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Title: Investigation of new bionic materials for substrate-independent colouration of textile materials
Authors: So, Lai Lai
Degree: Ph.D.
Issue Date: 2015
Abstract: Bio-inspired by the remarkable adhesion of marine mussels' adhesive proteins (MAPs) to almost any surface in a tidal environment, a novel bio-adhesive based method was developed for colouration of various textile materials. The colouration of various materials was easily achieved at room temperature through a simple dip-coating procedure. This method showed the characteristics of substrate-independence and room temperature colouration. Compared to the traditional colouration, it has the advantages of easy to application and low energy consumption. 3,4-dihydroxy-L-phenylalanine (DOPA), was found to be one of the amino acid responsible for the adhesion of the marine mussels. Due to the structural similarity to DOPA, dopamine was chosen as a biomimetic precursor for the adhesive colouration. On the one hand, dopamine-induced colouration was successfully developed through its in situ polymerization for various textile materials, organic and inorganic materials,and even materials resistant to colouration. The colour appearance of the dyed materials could be tuned in a controllable way through the incorporation of different nucleophilic species such as amino acid,aromatic and heterocyclic components. The properties of the dyed materials including colours, fastness, surface morphology, composition and wettability were studied using colorimetric analysis, fastness evaluation, scanning electron microscopy, X-ray photoelectron spectroscopy and water contact angle measurement, respectively. The results indicated that the various textile materials were successfully coloured. In order to achieve a wider range of colour on textiles materials, commercially available dyes, being natural or synthetic, were also incorporated in the colouration process, in addition to the above-mentioned nucleophilic compounds. The dyed fabrics were evaluated by colorimetric analysis, scanning electron microscopy optical microscopic analysis and colour fastness tests. The obtained results showed that the fabrics were also successfully dyed with good colouration property. Furthermore, a novel kind of cateholamine dye was designed and synthesized for textile material colouration as an approach to enhance the versatility of the dyes and further enrich the colour gamut produced on textiles. In this approach, a commercially available dye of Acid Yellow 11 was exampled as a model of chromophore, and dopamine was introduced as an adhesive antenna to enhance the dye fixation on textile materials. The chemical structure of the synthesized dye was confirmed from the analyses of high resolution mass spectrometry, proton and carbon nuclear magnetic resonance spectroscopy, the absorption spectra was tested by UV-visible spectroscopy. The UV-visible results showed that the introduction of the catechol group did not significantly change the absorption of the parent chromophore. The colouration results revealed that at room temperature the synthesized catechol dye had good colour yield on various textile fabrics,and the dyed fabrics had good fastness properties. This developed method showed the substrate-independence to some extent and was especially suitable for those textile materials difficult to be dyed with traditional method, such as polylactic acid and polypropylene. In addition,less energy consumption and colouration auxiliaries were needed by this colouration method. The biomimetic concept and its successful application represent a new step forward in textile material colouration and it is a promising alterative to the traditional process, which is substrate-dependent and high energy consumption.
Subjects: Dyes and dyeing -- Textile fibers.
Hong Kong Polytechnic University -- Dissertations
Pages: 181 pages : color illustrations
Appears in Collections:Thesis

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