Photothermally-induced shape memory composite and preparation method thereof

Abstract

The invention provides photothermally-induced shape memory composite. The composite comprises a temperature-sensitive material and a photothermal conversion material distributed in the temperature-sensitive material, wherein the photothermal conversion material accounts for 0.1%-20% of the mass sum of the temperature-sensitive material and the photothermal conversion material. The photothermally-induced shape memory composite is obtained by curing a mixed dispersion liquid formed by the photothermal conversion material and the temperature-sensitive material. The photothermal conversion material in the phoththermally-induced shape memory composite stimulates the temperature-sensitive material by converting light into heat, so that the shape memory function of the composite is realized. The shape memory effect can be realized by exciting ultraviolet rays in a wider temperature range, and the photothermally-induced shape memory composite does not have high temperature dependency and is high in reliability, good in safety, convenient to operate and control, good in practicability and wide in applicability. The invention further provides a preparation method of the photothermally-induced shape memory composite. The preparation process is diversified, simple and suitable for various substrates.

Description

technical field

[0001] The invention relates to the field of polymer materials, in particular to a photothermal shape memory composite material and a preparation method thereof. Background technique

[0002] Shape memory polymers are a class of functional or smart polymers that can "remember" the original shape after the initial shape obtained by one-time molding is processed into a temporary shape, and can be restored to the original shape under the action of external stimuli. Shape, using its shape memory function, shape memory polymers can be widely used in structural connectors, packaging materials, printing materials, medical and other fields.

[0003] In shape memory polymers, there are various external stimuli that trigger the shape memory effect, such as light, electricity, or treatment with chemicals. For example, azobenzene changes from a trans structure to a cis structure under UV light irradiation, causing the material to shrink, and then changes back to the tra...

Examples

Embodiment 1

[0052] A preparation method of a photothermally induced shape memory composite material, comprising the following steps:

[0053] (1) Preparation of surface functionalized gold nanorods:

[0054] a. After adding 0.2 mL of chloroauric acid solution (13 mM) to 9 mL (118 mM) of cetyl trimethyl ammonium bromide, 90 μL of silver nitrate solution (25 mM) was added thereto, and then 120 μL of silver nitrate solution was added thereto. The catechol and 5 μl of sodium borohydride solution were reacted at room temperature for 8 hours to obtain a 5 mM solution of gold nanorods.

[0055] b. Amination of gold nanorods:

[0056] Take 2 mL of the 5 mM gold nanorod solution in the above step (a), add 4 mL and 100 mM of mercaptoethylamine, stir at room temperature, and then purify by centrifugation, and then disperse into 2 mL of water to obtain 5 mM mercaptoethylamine-functionalized gold nanoparticles. Rod, that is, light-to-heat conversion material;

[0057] (2) Intermixing of gold nanoro...

Embodiment 2

[0063] A preparation method of a photothermally induced shape memory composite material, comprising the following steps:

[0064] (1) Preparation of polyaniline nanofibers:

[0065] 4 mmol of aniline was dissolved in 4 mL of methylene chloride, 4 mL of 1 mol / L ferric chloride solution was added thereto, polyaniline nanofibers were obtained by interfacial polymerization for 10 min, and the product was purified with deionized water to obtain a photothermal conversion material;

[0066] (2) Mixing of polyaniline nanofibers and temperature-sensitive materials:

[0067] Take N-isopropylacrylamide (1.0g), acrylic acid (0.5mL), and methylenebisacrylamide (0.1g) as the prepolymer of the temperature-sensitive material, and add 3mL, 0.1mol / L polyaniline nanofibers to it , adding 8 mL of water for ultrasonic dispersion to obtain a mixed dispersion of the photothermal conversion material and the temperature-sensitive material;

[0068] (3) Chromium layer and gold layer with thickness of...

