title: Transparent cellulose/polyhedral oligomeric silsesquioxane nanocomposites with enhanced UV-shielding properties.
abstract: The solubility of eight types of polyhedral oligomeric silsesquioxane (POSS) derivatives in an ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl) and the dispersion of POSS in cellulose matrix were examined. Only a special POSS containing both aminophenyl and nitrophenyl groups (POSS-AN, NH2:NO2=2:6) was selected to prepare nanocomposites, because of its good solubility in AmimCl and high stability during the preparation process. POSS-AN nanoparticles were uniformly dispersed in a cellulose matrix with a size of 30-40nm, and so the resultant cellulose/POSS-AN nanocomposite films were transparent. The mechanical properties of the films achieved a maximum tensile strength of 190MPa after addition of 2wt% POSS-AN. Interestingly, all of the cellulose/POSS-AN films exhibited high UV-absorbing capability. For the 15wt% cellulose/POSS-AN film, the transmittance of UVA (315-400nm) and UVB (280-315nm) was only 9.1% and nearly 0, respectively. The UV aging and shielding experiments showed that the transparent cellulose/POSS-AN nanocomposite films possessed anti-UV aging and UV shielding properties.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Feng
authors.affiliation: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China. Electronic address: zhjm@iccas.ac.cn.
authors.forename: Jinming
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China.
authors.forename: Jiasong
authors.initials: J
authors.lastname: He
authors.affiliation: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China. Electronic address: jzhang@iccas.ac.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D006244:Hardness; D008422:Materials Testing; D053761:Nanocomposites / Q000737:chemistry*; D017646:Organosilicon Compounds / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D017646:Organosilicon Compounds; D002482:Cellulose
keywords: Anti-UV aging; Cellulose nanocomposite; POSS; UV-shielding