Abstract
Small additions of nanofiber materials make it possible to change the properties of polymers. However, the uniformity of the additive distribution and the strength of its bond with the polymer matrix are determined by the surface of the nanofibers. Silanes, in particular, allow you to customize the surface for better interaction with the matrix. The aim of our work is to study an approach to silanization of nanofibers of aluminum oxide to obtain a perfect interface between the additive and the matrix. The presence of target silanes on the surface of nanofibers was shown by XPS methods. The presence of functional groups on the surface of nanofibers was also shown by the methods of simultaneous thermal analysis, and the stoichiometry of functional groups with respect to the initial hydroxyl groups was studied. The number of functional groups precipitated from silanes is close to the number of the initial hydroxyl groups, which indicates a high uniformity of the coating in the proposed method of silanization. The presented technology for silanizing alumina nanofibers is an important approach to the subsequent use of this additive in various polymer matrices.
Highlights
Nanomaterials are characterized by the fact that their properties are determined not so much by their internal structure as by the structure of their surface [1]
The aim of our work is to study an approach to silanization of nanoparticles in which functional groups bind only to the surface of nanofibers, and hydrolyzed silanes do not create extraneous aggregates on the surface
Alumina nanofibers are synthesized from molten aluminum in air humidity of 98%
Summary
Nanomaterials are characterized by the fact that their properties are determined not so much by their internal structure as by the structure of their surface [1]. The addition of filamentary nanoparticles leads to hardening of the compounded matrices [2]. This makes it possible to use such additives in polymeric materials for the tuning of their strength [3,4,5,6,7,8,9]. Depending on the nanoparticle’s surface properties, it can both bind and order polymer chains around itself [10] and, on the contrary, can loosen the structure of the polymer, creating an additional free volume [11]. To achieve the first property, the nanomaterial’s surface should ideally be as similar as possible to the polymer’s structure, so as to bind the polymer matrix to the surface of the nanomaterial by covalent bonds. The nanomaterial’s surface should be extremely antagonistic to the polymer material, so that the functional groups on its surface repel partially or completely all the elements of the polymer chain links
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