| Summary: | 碩士 === 逢甲大學 === 紡織工程所 === 94 === Polylactic acid fibers have properties that are high crystallization, good flexibility, heat-resistant and very durable. This product has superior performance and may replace polyester fibers in daily use. The main advantage is that polylactic acid fibers are biodegradable. On disposal a microorganism will be released to allow fermentation and breakdown the high polymer chain within the fiber. It will decompose causing non-crystallization of the fiber that then becomes a low molecular compound. It will crack the fiber and the surface will corrode and wrinkle. Finally, it will turn into water and carbon dioxide.Therefore, it will not cause more pollution in the environment.
In this thesis, we will try to synthesis diazo disperse dyes coupling with long alkyl chain, so we can make dyestuffs products that have a strong Van der waals force with the fiber to increase the combination of dyestuffs and polylactic acid fibers. In order to determine that the dyestuffs have synthesis correctly we used spectrometric identification of organic compounds, utilizing K/S value to compare the dyeing of the fabric under every condition. Finally, we checked degradation of the fabric under temperature, using observation through an electronic microscope, and then using an atomic force microscope to set up a dyeing model for polylactic acid fibers.
There are two types of groups in the dyestuffs structure, carboxyl and hydroxyl.We tested the colour fast quality; the dyestuff of A series had both 4 ~ 5 grades of water fastness and friction fastness. The dyestuffs of B series had 3 ~ 4 grades of water fastness. Without a long alkyl chain it is not possible to make a strong Van der waals force with this fiber and this caused the dyestuffs molecule to flow out from the fabric resulting in a drop of 2 ~ 3 grades. Therefore we now know that by changing the alkyl chain we can improve colour fastness of fabrics.
|
|---|
