INCREASING THE ADHESIVE STRENGTH OF THE FILLER-MATRIX SYSTEM IN POLYHEXAFLUOROPROPYLENE-BASED COMPOSITE MATERIALS
Rubrics: 1. CHEMISTRY
Authors:
1.
MIREA - Rossiyskiy Tehnologicheskiy Universitet
2.
MIREA - Rossiyskiy Tehnologicheskiy Universitet
3.
MIREA - Rossiyskiy Tehnologicheskiy Universitet
4.
MIREA - Rossiyskiy Tehnologicheskiy Universitet
5.
MIREA - Rossiyskiy Tehnologicheskiy Universitet
Type:
Article
Pages:
from 11
to 15
Status:
Published
Received:
04.08.2025
Accepted:
07.08.2025
Published:
07.08.2025
Language:
Russian
Keywords:
POLYHEXAFLUOROPROPYLENE, COMPOSITE MATERIALS, FLUOROPOLYMERS, ADHESIVE STRENGTH
Abstract (English):
Composite materials using fluoropolymers are promising for application in thermal interfaces due to their exceptional stability. However, to ensure the adhesive strength of the joints at the filler-matrix boundary, preliminary surface preparation is necessary, including development of the surface area, creation of active centers and functional groups. The dependence of the contact angle of wetting of the aluminum surface treated with perfluoroalkyltriethoxysilane under different anodizing conditions was studied. The nature of the surface changes from hydrophilic to hydrophobic, with an increase in the hole size, a nonlinear dependence with a maximum is observed. The dependence of the adhesive strength of the aluminum-polyhexafluoropropylene joint on the surface treatment method was studied. The use of perfluoroalkyltriethoxysilane containing a perfluoroalkyl substituent similar to the polymer matrix link allows for an increase in the adhesive strength of the joint. The adhesive strength was determined using tests on a tensile testing machine. A series of experiments was conducted to select the surface treatment conditions to achieve the maximum adhesive strength of the composite. The obtained data indicate the presence of a maximum in the dependence of the adhesive strength on the specific surface area. The maximum corresponds to the size of the holes, at which diffusion limitations are eliminated during the formation of a polymer film in the pores of an anodized aluminum plate. In this case, the maximum specific surface area is achieved with smaller hole sizes, which corresponds to the maximum number of possible active centers on the surface. These studies can contribute to the creation of composite materials combining the positive qualities of polyhexafluoropropylene and the functional features of fillers, eliminating the negative effect of weak adhesion on the mechanical properties of composites, thereby significantly expanding the range of application of such materials in various fields of use.
Composite materials using fluoropolymers are promising for application in thermal interfaces due to their exceptional stability. However, to ensure the adhesive strength of the joints at the filler-matrix boundary, preliminary surface preparation is necessary, including development of the surface area, creation of active centers and functional groups. The dependence of the contact angle of wetting of the aluminum surface treated with perfluoroalkyltriethoxysilane under different anodizing conditions was studied. The nature of the surface changes from hydrophilic to hydrophobic, with an increase in the hole size, a nonlinear dependence with a maximum is observed. The dependence of the adhesive strength of the aluminum-polyhexafluoropropylene joint on the surface treatment method was studied. The use of perfluoroalkyltriethoxysilane containing a perfluoroalkyl substituent similar to the polymer matrix link allows for an increase in the adhesive strength of the joint. The adhesive strength was determined using tests on a tensile testing machine. A series of experiments was conducted to select the surface treatment conditions to achieve the maximum adhesive strength of the composite. The obtained data indicate the presence of a maximum in the dependence of the adhesive strength on the specific surface area. The maximum corresponds to the size of the holes, at which diffusion limitations are eliminated during the formation of a polymer film in the pores of an anodized aluminum plate. In this case, the maximum specific surface area is achieved with smaller hole sizes, which corresponds to the maximum number of possible active centers on the surface. These studies can contribute to the creation of composite materials combining the positive qualities of polyhexafluoropropylene and the functional features of fillers, eliminating the negative effect of weak adhesion on the mechanical properties of composites, thereby significantly expanding the range of application of such materials in various fields of use.
Keywords:
POLYHEXAFLUOROPROPYLENE, COMPOSITE MATERIALS, FLUOROPOLYMERS, ADHESIVE STRENGTH
POLYHEXAFLUOROPROPYLENE, COMPOSITE MATERIALS, FLUOROPOLYMERS, ADHESIVE STRENGTH
