Investigation of non-isocyanate urethane functional latexes and carbon nanofiller/epoxy coatings
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ndltd-OhioLink-oai-etd.ohiolink.edu-akron14457337242021-08-03T06:33:29Z Investigation of non-isocyanate urethane functional latexes and carbon nanofiller/epoxy coatings Meng, Lei Polymer Chemistry Polymers Chemistry This dissertation consists of two parts. In the first part, a new class of non-isocyanate urethane methacrylates was synthesized and the effect of the new monomers on the urethane functional latex was investigated. The second part focused on a comparison of carbon nanofillers in inorganic/organic epoxy coating system for anticorrosive applications.A new class of non-isocyanate urethane methacrylates (UMAs) monomers was synthesized through an environmentally friendly non-isocyanate pathway. The kinetics of seeded semibatch emulsion polymerization of UMAs with methyl methacrylate (MMA) and butyl acrylate (BA) was monitored. The particle size and morphology were investigated by dynamic light scattering (DLS), ultrasound acoustic attenuation spectroscopy (UAAS) and transmission electron microscopy (TEM). The minimum film formation temperature (MFFT), mechanical and viscoelastic properties were studied. It was found that the emulsion polymerization processes all proceeded via Smith-Ewart control, leading to the uniform morphology and particle size. The glass transition temperature (Tg) and the mechanical properties of poly(MMA/BA/UMA) decreased with the increasing chain length of urethane methacrylate monomers due to the increasing flexibility of side chains. Without the effect of Tg, lower MFFT and improved mechanical properties were observed from urethane functional latexes. The improved mechanical properties were due to the increasing particle interaction by forming hydrogen bonding. Furthermore, the effect of urethane functionality in terms of the polymer composition, the location and the concentration was investigated by the batch, single-stage and two-stage semibatch polymerization of 2-[(butylcarbamoyl)oxy]ethyl methacrylate (BEM) with MMA and BA. The core-shell and homogeneous structures were evaluated by TEM, differential scanning calorimetry (DSC), and solid state nuclear magnetic resonance (SS-NMR). The compositional drift was observed from the batch polymerization. The mechanical properties were improved with increasing urethane and the best was from the urethane in the shell due to higher concentration of urethane in the continuous phase.The inorganic/organic alkoxysilane modified epoxy coating system was formulated with carbon nanofillers, i.e. carbon black, mixture of carbon black and nanotubes, unpurified and purified non-fullerene carbon nanotubes and fullerene carbon nanotubes. Mechanical, thermal, electrical and anticorrosive properties of cured films were evaluated by tensile tests, DMTA, DSC, four-point probe method and electrochemical impedance spectroscopy (EIS), respectively. It was found that the most efficient material to enhance the electrical conductivity and anticorrosive properties of nanocomposite coating systems was fullerene CNTs. 2015 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1445733724 http://rave.ohiolink.edu/etdc/view?acc_num=akron1445733724 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
collection |
NDLTD |
language |
English |
sources |
NDLTD |
topic |
Polymer Chemistry Polymers Chemistry |
spellingShingle |
Polymer Chemistry Polymers Chemistry Meng, Lei Investigation of non-isocyanate urethane functional latexes and carbon nanofiller/epoxy coatings |
author |
Meng, Lei |
author_facet |
Meng, Lei |
author_sort |
Meng, Lei |
title |
Investigation of non-isocyanate urethane functional latexes and carbon nanofiller/epoxy coatings |
title_short |
Investigation of non-isocyanate urethane functional latexes and carbon nanofiller/epoxy coatings |
title_full |
Investigation of non-isocyanate urethane functional latexes and carbon nanofiller/epoxy coatings |
title_fullStr |
Investigation of non-isocyanate urethane functional latexes and carbon nanofiller/epoxy coatings |
title_full_unstemmed |
Investigation of non-isocyanate urethane functional latexes and carbon nanofiller/epoxy coatings |
title_sort |
investigation of non-isocyanate urethane functional latexes and carbon nanofiller/epoxy coatings |
publisher |
University of Akron / OhioLINK |
publishDate |
2015 |
url |
http://rave.ohiolink.edu/etdc/view?acc_num=akron1445733724 |
work_keys_str_mv |
AT menglei investigationofnonisocyanateurethanefunctionallatexesandcarbonnanofillerepoxycoatings |
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1719438923764072448 |