Assessment of Thermal Performance of Textile Materials Modified with PCM Microcapsules Using Combination of DSC and Infrared Thermography Methods.

Alicja Nejman,Irena Kamińska,Małgorzata Cieślak,Ewa Gromadzińska

doi:10.3390/molecules25010122

Abstract

The aim of the study was the combination of two measurement methods, the differential scanning calorimetry (DSC) and infrared thermography to evaluate thermal performance of woven and knitted fabrics coated with acrylic pastes containing 20% (P/20) and 40% (P/40) of microcapsules of phase change materials (MPCM) with transition temperatures of 28 °C (MPCM28) and 43 °C (MPCM43). The DSC analysis showed that the phase transition processes for materials modified with pastes P/20 occur in a narrower temperature range than those modified with P/40 pastes. The initial temperatures TOnset (S-S) and TOnset (S-L) are higher for materials modified respectively with pastes P/20 and P/40. The melting and crystallization enthalpy values of both P/20 coated materials are lower by about 45% and 35% compared to P/40. Infrared thermography analysis showed that materials modified with P/20 are heating up faster than modified with P/40 for both MPCM. In the cooling process for modified fabrics the highest temperature decrease was observed in the first 30s. Materials modified with paste P/40 were cooled more slowly in comparison with paste P/20, both for MPCM28 and MPCM43.

Highlights

One of the possible ways of producing functional textile materials is the incorporation of the modifiers in the microcapsules form [1,2,3,4,5,6,7,8,9,10,11] into the material structure, in which many active substances can be entrapped
The W fabric with paste pastes containing 20% (P/20) (Figure 1b) is covered with a thin layer of microcapsules of phase change materials (MPCM) paste as evidenced by many fibers protruding above the modified surface
The differential scanning calorimetry (DSC) analysis and infrared thermography technique was used to evaluate thermal properties of woven and knitted fabrics modified with phase change materials (PCM) microcapsules with phase transition temperature of 28 ◦ C and 43 ◦ C under the same conditions

Summary

Introduction

One of the possible ways of producing functional textile materials is the incorporation of the modifiers in the microcapsules form [1,2,3,4,5,6,7,8,9,10,11] into the material structure, in which many active substances can be entrapped. One of the groups of such substances are phase change materials (PCM), which can shape thermoregulatory performance and improve thermal comfort. They have the ability to absorb and store large amounts of heat during heating and its releasing during cooling. Phase change materials may be organic compounds (alkanes) or inorganic compounds (e.g., hydrated inorganic salts) [12,13]. About 500 potential phase change materials are known [5]. Alkanes with a carbon number from 16 to 20, such as n-Hexadecane (Tm = 18.2 ◦ C), n-Heptadecane (Tm = 22.5 ◦ C), n-Octadecane (Tm = 28.2 ◦ C), n-Nonadecane (Tm = 32.1 ◦ C) or n-Eicosan (Tm = 36.1 ◦ C) are the most often used.

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