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Kuan-Chen Huang Master Thesis.pdf (1.49 MB)

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Study The Application of Non-isocyanate Approach in Polyurethanes and Diols

Huang, Kuan-Chen
http://rave.ohiolink.edu/etdc/view?acc_num=akron161729301625948

Abstract Details

2021, Master of Science, University of Akron, Chemical Engineering.
Conventional polyurethanes have been widely used over the world for foams, coatings, and food packaging films. However, conventional polyurethanes are produced from isocyanates which are harmful and toxic. Recently, scientists have developed alternative processes to produce polyurethanes without using isocyanates. The most used non-isocyanate method to obtain the urethane group is by the reaction of cyclic carbonates with amines. This method becomes popular is because various cyclic carbonates and amines can be selected. The work of this thesis is the application of the non-isocyanate approach through the cyclic carbonate/amine method. In this thesis, a non-isocyanate polyurethane (NIPU) and urethane diols were developed using the non-isocyanate approach. In Chapter 3, a zinc phosphate pigmented NIPU was designed to improve the corrosion resistance of the polyurethane coating. In Chapter 4, urethane diols were produced by the non-isocyanate approach. And then, the urethane diols were crosslinked by a hexa(methoxymethyl) melamine (HMMM) crosslinker to increase the mechanical property of the coating. In Chapter 3, the NIPU was successfully synthesized from bisphenol A cyclic carbonate and fatty acid amine. Different weight percentages of zinc phosphate pigments were added to the NIPU. The corrosion resistance of the NIPU coating was investigated by electrochemical impedance spectroscopy and salt spray measurement. The corrosion resistance of the NIPU was increased by adding the zinc phosphate pigments. The NIPU coating with 5 wt. % zinc phosphate pigment showed the best corrosion resistance among the whole formulations. This study provides a capability for the application of NIPU in corrosion protective coatings. In Chapter 4, the urethane diols were produced by the non-isocyanate approach at room temperature without using any catalyst. Two urethane diols with different middle chains were obtained by the reaction of 1,4-diaminobutane or 1,6-diaminohexane with ethylene cyclic carbonate, respectively. Different weight percentages of HMMM crosslinker were mixed with urethane diols. The mechanical property of the coating was investigated by tensile test, adhesion test, and conical mandrel bend test. The HMMM crosslinker can react with urethane diols to form a polymer network to generate a coating film. This study provides a non-isocyanate way to produce urethane diols and successfully used them in melamine-formaldehyde coatings. The urethane diols can be further utilized for producing coatings and polymers. In general, this thesis successfully synthesized NIPU and urethane diols through a non-isocyanate approach. By further adding the NIPU with zinc phosphate pigments or crosslinking the urethane diols with HMMM crosslinkers, this thesis intends to expand the non-isocyanate method for the application in corrosion protective coatings. This work would encourage the replacement of conventional polyurethanes or urethane diols for green and environmentally friendly alternatives.
Qixin Zhou, PhD (Advisor)
Zhenmeng Peng, PhD (Committee Member)
Junpeng Wang, PhD (Committee Member)
60 p.
Chemical Engineering

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Citations

  • Huang, K.-C. (2021). Study The Application of Non-isocyanate Approach in Polyurethanes and Diols [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron161729301625948

    APA Style (7th edition)

  • Huang, Kuan-Chen . Study The Application of Non-isocyanate Approach in Polyurethanes and Diols. 2021. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron161729301625948.

    MLA Style (8th edition)

  • Huang, Kuan-Chen . "Study The Application of Non-isocyanate Approach in Polyurethanes and Diols." Master's thesis, University of Akron, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron161729301625948

    Chicago Manual of Style (17th edition)

akron161729301625948
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