Embodiment 3

[0072] A preparation method of a photothermally induced shape memory composite material, comprising the following steps:

[0073] (1) Preparation of surface functionalized reduced graphene oxide (rGO):

[0074] 4 mmol of aniline was dissolved in 4 mL of dichloromethane, 4 mL of 1 mol / L ferric chloride solution was added thereto, polyaniline nanofibers were obtained by interfacial polymerization for 10 min, and the product was purified with deionized water, that is, a photothermal conversion material;

[0075] 150 μL of the elastin-like polypeptide derivative V at a concentration of 2 mg / mL 50 GB solution was mixed with 450 μL of reduced graphene oxide solution (rGO) in a mass ratio of 6:1, and mixed at 4 °C for 18 h to obtain V 50GB-functionalized rGO, purified with deionized water, i.e. functionalized photothermal conversion material;

[0076] (2) Mixed copolymerization of functionalized rGO and thermosensitive materials:

[0077] Take 0.2 mL of the above functionalized rG...

technical field

[0001] The invention relates to the field of polymer materials, in particular to a photothermal shape memory composite material and a preparation method thereof. Background technique

[0002] Shape memory polymers are a class of functional or smart polymers that can "remember" the original shape after the initial shape obtained by one-time molding is processed into a temporary shape, and can be restored to the original shape under the action of external stimuli. Shape, using its shape memory function, shape memory polymers can be widely used in structural connectors, packaging materials, printing materials, medical and other fields.

[0003] In shape memory polymers, there are various external stimuli that trigger the shape memory effect, such as light, electricity, or treatment with chemicals. For example, azobenzene changes from a trans structure to a cis structure under UV light irradiation, causing the material to shrink, and then changes back to the tra...

Examples

Embodiment 1

[0052] A preparation method of a photothermally induced shape memory composite material, comprising the following steps:

[0053] (1) Preparation of surface functionalized gold nanorods:

[0054] a. After adding 0.2 mL of chloroauric acid solution (13 mM) to 9 mL (118 mM) of cetyl trimethyl ammonium bromide, 90 μL of silver nitrate solution (25 mM) was added thereto, and then 120 μL of silver nitrate solution was added thereto. The catechol and 5 μl of sodium borohydride solution were reacted at room temperature for 8 hours to obtain a 5 mM solution of gold nanorods.

[0055] b. Amination of gold nanorods:

[0056] Take 2 mL of the 5 mM gold nanorod solution in the above step (a), add 4 mL and 100 mM of mercaptoethylamine, stir at room temperature, and then purify by centrifugation, and then disperse into 2 mL of water to obtain 5 mM mercaptoethylamine-functionalized gold nanoparticles. Rod, that is, light-to-heat conversion material;

[0057] (2) Intermixing of gold nanoro...

Embodiment 2

[0063] A preparation method of a photothermally induced shape memory composite material, comprising the following steps:

[0064] (1) Preparation of polyaniline nanofibers:

[0065] 4 mmol of aniline was dissolved in 4 mL of methylene chloride, 4 mL of 1 mol / L ferric chloride solution was added thereto, polyaniline nanofibers were obtained by interfacial polymerization for 10 min, and the product was purified with deionized water to obtain a photothermal conversion material;

[0066] (2) Mixing of polyaniline nanofibers and temperature-sensitive materials:

[0067] Take N-isopropylacrylamide (1.0g), acrylic acid (0.5mL), and methylenebisacrylamide (0.1g) as the prepolymer of the temperature-sensitive material, and add 3mL, 0.1mol / L polyaniline nanofibers to it , adding 8 mL of water for ultrasonic dispersion to obtain a mixed dispersion of the photothermal conversion material and the temperature-sensitive material;

[0068] (3) Chromium layer and gold layer with thickness of...

Embodiment 3

[0072] A preparation method of a photothermally induced shape memory composite material, comprising the following steps:

[0073] (1) Preparation of surface functionalized reduced graphene oxide (rGO):

[0074] 4 mmol of aniline was dissolved in 4 mL of dichloromethane, 4 mL of 1 mol / L ferric chloride solution was added thereto, polyaniline nanofibers were obtained by interfacial polymerization for 10 min, and the product was purified with deionized water, that is, a photothermal conversion material;

[0075] 150 μL of the elastin-like polypeptide derivative V at a concentration of 2 mg / mL 50 GB solution was mixed with 450 μL of reduced graphene oxide solution (rGO) in a mass ratio of 6:1, and mixed at 4 °C for 18 h to obtain V 50GB-functionalized rGO, purified with deionized water, i.e. functionalized photothermal conversion material;

[0076] (2) Mixed copolymerization of functionalized rGO and thermosensitive materials:

[0077] Take 0.2 mL of the above functionalized rG...

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