Abstract
We herein report the preparation of phase change nanocapsules with undecanoic acid (UA) as the core and a styrene–butyl acrylate copolymer as the shell by miniemulsion polymerization using interfacial redox initiation. The morphology, particle size, thermal properties, and structure of the nanocapsules were characterized by transmission electron microscopy, differential scanning calorimetry, and thermogravimetric analysis. Further, the cotton fiber was dissolved in hydroxyl-functionalized ionic liquid 1-(3-chloro-2-hydroxypropyl)-3-methyl imidazolium chloride, and then the nanoencapsulated UA was immobilized on the cotton fiber by mixing the solution with the phase change nanocapsule emulsion. The desired thermoregulating fabrics were then recovered by vacuum suction filtration and drying, and their surface morphologies and thermoregulating properties were evaluated. The nanocapsules were found to be of a regular spherical shape with a diameter ranging from 90 to 110 nm, and they exhibit a phase change temperature of 29.3 °C. Finally, the prepared thermoregulating non-woven fabrics exhibited excellent thermal reliability, air permeability, and thermoregulating capability.
Highlights
Thermoregulating fabrics are a kind of intelligent textile that provide an appropriate response to external temperature changes,[1,2] where the degree of thermal comfort of the textile depends on the heat exchange between the human body and the surrounding environment
The highest nanocapsule encapsulation efficiency was obtained (99.3 wt%, calculated using eqn (1)) when a monomer/undecanoic acid (UA) mass ratio of 1 : 1 was employed. These results indicate that the St–BA–MA copolymer could effectively encapsulate UA phase change material (PCM) by miniemulsion polymerization using
We determined the air resistance values of the thermoregulating non-woven fabrics and pure cotton spunlace nonwoven fabric to be 2032 and 2322 mm sÀ1, respectively. These results indicate that the air permeability of the thermoregulating non-woven fabrics is lower than that of the cotton spunlace nonwoven fabric, likely due to the processing techniques involved
Summary
Thermoregulating fabrics are a kind of intelligent textile that provide an appropriate response to external temperature changes,[1,2] where the degree of thermal comfort of the textile depends on the heat exchange between the human body and the surrounding environment. The redox interfacial initiation miniemulsion polymerization was carried out according to a previously reported technique.[20] More speci cally, the oil phase containing St (10 g), BA (0.8 g), MA (0.2 g), the desired quantity of UA, HD (0.4 g), and BPO (0.24 g) were stirred for 30 min at ambient temperature.
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