Microwave Low Temperature Plasma-initiated Polymerization Of P (amps / Nipa) Gels And Their Intelligent Textiles

In this paper, as a smart material, the P(AMPS/NIPA) dualistic hydrogel, which was new-style and intelligent, was applied to textiles to develop intelligent textiles which had both temperature and pH responsive capability. The gaps between yarns or fibers became closed or opened by means of the swelling action after absorbing water or shrinking action after releasing water of the hydrogel, which could make the performances and indexes of the modified textile(such as hydrostatic pressure, moisture permeability, gas transmission, etc.) adjusted intelligently and changed with temperature and pH value.Firstly, PAMPS hydrogel was synthesized with 2-acrylamido-2-methyl propane sulfonic acid (AMPS), which was initiated by microwave low temperature plasma. The influences of the factors on the properties of PAMPS hydrogel, such as treatment time and power of plasma, concentrations of crosslinking agent and monomer, polymerizing temperature etc, were discussed through orthogonal design. pH-sensitivity and temperature-sensitivity of PAMPS hydrogel were also investigated. The results showed that PAMPS hydrogel had higher capability of absorbing water, larger swelling ratio and stronger responsive capability to pH value.Secondly, according to the construction and characteristic of the N-isopropylacrylamide(NIPA) and the temperature-sensitivity of PNIPA hydrogel, P(AMPS/NIPA)dualistic hydrogel was synthesized by microwave low temperature plasma. The effects of the factors on the swelling characteristic of P(AMPS/NIPA) dualistic hydrogel, such as treatment time and power of plasma, concentrations of crosslinking agent and total monomers, proportion of AMPS, polymerizing temperature etc, was discussed in detail. The three dimensions structure , thermostability , reversional volume , swelling/deswelling kinetics, temperature-sensitivity and pH-sensitivity of the hydrogel were also investigated. The optimal synthesizing technics of P(AMPS/NIPA) dualistic hydrogel initiated by microwave low temperature plasma was confirmed. The investigation demonstrated that the P(AMPS/NIPA) dualistic hydrogel had large swelling ratio, good temperature-sensitivity , pH-sensitivity, swelling/deswelling reversibility and rapid responsive ability.Finally, the grafting polymerization of textile materials initiated by microwave low temperature plasma was conducted. Knitted cotton fabric was grafted by AMPS first, then knitted cotton and terylene/cotton fabrics were grafted with AMPS/NIPA dualistic monomers respectively. By means of grafting polymerization, the P(AMPS/NIPA) dualisticintelligent hydrogel was added to textile.The influences of the factors on add-on (grafting ratio), such as treatment time and power of plasma, concentrations of crosslinking agent and total monomers, proportion of AMPS, polymerizing temperature and time etc, was studied fully. The optimal conditions of grafting polymerization initiated by microwave low temperature plasma were determined by orthogonal design, variance analysis and mathematical statistics method so as to analyze the main influencing factors. Then swelling/deswelling kinetics, temperature-sensitivity and pH-sensitivity of grafted textile were studied. The performance indexes of hydrostatic pressure, moisture permeability and bursting strength of the knitted cotton and terylene/cotton fabrics before and after grafting were compared and evaluated synthetically. The results showed that after P(AMPS/NIPA) hydrogel were grafted on the textiles, good temperature-sensitivity, pH-sensitivity, swelling/deswelling reversibility and rapid responsive ability could still be obtained on the modified fabrics, but the swelling ratio declined obviously. The hydrostatic pressure of grafted fabrics increased greatly. The moisture permeability and the bursting strength of the grafted fabrics decreased slightly.