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A method for improving mechanical performance of polyvinyl alcohol hydrogel

A technology of hydrogel mechanics and polyvinyl alcohol, which is applied in the field of improving the mechanical properties of polyvinyl alcohol hydrogels, can solve the problems of poor mechanical properties, decreased mechanical strength, and cannot exist stably for a long time, and achieves the effect of enhanced water resistance.

Active Publication Date: 2018-12-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its mechanical properties are still poor, and it cannot exist stably in a physiological environment for a long time, and its mechanical strength decreases rapidly after adding urea

Method used

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  • A method for improving mechanical performance of polyvinyl alcohol hydrogel
  • A method for improving mechanical performance of polyvinyl alcohol hydrogel
  • A method for improving mechanical performance of polyvinyl alcohol hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method provided in this embodiment specifically includes the following steps:

[0023] 1. Preparation of polyvinyl alcohol hydrogel (PVA hydrogel)

[0024] PVA solution (10%wt) was injected into the mold and sealed, then frozen at -56°C for 45min, and then thawed for 6h to obtain a shaped PVA hydrogel.

[0025] 2. Improvement of PVA hydrogel

[0026] The PVA hydrogel was soaked in water glass (1.86 mol / mL, Baume degree: 40, modulus: 3.3) at 90°C for 12 hours, and the improved PVA hydrogel 1 was obtained.

Embodiment 2～ Embodiment 11

[0028] As shown in table 1, change the immersion temperature, immersion temperature of PVA hydrogel in water glass:

[0029] Table 1

[0030]

Embodiment 13

[0036] The products of Example 1, Comparative Example 1 and Comparative Example 2 were taken as test samples, placed in normal temperature water and soaked for 7 days, then their mechanical properties were tested, and their stress-strain curves were drawn according to the results, figure 1 Its stress-strain curve.

[0037] Compared with the unimproved PVA hydrogel, after soaking in water at room temperature for 7 days in Example 1 and Comparative Example 2, the tensile strength increased from 0.025Mpa to 2 and 4.6Mpa respectively, and the elongation at break increased from the original The 250% increases to 280% and 440%. It shows that after the PVA hydrogel is soaked in water glass and sodium sulfate, it is soaked in water, its swelling is not obvious, it is stable in water, and its mechanical strength has been significantly improved compared with the PVA hydrogel before improvement. Improvement (hundred times), the strengthening effect of water glass is more prominent than ...

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Abstract

The invention belongs to the technical field of polymers, particularly a method for improving mechanical performance of polyvinyl alcohol hydrogel. The method includes soaking polyvinyl alcohol hydrogel into water glass at 25-100 DEG C for 6-20 h. The method can significantly improve mechanical strength of PVA hydrogel and mechanical stability of the PVA hydrogel in a plurality of aqueous solutions so that the PVA hydrogel can exist in physiological environment for long time with enhanced water resistance. Tests prove that compared with PVA hydrogel not improved, the PVA hydrogel improved by the method has tensile strength increased from original 0.025 MPa to 2 and 4.6 MPa, and has the elongation at break increased from original 250% to 280% and 440%.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a method for improving the mechanical properties of polyvinyl alcohol hydrogel. The present invention significantly improves the mechanical strength of the PVA hydrogel and improves its mechanical stability in various aqueous solutions by soaking the PVA hydrogel in water glass, so that it can be placed in a physiological environment for a long time and is water-resistant. Sexual enhancement. Tests have proved that compared with the PVA hydrogel before the improvement, the tensile strength of the PVA hydrogel improved by the method of the present invention is increased to 2 and 4.6Mpa respectively from the original 0.025Mpa, and the elongation at break is increased from the original 0.025Mpa. 250% increased to 280% and 440%. Background technique [0002] Polymer hydrogels are similar in structure and performance to biological tissues, and have good biocomp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/00C08J3/075C08L29/04
CPCC08J3/075C08J7/00C08J2329/04
Inventor 高粱郭国强王舒婷刘梦娟陈远周
Owner GUANGDONG UNIV OF TECH
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