The Effects of Urethane Methacrylates on the Film Properties of Acrylic-Urethane Hybrid Latexes

Bibliographic Details
Main Author:	Cobaj, Anisa
Language:	English
Published:	University of Akron / OhioLINK 2019
Subjects:	Polymer Chemistry Polymers
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=akron1560335362557041

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-akron15603353625570412021-08-03T07:11:21Z The Effects of Urethane Methacrylates on the Film Properties of Acrylic-Urethane Hybrid Latexes Cobaj, Anisa Polymer Chemistry Polymers Latexes are stable aqueous dispersions of polymeric particles prepared via emulsion polymerization process. The requirements of high performing latex are to have good mechanical properties and a smooth film formation. To achieve the required balance, polymer composition and polymer morphology of latexes has been modified. A urethane methacrylate monomer, (MEM) was synthesized via a non-isocyanate pathway and incorporated into acrylic-urethane hybrid latexes via seeded semi-continuous monomer starved polymerization. Acrylic-urethane hybrid latexes were prepared by copolymerization of MEM with MMA and BA in homogeneous and core-shell latexes. Particle size and morphology was evaluated by DLS, TEM and AFM. The behavior of urethane monomer in acrylic latexes and the effect of urethane functionalized latexes on film formation, viscoelastic and mechanical properties was studied via MFFT, DMTA, tensile and coatings testing. Hydrogen bonding of urethanes with water had a plasticizing effect during film formation. As a result, Tg-MFFT of acrylic-urethane latexes was higher than that of acrylic latexes. In comparison to the control acrylic latex, acrylic-urethane hybrids showed improvement in viscoelastic properties and in mechanical properties as function of MEM concentration in latexes. Moreover, core-shell latexes outperformed homogeneous latexes. Hydrogen bonding of MEM functionalized homogeneous and core-shell latexes was quantified via ATR-FTIR. With more MEM in the homogeneous and core-shell latexes, hydrogen bonding strength was enhanced, which was displayed by the frequency shift of both N-H and C=O stretching bands and by increase in the area of the hydrogen bonded N-H and C=O stretching bands. Fraction of hydrogen bonded C=O groups was calculated and compared for the homogeneous and core-shell latexes as a function of increasing MEM concentration in latex.A simplistic method to synthesize urethane methacrylate monomers without purification was used to prepare MEM and methacrylic acid. MEM and MAA functionalized homogeneous latex systems were prepared via seeded semi-continuous monomer starved conditions. Particle size, particle size distribution and morphology of latexes was evaluated via DLS and AFM. Film formation, viscoelastic and mechanical properties of acrylic-urethane hybrid latexes were examined and the film properties were dependent on the concentration of MEM and MAA monomers in latex. A composition drift was observed for high MEM+MAA concentration in latexIn the last chapter, a di-urethane methacrylate monomer (HHM) was synthesized via the isocyanate pathway and copolymerized with MMA and BA in a homogeneous latex. Film formation, viscoelastic and mechanical properties were improved with higher functionality of HHM in the system. Particle size of latex was increased with higher HHM concentration in latex. When keeping Tg the same, lower MFFT was observed as the amount of HHM in latex increased. 2019-08-29 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1560335362557041 http://rave.ohiolink.edu/etdc/view?acc_num=akron1560335362557041 restricted--full text unavailable until 2024-08-20 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
spellingShingle	Polymer Chemistry Polymers Cobaj, Anisa The Effects of Urethane Methacrylates on the Film Properties of Acrylic-Urethane Hybrid Latexes
author	Cobaj, Anisa
author_facet	Cobaj, Anisa
author_sort	Cobaj, Anisa
title	The Effects of Urethane Methacrylates on the Film Properties of Acrylic-Urethane Hybrid Latexes
title_short	The Effects of Urethane Methacrylates on the Film Properties of Acrylic-Urethane Hybrid Latexes
title_full	The Effects of Urethane Methacrylates on the Film Properties of Acrylic-Urethane Hybrid Latexes
title_fullStr	The Effects of Urethane Methacrylates on the Film Properties of Acrylic-Urethane Hybrid Latexes
title_full_unstemmed	The Effects of Urethane Methacrylates on the Film Properties of Acrylic-Urethane Hybrid Latexes
title_sort	effects of urethane methacrylates on the film properties of acrylic-urethane hybrid latexes
publisher	University of Akron / OhioLINK
publishDate	2019
url	http://rave.ohiolink.edu/etdc/view?acc_num=akron1560335362557041
work_keys_str_mv	AT cobajanisa theeffectsofurethanemethacrylatesonthefilmpropertiesofacrylicurethanehybridlatexes AT cobajanisa effectsofurethanemethacrylatesonthefilmpropertiesofacrylicurethanehybridlatexes
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The Effects of Urethane Methacrylates on the Film Properties of Acrylic-Urethane Hybrid Latexes

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