally called a final state polymer, that is, the polymer that people want to obtain. The two-stage polymer reaction system has a wide range of applications, such as i...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L35/02C08G59/66
CPCC08G59/66C08L35/02C08L63/00C08L2201/12
Inventor 刘宇艳王武成中军谢志民王友善谭惠丰
Owner HARBIN INST OF TECH
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