Preparation of polymer/clay hybrid encapsulation for barrier applications controlled by Hansen Solubility Parameters

  • Barrier materials play important roles in modern food packaging or as a protection of electronics/metals against water permeation. There are often a combination of permeable and impermeable materials and can be divided into inorganic coatings, multilayer structures or nanocomposites. Impermeable layered materials can play an important role in such composites. Studies have shown that layer materials can have a high impact on nanocomposite-based barrier applications, described by the tortuous path model. In this work, 2D materials (organophilic fluoromica, graphene and molybdenum disulfide (MoS2)) have been used to prepare such inorganic coatings and nanocomposites. Nevertheless, for a high impact, complete delamination (exfoliation) is needed for each particle into separate layers. Exfoliation needs to be energetically favorable, which means that interface interactions must be precisely adjusted between 2D material and dispersant/matrix. Such energetically favorable systems can be described by there surface energies via Hansen Solubility Parameters (HSP). Those parameters are known for more than 1200 materials like solvents, polymers, and optical absorbing materials, such as graphene or MoS2. I, therefore, have investigated whether it is possible to determine HSP of organophilic fluoromica. The results have shown, that experimental determinate HSP are more accurate than those calculated theoretically, using group-contribution approach. Such precise HSP values are important for the prediction of dispersion interactions of those fluoromicas with dispersants and polymers. Furthermore, I have investigated whether such HSP values have an impact on barrier applications. The result of this work shows, that experimentally determined HSP are a helpful tool for selecting suitable dispersants and 2D materials to prepare favorable multilayer structures or nanocomposites in specific matrices. This approach is beneficial to functional coating and adhesive applications.

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Publishing Institution:IRC-Library, Information Resource Center der Jacobs University Bremen
Granting Institution:Jacobs Univ.
Author:Michael Huth
Referee:Veit Wagner, J├╝rgen Fritz, Odo Wunnicke
Advisor:Veit Wagner
Persistent Identifier (URN):urn:nbn:de:gbv:579-opus-1008218
Document Type:PhD Thesis
Date of Successful Oral Defense:2018/07/12
Date of First Publication:2018/08/30
Academic Department:Physics & Earth Sciences
PhD Degree:Physics
Focus Area:Health
Other Organisations Involved:Evonik Industries
Call No:2018/18

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