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Stretchable hydrogel based on modified silica nanoparticle crosslinking agent and preparation method and application thereof

A technology of silica and nanoparticles, which is applied in the field of new polymer functional materials, can solve the problem of not having strong resistance to propagation, and achieve the effects of increasing resistance to crack propagation, relieving stress concentration, and good elongation

Active Publication Date: 2019-10-22
GUANGZHOU UNIVERSITY
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  • Abstract
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  • Claims
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Problems solved by technology

These gels are highly extensible and elastic, but not very resistant to propagation of existing cracks

Method used

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  • Stretchable hydrogel based on modified silica nanoparticle crosslinking agent and preparation method and application thereof
  • Stretchable hydrogel based on modified silica nanoparticle crosslinking agent and preparation method and application thereof
  • Stretchable hydrogel based on modified silica nanoparticle crosslinking agent and preparation method and application thereof

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Embodiment Construction

[0040] The present invention will be further described in detail below with reference to the examples and drawings, but the implementation of the present invention is not limited thereto.

[0041] The reagents used in the examples can be routinely purchased from the market unless otherwise specified.

[0042] Use a general testing machine (HZ-1007E, Dongguan Lixian Instrument) to test the sample at a tensile rate of 100mm / min, and record the tensile rate and tensile strength of the sample when it breaks.

[0043] The silicon dioxide nano cross-linking agent used in the embodiment is synthesized through the following steps:

[0044] Take 480mL of distilled water and 1g of cetyltrimethylammonium bromide in a flask, heat to 80°C, and then add 0.28g of solid sodium hydroxide. Add 5.3g tetraethyl orthosilicate dropwise to the vigorously stirred solution, after the dropwise addition, react for 2h, dry and grind to obtain silica nanoparticles; Ethanol is uniformly dispersed in an u...

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Abstract

The invention belongs to the technical field of novel polymer functional materials, and discloses a stretchable hydrogel based on a modified silica nanoparticle cross-linking agent and a preparation method and application thereof. The method specifically comprises the following steps: uniformly mixing sodium alginate, acrylamide, the modified silica cross-linking agent, N, N-methylene bisacrylamide and an initiator in water, and carrying out radical polymerization to obtain a final product. The method successfully prepares a novel modified silica reinforced double network structure hydrogel (alginate / polyacrylamide). The prepared silica cross-linking agent grafted with PAMAM on the surface has strong hydrogen bonds with polymer chains, and the addition of the silica cross-linking agent remarkably improves the mechanical strength of the hydrogel while maintaining good elongation. At the same time, due to the adoption of the double network system, when the double network hydrogel undergoes tensile deformation, stress concentration can be effectively relieved, and crack propagation resistance can be increased.

Description

technical field [0001] The invention belongs to the technical field of novel polymer functional materials, and in particular relates to a stretchable hydrogel based on a modified silicon dioxide nanoparticle crosslinking agent and its preparation method and application. Background technique [0002] Hydrogels are soft and wet materials consisting of three-dimensional polymer networks into which large amounts of water have been inserted. Owing to their hydrophilicity and other unique properties such as biocompatibility, biodegradability and reactivity to various stimuli, hydrogels can be used as tissue engineering scaffolds, drug delivery vehicles, fluid actuators, extracellular matrices for biological research. However, most hydrogels lack mechanical strength. Therefore, in current applications, hydrogels are rarely used to withstand significant mechanical loads. The mechanical properties of hydrogels are generally poor due to the lack of effective energy dissipation mech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F222/38C08K9/06C08K9/08C08K3/36C08J3/075C08J3/24C08L33/26C08L5/04
CPCC08F220/56C08J3/075C08J3/243C08J2333/26C08J2405/04C08K3/36C08K9/06C08K9/08C08F222/385
Inventor 吴旭陈睿徐秀彬于丹凤彭思玉毛桃嫣王天帆
Owner GUANGZHOU UNIVERSITY
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