(144e) Surfactant Migration on Polymeric Substrates | AIChE

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(144e) Surfactant Migration on Polymeric Substrates

Authors 

Ramadani, J. - Presenter, Imperial College London
Williams, D., Imperial College London
Caputi, M., Procter & Gamble Service GmbH
Ambrogio, I., Procter & Gamble GLIC UK
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Shin Mukai Normal Cody Hirashima 2 16 2019-04-19T14:22:00Z 2019-04-19T14:22:00Z 1 422 2410 20 5 2827 16.00

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Surfactant
Migration on Polymeric Substrates normal">

Jona
Ramadani*1
Daryl Williams1, Mariangela Caputi2 and Ilaria Ambrogio3

1Department of Chemical
Engineering, Imperial College, Kensington, London SW7 2BY  

2Procter &
Gamble Service GmbH, 3Procter & Gamble GLIC UK

*Corresponding
author, e-mail 10.0pt;font-family:" times new roman>jr3317@ic.ac.uk

Surfactants are commonly used to modify the surface
chemistry of materials, including nonwoven fabrics formed from polyethylene and
polypropylene fibre blends which used extensively in the personal care
industry. Industrial experience is that the surface hydrophilicity of these
materials is time dependent, and significant losses in surface concentrations
of surfactants have been observed. The final fate and mechanisms by which
surfactants are lost are currently unknown. This research aims to develop a
fundamental understanding of the surfactant loss process(es) which are
responsible for aging of surfactant treated nonwoven fabrics. Confocal Laser Fluorescence
Microscopy (CLFM) has been used here for the first time to map surfactant
distribution across polymeric fibres and for in-depth profiling studies. CLFM allows imaging inside
reasonably thick samples, thus facilitating the visualization of the chemicals
of interest within multi-layer solid systems. 10.0pt;font-family:" arial> CLFM
has been used in this study to visualize surfactants. Fluorophores are sublimated
onto the nonwoven fabrics font-family:" arial>where they partition into the surfactant
species. The CLFM images shows the location
of the fluorescence dye which we know has higher affinity for the surfactants
than the polymeric fibre and therefore the method can successfully map the
distribution of the surfactants through the complex 3D polymer substrates.




absolute;z-index:251659264;left:0px;margin-left:139px;margin-top:312px;
width:235px;height:235px"> 10.0pt;font-family:" arial>Figure 1 shows
an example of a nonwoven fabric without surfactant coating, (i.e. hydrophobic)
which exhibited no fluorophores uptake (1a) whilst in the case of surfactant treated
samples the clear presences of the fluorophores, shown as green colour, on the
fabric was revealed by CLFM font-family:" arial> font-family:" arial>(1b). The presence of
hydrophilic fluorophores is assumed to be associated with presence of
surfactants, thus inferring their location on the sample surface. Hydrophilic
fluorophores showed higher affinity for the surfactant treated samples than for
the untreated samples suggesting the presence of surfactants on the surfactant treated
samples.

                    

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normal">Figure 1 CLFM
images of fluorophore coated a) untreated nonwoven
fabric and b) surfactant treated nonwoven fabric

This
research will help with the fundamental understanding of the science governing
surfactant-polymer interactions. Such knowledge is invaluable as it can be used
to solve similar problems concerning all industries with products which have as
their base material a polymeric substrate coated with surfactant(s). 11.0pt;font-family:" times new roman>

Topics 

Interfacial Phenomena

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