Characterization of Polysulfone and Polysulfone/Vanillin Microcapsules by 1H NMR Spectroscopy, Solid-State 13C CP/MAS–NMR Spectroscopy, and N2 Adsorption–Desorption Analyses

Textile detergent and softener industries have incorporated perfume microencapsulation technology to improve their products. Perfume encapsulation allows perfume protection until use and provides a long-lasting fragrance release. But, certain industrial microcapsules show low encapsulation capacity...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2011-11, Vol.3 (11), p.4420-4430
Main Authors: Peña, Brisa, de Ménorval, Louis-Charles, Garcia-Valls, Ricard, Gumí, Tània
Format: Article
Language:English
Subjects:
Adsorption
Benzaldehydes - chemistry
Capsules - chemistry
Delayed-Action Preparations - chemistry
Flavoring Agents - chemistry
Magnetic Resonance Spectroscopy
Nitrogen - chemistry
Perfume - chemistry
Polymers - chemistry
Sulfones - chemistry
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Summary:Textile detergent and softener industries have incorporated perfume microencapsulation technology to improve their products. Perfume encapsulation allows perfume protection until use and provides a long-lasting fragrance release. But, certain industrial microcapsules show low encapsulation capacity and low material stability. Polysulfone capsules have been already proposed to solve these drawbacks. Among them, PSf/Vanillin capsules were considered as a desirable system. They present both good material stability and high encapsulation capacity. However, several factors such as the final location of the perfume in the polymeric matrix, the aggregation state that it has in the capsule and its interaction with the capsule components have not been studied yet. These factors can provide vast information about the capsule performance and its improvement. With the aim to characterize these parameters, the physical and chemical properties of PSf/Vanillin capsules have been investigated by nuclear magnetic resonance (NMR) spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and N2 adsorption–desorption measurements. AFM micrograph and N2 isotherms confirm that the presence of vanillin modify the physical structure of PSf/Vanillin microcapsules as it is trapped in the capsule porosity. NMR results show that vanillin is present in solid state in PSf/Vanillin microcapsules.
ISSN:1944-8244
1944-8252
DOI:10.1021/am201092r