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2022 | Book

Mechanism-Based Assessment of Structural and Functional Behavior of Sustainable Cottonid


About this book

Ronja Victoria Scholz assesses the performance of cellulose-based Cottonid for implementation as sustainable construction material. Quasi-static and fatigue tests are performed in varying hygrothermal test conditions using mechanical testing systems in combination with integrable climate chambers. To investigate humidity-driven actuation properties, customized specimen holders are designed. Accompanying microstructural in situ experiments in analytical devices enable a profound understanding of effective material-specific damage and failure mechanisms. The findings are transferred into strength-deformation diagrams as well as Woehler curves, which enable a comparative evaluation of several process-related and environmental influencing factors and can directly be used for dimensioning of Cottonid elements for structural applications. The interpretation of thermoelastic material reponse during loading is used as scientific value for lifetime prediction. Comprehensive investigations on industrial standard materials as well as structurally optimized Cottonid variants provide a scientific basis for categorizing material’s structural and functional performance towards common technical plastics and wood.

Table of Contents

Chapter 1. Introduction and Objective
The negative influence of humans onto nature’s resources and the global environment can briefly be explained on the example of the building industry as one of the main factors. Caused by the rapid expansion of Earth’s human population, new housing has to be realized continuously, for which up to now mainly non-renewable resources are used. The manufacturing of conventional building materials, like steel, concrete or synthetic fiber-reinforced plastics (FRP), and their combustion cause a considerable amount of green house gases, which lead to global warming and climate change.
Ronja Victoria Scholz
Chapter 2. State of the Art
To begin, the urgent need for sustainable solutions in technical applications is explained by discussing general aspects that have led to severe ecological problems, which can mainly be related to the upcoming of synthetic plastics in the beginning of the 20th century, as well as the general increase of human population and resource demand in terms of material and energy. Based on these explanations, possibilities to increase resource efficiency, which arise from efficient utilization of nature’s resources, like cellulose-based polymers, will be presented on the example of the building and the automotive industry, which are among the main factors for the critical developments.
Ronja Victoria Scholz
Chapter 3. Cottonid
Cottonid can be classified as hydrate cellulose among parchment paper and hydrate cellulose plastics made from solutions. The main task when producing hydrate cellulose is the treatment of cellulose fibers, e.g. in case of Cottonid provided in the form of linter paper, with an externally applied chemical reagent. The materials can be mainly differentiated by the type and condition of the reagent, i.e. by the state of cellulose modification.
Ronja Victoria Scholz
Chapter 4. Investigation Methodology
The investigations presented in this research work were performed to characterize Cottonid as one of the first technical biopolymers with currently valid standards as well as with innovative testing techniques to build up a basic understanding of structure-property-function-relationships with the aim to use this material in technical applications, especially as climate-adaptive construction material. Therefore, a mechanism-based fatigue and actuation assessment was performed by the help of instrumented experiments to correlate mechanical and functional behavior with Cottonid’s material-specific microstructure
Ronja Victoria Scholz
Chapter 5. Results and Discussion
To categorize Cottonid into a material class, its molecular structure was characterized using FTIR spectroscopy. Figure 5.1 shows an exemplary IR spectrum of industrial Cottonid material.
Ronja Victoria Scholz
Chapter 6. Summary and Outlook
This work focuses on the mechanism-based assessment of structural and functional behavior of Cottonid as sustainable natural fiber-reinforced biopolymer (NFRB) for implementation in technical applications, especially as construction material in the building and automotive industries. In the following, the findings out of the experimental results are summed up and an outlook on future invstigations is given.
Ronja Victoria Scholz
Mechanism-Based Assessment of Structural and Functional Behavior of Sustainable Cottonid
Ronja Victoria Scholz
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