A self-healing and reprocessable polysiloxane elastomer, its preparation method and application
A polysiloxane, repeated processing technology, applied in the field of new materials, can solve the problems of high reprocessing temperature, poor mechanical properties, mechanical properties and self-repairing properties can not be improved at the same time, to achieve simple and easy control of the synthesis process, improve The effect of mechanical strength
Active Publication Date: 2021-03-30
SICHUAN UNIV
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Problems solved by technology
[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, for the existing reversible covalently crosslinked polysiloxane elastomers containing hydrogen bonds or borate bonds have poor mechanical properties, high reprocessing temperature, and Diels-Alder bond crosslinking To solve the problem that the mechanical properties and self-healing properties of polysiloxane elastomers cannot be improved at the same time, the present invention provides a self-healing and reprocessable polysiloxane elastomer containing a metal ion catalyst and its preparation method. It is obtained by the reaction of primary amines and isocyanates. Under the catalysis of metals, it is a new type of thermoresponsive dynamic bond, which can make the material self-healing at 80°C, and the hydrogen bond interaction between urea bonds can improve the durability of the material. Mechanical strength, the elastomer has excellent mechanical properties, certain transparency, good reprocessing performance, high self-repair efficiency, low repair temperature, simple preparation process, and relatively low cost
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[0025] A self-healing and reprocessable polysiloxane elastomer has the following general structural formula:
[0026]
[0027] Wherein R and R1 are long chains composed of carbon, hydrogen, oxygen and nitrogen.
[0028] A method for preparing a self-healing polysiloxane elastomer that can be repeatedly processed, comprising the following steps: 3 to 13 parts by weight of a crosslinking agent, 79 parts by weight of amino-terminated polydimethylsiloxane, 8 to 10 parts by weight Dissolve 18 parts by weight of diisocyanate and 1-5 parts by weight of metal ion catalyst in tetrahydrofuran to obtain a mixed solution, control the concentration of the mixed solution to 0.1-0.6 g / mL, stir and react at room temperature for 5 minutes; then pour the prepolymer Put it into a polytetrafluoroethylene mold, cure at room temperature for 24 hours, and then put it in an oven at 80°C to continue curing for 4 hours, and then take it out from the mold to obtain a self-healing and reprocessable po...
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Abstract
The invention relates to the technical field of new materials, in particular to a self-healing and reprocessable polysiloxane elastomer and its preparation method and application, which has the following general structural formula: wherein R and R1 are composed of carbon, hydrogen, oxygen and nitrogen long chain. The self-healing and reprocessable polysiloxane elastomer prepared by the present invention has the following advantages: there are urea bonds on the molecular main chain, and the hydrogen bonds formed between the urea bonds can improve the mechanical strength of the material; Under the action, the urea bond is thermally reversible, and the material can not only self-repair but also be recycled and reprocessed; it can be applied to 3D printing, flexible electrode substrates and other fields; the preparation process is simple and the relative cost is low.
Description
technical field [0001] The invention relates to the technical field of new materials, in particular to a self-repairing and reprocessable polysiloxane elastomer, a preparation method and application thereof. Background technique [0002] The main chain of polysiloxane is composed of silicon and oxygen atoms alternately, and the silicon atoms are directly connected with organic groups. It has the characteristics of both inorganic and organic polymers, such as high and low temperature resistance, weather aging resistance, electrical insulation, ozone resistance, Hydrophobic, good gas permeability, non-toxic, biologically inert, etc. It is widely used in electrical and electronic, construction, automobile, textile, medical and other fields. Polysiloxane molecular chains are flexible and have low intermolecular forces, so they are usually used in the form of cross-linked elastomers. Traditional polysiloxane elastomers face the same problems as all thermosetting materials: (1) t...
Claims
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IPC IPC(8): C08G77/388C08G77/08
CPCC08G77/08C08G77/388
Inventor 夏和生王占华杨莉傅代华孙劭杰
Owner SICHUAN UNIV