Shape Memory Nanocomposite-Based Thermal-Moisture Sensitive Cellulosic Textiles

Korkmaz Memiş N., Kaplan S., Kertmen M.

50th Textile Research Symposium (TRS50), Moka, Mauritius, 7 - 09 Eylül 2023, ss.1, (Tam Metin Bildiri)

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Basıldığı Şehir: Moka
  • Basıldığı Ülke: Mauritius
  • Sayfa Sayıları: ss.1
  • Süleyman Demirel Üniversitesi Adresli: Evet

Özet

Shape memory polymer based thermal and moisture responsive fabrics are becoming a very promising solution for personal thermal comfort with self-adaptive function to respond to real-time changes of body micro-climate and external environment. Both in filament of fabric coating forms, thermal and moisture responsive function is achieved at both microscopic and macroscopic scales by adjusting molecular chains mobility, hence porosity of the structure. Besides common structures responsive to one stimulus; temperature and humidity, multimode shape memory textiles responsive to more than stimulus simultaneously have been needed recently in generally nanocomposite form including different stimuli-responsive components. Herein, dual-responsive cellulosic knitted fabrics (cotton, viscose, modal, lyocell, bamboo) having dynamic breathability function were developed with temperature-moisture responsive nanocomposite finishing treatment by a pad-dry-cure process. Having its intrinsic temperature response function, shape memory polyurethane (SMPU) was reinforced with cellulose nanowhiskers (CNW) to create percolation network for additional moisture responsive function. Dynamic breathability function was tested with water vapour permeability (WVP) tests under different temperature (20°C-40°C) and relative humidity (40%, 60%) environments. According to the results, treated cellulosic fabrics, especially modal exhibited adaptive WVP. The mentioned temperature-responsive function can be attributed to the free volume increasing soft segment, micro-Brownian motion opening transfer channels 40°C above Tg=32°C of SMPU polymer and additional micropores and free volume created by CNWs within SMPU matrix. Disrupting hydrogen bonds among CNWs by water molecules which increases porosity at higher moisture levels is the reason of moisture-responsive function. Optimization of fabric hand, which was one of the aims, is crucial for such kind of cellulosic fabrics that 1.31x bending rigidity increment was achieved for modal. SEM and FT-IR analysis results confirmed coating and fabric-nanocomposite interactions in turn. Summing up, modal fabric can be suggested for a next-to-skin clothing having dynamic breathability keeping its superior hand.