Emulsion Stabilization Strategies for Tailored Isocyanate Microcapsules

We report on the stabilization of an oil-in-water (O/W) emulsion to, combined with interfacial polymerization, produce core–shell polyurea microcapsules (MCs) containing isophorone diisocyanate (IPDI). These will act as crosslinkers for mono-component adhesives. The emulsion stabilization was evalua...
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Gespeichert in:

Autor*in:	Mónica V. Loureiro [verfasserIn] António Mariquito [verfasserIn] Mário Vale [verfasserIn] João C. Bordado [verfasserIn] Isabel Pinho [verfasserIn] Ana C. Marques [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	microcapsules emulsion O/W polyvinyl alcohol interfacial polymerization

Übergeordnetes Werk:	In: Polymers - MDPI AG, 2011, 15(2023), 2, p 403
Übergeordnetes Werk:	volume:15 ; year:2023 ; number:2, p 403

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/polym15020403

Katalog-ID:	DOAJ081718330

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callnumber-first	Q - Science
author	Mónica V. Loureiro
spellingShingle	Mónica V. Loureiro misc QD241-441 misc microcapsules misc emulsion misc O/W misc polyvinyl alcohol misc interfacial polymerization misc Organic chemistry Emulsion Stabilization Strategies for Tailored Isocyanate Microcapsules
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topic_title	QD241-441 Emulsion Stabilization Strategies for Tailored Isocyanate Microcapsules microcapsules emulsion O/W polyvinyl alcohol interfacial polymerization
topic	misc QD241-441 misc microcapsules misc emulsion misc O/W misc polyvinyl alcohol misc interfacial polymerization misc Organic chemistry
topic_unstemmed	misc QD241-441 misc microcapsules misc emulsion misc O/W misc polyvinyl alcohol misc interfacial polymerization misc Organic chemistry
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title	Emulsion Stabilization Strategies for Tailored Isocyanate Microcapsules
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title_full	Emulsion Stabilization Strategies for Tailored Isocyanate Microcapsules
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author_browse	Mónica V. Loureiro António Mariquito Mário Vale João C. Bordado Isabel Pinho Ana C. Marques
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title_sort	emulsion stabilization strategies for tailored isocyanate microcapsules
callnumber	QD241-441
title_auth	Emulsion Stabilization Strategies for Tailored Isocyanate Microcapsules
abstract	We report on the stabilization of an oil-in-water (O/W) emulsion to, combined with interfacial polymerization, produce core–shell polyurea microcapsules (MCs) containing isophorone diisocyanate (IPDI). These will act as crosslinkers for mono-component adhesives. The emulsion stabilization was evaluated using three types of stabilizers, a polysaccharide (gum arabic) emulsifier, a silicone surfactant (Dabco<sup<®</sup<DC193), a rheology modifier (polyvinyl alcohol), and their combinations. Emulsion sedimentation studies, optical microscopy observation, and scanning electron microscopy enabled us to assess the emulsions stability and droplet size distribution and correlate them to the MCs morphology. Fourier transform infrared spectroscopy and thermogravimetric analysis revealed the MCs composition and enabled us to evaluate the encapsulation yield. All stabilizers, except DC193, led to spherical, loose, and core–shelled MCs. The rheology modifier, which increases the continuous phase viscosity, reduces the emulsion droplets sedimentation, keeping their size constant during the MCs’ synthesis. This allowed us to obtain good quality MCs, with a smaller average diameter, of approximately 40.9 µm mode, a narrower size distribution and 46 wt% of encapsulated IPDI. We show the importance of the emulsion stability to tune the MCs morphology, size, and size distribution, which are critical for improved homogeneity and performance when used, e.g., in natural and synthetic adhesive formulations industry.
abstractGer	We report on the stabilization of an oil-in-water (O/W) emulsion to, combined with interfacial polymerization, produce core–shell polyurea microcapsules (MCs) containing isophorone diisocyanate (IPDI). These will act as crosslinkers for mono-component adhesives. The emulsion stabilization was evaluated using three types of stabilizers, a polysaccharide (gum arabic) emulsifier, a silicone surfactant (Dabco<sup<®</sup<DC193), a rheology modifier (polyvinyl alcohol), and their combinations. Emulsion sedimentation studies, optical microscopy observation, and scanning electron microscopy enabled us to assess the emulsions stability and droplet size distribution and correlate them to the MCs morphology. Fourier transform infrared spectroscopy and thermogravimetric analysis revealed the MCs composition and enabled us to evaluate the encapsulation yield. All stabilizers, except DC193, led to spherical, loose, and core–shelled MCs. The rheology modifier, which increases the continuous phase viscosity, reduces the emulsion droplets sedimentation, keeping their size constant during the MCs’ synthesis. This allowed us to obtain good quality MCs, with a smaller average diameter, of approximately 40.9 µm mode, a narrower size distribution and 46 wt% of encapsulated IPDI. We show the importance of the emulsion stability to tune the MCs morphology, size, and size distribution, which are critical for improved homogeneity and performance when used, e.g., in natural and synthetic adhesive formulations industry.
abstract_unstemmed	We report on the stabilization of an oil-in-water (O/W) emulsion to, combined with interfacial polymerization, produce core–shell polyurea microcapsules (MCs) containing isophorone diisocyanate (IPDI). These will act as crosslinkers for mono-component adhesives. The emulsion stabilization was evaluated using three types of stabilizers, a polysaccharide (gum arabic) emulsifier, a silicone surfactant (Dabco<sup<®</sup<DC193), a rheology modifier (polyvinyl alcohol), and their combinations. Emulsion sedimentation studies, optical microscopy observation, and scanning electron microscopy enabled us to assess the emulsions stability and droplet size distribution and correlate them to the MCs morphology. Fourier transform infrared spectroscopy and thermogravimetric analysis revealed the MCs composition and enabled us to evaluate the encapsulation yield. All stabilizers, except DC193, led to spherical, loose, and core–shelled MCs. The rheology modifier, which increases the continuous phase viscosity, reduces the emulsion droplets sedimentation, keeping their size constant during the MCs’ synthesis. This allowed us to obtain good quality MCs, with a smaller average diameter, of approximately 40.9 µm mode, a narrower size distribution and 46 wt% of encapsulated IPDI. We show the importance of the emulsion stability to tune the MCs morphology, size, and size distribution, which are critical for improved homogeneity and performance when used, e.g., in natural and synthetic adhesive formulations industry.
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title_short	Emulsion Stabilization Strategies for Tailored Isocyanate Microcapsules
url	https://doi.org/10.3390/polym15020403 https://doaj.org/article/9a1831e6dbb448e2b55f26767aadbe46 https://www.mdpi.com/2073-4360/15/2/403 https://doaj.org/toc/2073-4360
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up_date	2024-07-03T21:31:51.383Z
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Emulsion Stabilization Strategies for Tailored Isocyanate Microcapsules

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