Polydimethylsiloxane film modified by reagent containing amino functional group for detecting trinitrotoluene and preparation method thereof

A technology of polydimethylsiloxane and dimethylsiloxane, which is applied in the field of polydimethylsiloxane film and its preparation, can solve the problems of unsuitable portability, high storage cost, and unsuitable recycling of nanoparticles

Active Publication Date: 2020-10-23
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the relative technology, the nanoparticles themselves are not suitable for recycling and treatment, and there is a danger of causing secondary pollution of the water body. At the same time, there are defects that the storage cost is relatively high and it is not suitable for portability in actual detection. The present invention proposes a Polydimethylsiloxane film and preparation method thereof

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  • Polydimethylsiloxane film modified by reagent containing amino functional group for detecting trinitrotoluene and preparation method thereof
  • Polydimethylsiloxane film modified by reagent containing amino functional group for detecting trinitrotoluene and preparation method thereof
  • Polydimethylsiloxane film modified by reagent containing amino functional group for detecting trinitrotoluene and preparation method thereof

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Embodiment approach

[0043] As an embodiment of the present invention, at least one surface of the polydimethylsiloxane film of the present invention has a special surface structure. Preferably, at least one surface of the polydimethylsiloxane film has one or more of a planar structure, a grid structure, a cylindrical array structure, an inverted cone array structure, and a hemispherical array structure. More preferably, at least one surface of the polydimethylsiloxane film has a grid structure. Grid cylinder array structure Inverted cone array structure Hemispherical array structure The same surface of the polydimethylsiloxane film may have one or several different combinations of the above structures. The introduction of different surface structures is not only beneficial to increase the contact area between the polydimethylsiloxane film and the reagents containing amino functional groups, but also to increase the contact between the polydimethylsiloxane film and the TNT solution. area, which h...

Embodiment 1

[0070] Example 1 Preparation of functional composite polydimethylsiloxane film

[0071]1.1 Materials: The following amino-functional silylating agents were purchased from Aladdin Industrial Corporation: 3-(Ethoxydimethylsilyl)propylamine (APMES, 97%), γ-aminopropyl Diethoxymethylsilane (APDES, 97%), (3-aminopropyl)triethoxysilane (APTES, ≥98%) and 1H, 2H, 2H-tetradecyltrichlorosilane (PFDTS, 96%) without further purification. 2,4,6-Trinitrotoluene solution and 2,4-Dinitrotoluene solution (in methanol, concentration 1 mg / mL) were purchased from Beijing Tanmo Quality Inspection Technology Co., Ltd. Polydimethylsiloxane (PDMS) made of 184 SILICONE ELASTOMIER kit preparation.

[0072] 1.2 Fabrication of composite PDMS films: First, PDMS films were prepared by casting a liquid prepolymer of PDMS base and curing agent at a ratio of 10:1 (w / w) onto a silicon wafer containing an anti-adhesion layer (PFDTS). The mixture was then degassed for 10 minutes to remove air bubbles. Afte...

Embodiment 2

[0075] Example 2 Identification of PDMS film modified with reagent containing amino functional group and its reaction with TNT.

[0076] The key step of the preparation method of the present invention is to prepare a PDMS film modified with a reagent containing an amino functional group with a high amino content, while maintaining the chemical reactivity of the primary amine on the surface and inside of the PDMS film so that it can further react with TNT. The present invention has found a simple method of introducing silylating reagents containing amino functional groups into the surface and interior of PDMS films, that is, immersing the cured PDMS film into a solution of silylating reagents containing amino functional groups (such as 3-aminopropyl (diethoxy ) methylsilane (APDES), 30% v / v ethanol solution). Ethanol can swell the PDMS film and enhance its porous structure, allowing the silylating agent containing amino functional group to diffuse into the PDMS film, forming a ...

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Abstract

The invention discloses a polydimethylsiloxane thin film used for detecting trinitrotoluene and modified by an amino function group containing agent and a preparation method thereof. The amino function group containing agent is adsorbed on the surface and inside the polydimethylsiloxane thin film in a molecular form. The polydimethylsiloxane thin film is nontoxic, high in biocompatibility and easy to recycle, so that secondary pollution after detection can be avoided effectively; the preparation method is simple and quick, so that production cost is lowered; a carrier is firm in structure and convenient to carry. The invention provides a high-sensitivity, high-selectivity, simple and convenient method for detecting trinitrotoluene in water.

Description

technical field [0001] The invention relates to a polydimethylsiloxane film modified with an amino functional group-containing reagent and a preparation method thereof, belonging to the field of trinitrotoluene detection in water phase. Background technique [0002] Explosive substances (such as trinitrotoluene, TNT) themselves have certain toxicity and mutagenic properties. If the water that the human body comes into contact with contains a certain amount of trinitrotoluene, the trinitrotoluene molecules will penetrate the skin and enter the human body, causing leukemia or diseases such as liver failure. At present, the detection of trinitrotoluene contained in water (such as mass spectrometry and electrochemical detection methods) is limited to relying on expensive detection equipment, and cannot realize the function of portable on-site detection. To solve this problem, colorimetric probe technology has become an alternative method. The principle is to rely on the chemic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/12G01N21/78C08L83/04
CPCC08J7/12C08J2383/04G01N21/78
Inventor 段学欣唐宁
Owner TIANJIN UNIV
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