Synthesis and Characterization of Polylactic Acid(PLA) and Waterborne Polyurethanes and Application on Inorganic Materials Dispersion Properties
Date Issued
2014
Date
2014
Author(s)
Chen, Yi-An
Abstract
Different kinds and constructions of polyurethanes are synthesized with different diisocyanates, polyols and chain-extenders by polycondensation in this research. And then, synthesized polyurethanes are made to stable dispersants according to suitable solvents. After all dispersants are synthesized, we discussed their characterizations, and interforces with several gathered inorganic materials which can be dispersed well in indicate dispersants.
Synthesis and application of dispersants are mainly divided into two parts. The first part is about synthesization of star shape and comb shape Polylactic Acid Polyurethane(PLA-PU) dispersants. Since buying PLA on the market is not easy, we use direct synthesization in this research. PLA polyol are synthesized with Lactic acid and ethylene glycol by dehydration and polymerization. After PLA polyol are synthesized, star shape dispersants are centered with Trimethylolpropane and comb shape dispersants are centered with Xylitol, and both are synthesized with Isophorone diisocyanate(IPDI) and finally with different proportions of PLA polyol, Poly Ethylene Glycol(PEG) and Poly Properlene Glycol(PPG) in the branches. Grain-shape materials like TiO2 and SiO2 are well-dispersed in these PLA-PU dispersants. In order to check the effects in dispersants, the samples are examined by Transmission Electron Microscope(TEM), Dynamic Light Scattring(DLS) and several instruments in this research, which proved that Grain-shape materials are well-dispersed in PLA-PU dispersants. For applications, these PLA-PU dispersants can be added in spray, dye and ink etc. for its excellent and exact dispersion effects even if the solutions stand for a long time.
The second part is about synthesization of waterborne polyurethanes(WPU) dispersants with IPDI, different proportions of PEG, PPG, and finally chain-extenders by emulsification and polymerization. Layer inorganic materials are dispersed in these WPU dispersants, like graphite can be dispersed to several slices of graphene. In order to check the effects in dispersants, the samples are examined by TEM, X-ray Diffraction(XRD), UV/VIS Spectrophotometer and several instruments in this research, which proved that layer inorganic materials are well-dispersed in these WPU dispersants. For applications, these WPU dispersants can be added in pigments, electronic materials, lubricants and several industrial materials for dispersants can promote inorganic materials’ thermal property, conductivity, transparency and many properties.
Subjects
水性聚胺酯
聚乳酸
分散劑
石墨
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-103-R01549005-1.pdf
Size
23.54 KB
Format
Adobe PDF
Checksum
(MD5):18ce5f26a9014db7d85bcabc097ce00a