功能性纺织品论文.ppt

Contents Introduction Experimental Results and discussion—synthesis Results and discussion—Immobilization of the particles onto PLA fabric by UV irradiation Results and discussion—Immobilization of the particles onto PLA fabric by UV irradiation Results and discussion—hydrophobicity of PLA fabrics Conclusions * Superhydrophobic PLA fabrics prepared by UV photo-grafting of hydrophobic silica particles possessing vinyl groups Introduction 1 Experimental part 2 Results and discussion 3 Conclusions 4 3 1 2 Why we need superhydrophobicity? Why chose silica particles possessing vinyl groups? What is PLA? Synthesis of silica particles UV photo-grafting onto PLA Characterization UV photo-grafting of silica particles possessing vinyl groups onto PLA fabric FT-IR SEM TGA Water contact angle Sol-gel process Fig. 1. SEM images of silica particles with vinyl groups. Fig.2. FT-IR spectrum of silica particles with vinyl groups. Fig. 3. TGA thermograms of the pristine PLA fabric and the silica particles possessing vinyl groups. 17.5% weight loss 100% weight loss Fig. 4. TGA thermograms of PLA fabrics prepared with various treatments. Fab-P: 2.56% residue indicates that the content of particles on PLA was 2.96% (caculated with Fig. 3). Fab-PUW: 2.44% residue means that 86% of the particles were immobilized. Fab-PW:1.22% residue means that most of the particles were washed out. Fig. 5. SEM images of the PLA-PUW. Fig. 6. Optical micrographs of water droplets onto the PLA fabrics: (a) fabric treated with the silica particles, and (b) pristine fabric. 3 4 1 2 Spherical silica particles possessing vinyl groups were synthesized via sol-gel process. The silica particles were successfully grafted on the PLA fabric surfaces PLA fabrics treated via UV photo-grafting could obtain superhydrophobicity and a water contact angle of ~150°. The UV photo-grafting of silica particles possessing vinyl groups onto PLA fabric is an efficient one-step process to provide sur