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Ester exchange type dynamic covalent polymer network material containing non-planar ring and preparation method of ester exchange type dynamic covalent polymer network material.

A non-planar, transesterification technology, applied in the field of sustainable thermosetting resin preparation, can solve the problems of complex preparation process and slow remodeling, and achieve the effect of simple preparation process, thermal maintenance, and strong operability

Active Publication Date: 2021-07-09
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Existing literature discloses a kind of preparation method of dynamic transfer self-catalyzed transesterification type dynamic covalent polymer network, at first make maleic anhydride (succinic anhydride) and trimethylol propane monoesterification reaction, the polycarboxylate of synthesis Compounds cure bisphenol A epoxy, and the transesterified dynamic network obtained can be reshaped by hot pressing without a catalyst, but the preparation process of this method is complicated, and the remodeling is still slow

Method used

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  • Ester exchange type dynamic covalent polymer network material containing non-planar ring and preparation method of ester exchange type dynamic covalent polymer network material.

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preparation example Construction

[0020] Specifically, as an aspect of the technical solution of the present invention, the preparation method of a transesterification type dynamic covalent polymer network material containing a non-planar ring comprises: making an epoxy monomer containing a non-planar ring, The homogeneous mixed reaction system of cyclic acid anhydrides and polyhydroxy compounds containing non-planar rings is pre-reacted, and then undergoes curing reaction to obtain transesterification-type dynamic covalent polymer network materials containing non-planar rings.

[0021] The reaction mechanism of the present invention is that: the preparation method of the non-planar ring-containing transesterification dynamic covalent polymer network proposed by the present invention introduces a non-planar ring structure, and through the conformational transformation of the non-planar ring, after mixing the three reaction raw materials evenly , the mixed system is pre-reacted. In the mixed system of the three,...

Embodiment 1

[0037]Mix diglycidyl hexahydrophthalate, hexahydrophthalic anhydride, and trimethylolpropane in a single-necked flask at a molar ratio of 1:2.5:0.83; place the mixed system in an oil bath at 90°C for a pre-reaction for 5 hours ; Pour the pre-reaction product into a polytetrafluoroethylene mold, put the mold into a vacuum oven, and evacuate it; the control system is cured under vacuum conditions, and the curing process is 120°C for 2h, 150°C for 2h, and 180°C for 2h ; After natural cooling, the solidified product is taken out from the oven to obtain a transparent light yellow film material (ie, the aforementioned transesterification-type dynamic covalent polymer network material containing non-planar rings).

[0038] After the polymer network material prepared in this example is cut into pieces, it can be hot-pressed at 180°C for 1 hour with a flat vulcanizer, and the complete material can be obtained again. Please refer to figure 1 shown. In addition, the material had a glass...

Embodiment 2

[0040] Mix diglycidyl methyl hexahydrophthalate, hexahydrophthalic anhydride, and pentaerythritol in a single-necked flask at a molar ratio of 1:2.5:0.625, add an appropriate amount of ethyl acetate to the flask to clarify the system; put the mixed system on Pre-react in an oil bath at 80°C for 5 hours, and volatilize the solvent while reacting; pour the pre-reaction product into a polytetrafluoroethylene mold, put the mold into a vacuum oven, and vacuum; control the system to cure under vacuum conditions, The process is to react at 120°C for 2 hours, at 150°C for 2 hours, and at 180°C for 2 hours; after natural cooling, take the solidified product out of the oven to obtain a transparent light yellow film material.

[0041] After the polymer network material prepared in this example is cut into pieces, it can be hot-pressed at 180°C for 1 hour with a flat vulcanizer, and the complete material can be obtained again. Please refer to figure 1 shown. In addition, the material had...

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Abstract

The invention discloses an ester exchange type dynamic covalent polymer network material containing a non-planar ring and a preparation method of the ester exchange type dynamic covalent polymer network material. The preparation method comprises the steps of carrying out pre-reaction on a uniformly mixed reaction system containing an epoxy monomer containing a non-planar ring, cyclic anhydride containing a non-planar ring and a polyhydroxy compound, and then carrying out curing reaction to obtain the ester exchange type dynamic covalent polymer network material containing the non-planar ring. According to the one-pot preparation method provided by the invention, a non-planar ring structure is introduced, and through conformation transformation of the non-planar ring, chain segment movement in the remodeling process is accelerated, so that the prepared dynamic transfer autocatalysis ester exchange type network material containing the non-planar ring not only has excellent thermal, mechanical and stable properties, but also can realize autocatalysis rapid remodeling processing. Moreover, the preparation process is simple, high in operability and easy to implement, industrial production is easy to realize, and the problems that an existing autocatalytic ester exchange system is poor in thermal, mechanical and stable performance and slow in autocatalytic remodeling are hopefully solved.

Description

technical field [0001] The invention relates to a transesterification type dynamic covalent polymer network, in particular to a preparation method and related application of a transesterification type dynamic covalent polymer network material containing non-planar rings, which belongs to the preparation technology of sustainable thermosetting resin field. Background technique [0002] Thermosetting resins have excellent thermal and mechanical properties and dimensional stability, and are widely used in coatings, adhesives, composite materials, electronic packaging and other fields. However, traditional thermoset materials cannot be recycled by melting or dissolving once formed. Introducing dynamic covalent bonds into the cross-linked network, and realizing the remodeling of thermosetting resins through the breaking and reorganization of dynamic bonds under the action of stimuli (heat, light, pH value, etc.), is one of the effective ways to solve the recycling problem of tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/42C08G59/62C08J5/18C08L63/00
CPCC08G59/4215C08G59/4284C08G59/62C08J5/18C08J2363/00Y02W30/62
Inventor 刘艳林马松琪朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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