흡습발열 소재를 위한 히드라진 가교 PAN 나노 입자의 제조

초록

Highly hydrophilic, hydrolyzed polyacrylonitrile (PAN) particles can be used as moisture-absorbing, heat release materials for textiles. However, its high hydrophilicity makes PAN soluble in water; therefore it should be cross-linked prior to hydrolysis. Variously sized PAN nanoparticles were synthesized by the dispersion/emulsion polymerization of acrylonitrile (AN) monomer using sodium dodecyl sulfate (SDS) and potassium persulfate as an emulsifier and an initiator, respectively. The resulting nanoparticles’ sizes, shapes, and size distributions were studied. Increasing concentrations of SDS and AN led to larger particles. PAN nanoparticles with an average size of ca. 330 nm were obtained by controlling the polymerization conditions. They were then crosslinked with hydrazine solutions of various concentrations at 110 ℃ for 3 hours. Particles’ sizes, size distributions, and thermal properties were then investigated. Crosslinking the PAN particles with hydrazine was shown not to affect the particles’ sizes or distribution and it slightly lowered the degradation and cyclization temperature of the PAN.

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