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Keywords
(12)
Absorptive Capacity
Chemical Composition
Differential Scanning Calorimetry
Moisture Content
Relative Humidity
Scanning Electron Microscopy
Surface Layer
Surface Morphology
Water Vapour
X Ray Photoelectron Spectroscopy
Acrylic Acid
Lower Critical Solution Temperature
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Moisture absorption capacity of polyamide 6,6 fabrics surface functionalised by chitosan-based hydrogel finishes
Moisture absorption capacity of polyamide 6,6 fabrics surface functionalised by chitosan-based hydrogel finishes,10.1016/j.porgcoat.2011.06.019,Progre
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Moisture absorption capacity of polyamide 6,6 fabrics surface functionalised by chitosan-based hydrogel finishes
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Pelagia Glampedaki
,
Dragan Jocic
,
Marijn M. C. G. Warmoeskerken
The present study aims at investigating the moisture absorption capacity of polyamide 6,6 fabrics when their surface is functionalised by chitosan-based hydrogels. For the finishing procedure, bulk hydrogels of chitosan (CS) with different contents of embedded thermosensitive microparticles of poly(N-isopropylacrylamide-co-acrylic acid) (PNIAA) were used. In practice, hydrogel incorporation into the fabric
surface layer
was achieved by crosslinking primary amine groups of chitosan with the end amine groups of polyamide, using the natural crosslinker genipin. Among other analytical techniques,
Scanning Electron Microscopy
(SEM) was used to characterize the
surface morphology
of both hydrogel and fabric samples,
Differential Scanning Calorimetry
(DSC) to determine the
Lower Critical Solution Temperature
(LCST) of PNIAA, and X-ray
Photoelectron Spectroscopy
(XPS) to analyse the fabric surface chemical composition. The fabric moisture contents were determined by weight measurements at different temperatures and
relative humidity
values (RH). Liquid porosimetry,
water vapour
transmission (WVT) and dynamic wetting measurements were also performed to assess the fabric pore volume distribution, permeability and wetting times, respectively. It was found that the moisture absorbed by the functionalised polyamide fabrics can be regulated at different conditions of temperature and
relative humidity
according to the PNIAA/CS ratio in the hydrogel. For example, at 40°C (i.e. above the PNIAA LCST) and even at high RH (85%), the higher the PNIAA/CS ratio was in the incorporated hydrogel, the lower were the moisture contents of the functionalised fabrics, compared to the reference. In all cases, the presence of CS increased significantly the polyamide fabric wetting times.
Journal:
Progress in Organic Coatings - PROG ORG COATING
, vol. 72, no. 3, pp. 562-571, 2011
DOI:
10.1016/j.porgcoat.2011.06.019
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