title: Novel hydrophobic hemicelluloses: synthesis and characteristic.
abstract: Novel hydrophobic hemicelluloses possessing hydrophobic groups were prepared by the benzylation of wheat straw hemicelluloses with benzyl chloride under the presence of catalyst in an ethanol/water system. In particular, the progress of the benzylation reaction was studied as a function of the volume ratio of ethanol/water from 4:1 to 6:4, the molar ratio of NaOH/anhydroxylose unit in hemicelluloses from 0.6:1 to 1.5:1, the molar ratio of benzyl chloride/anhydroxylose unit in hemicelluloses from 0.5:1 to 2.0:1, reaction temperature 50-80 °C, and reaction time 4-20 h Benzylated hemicelluloses with the low degree of substitution from 0.09 to 0.35 were obtained depending on the experimental conditions. The incorporation of benzyl groups into the backbone of hemicelluloses was confirmed by FT-IR and (13)C NMR spectroscopies. The thermal stability increased after the modification of hemicelluloses due to the introduction of benzyl groups. The introduction of benzyl groups endows hemicelluloses with the hydrophobicity, which could be potentially applied in plastic industries.
authors.affiliation: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; Key Laboratory of Renewable Energy and Gas Hydrate, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Ren
authors.initials: R
authors.lastname: Junli
authors.affiliation: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Xinwen
authors.affiliation: Institute of Biomass Chemistry and Technology, Beijing Forestry University, Beijing 100083, China.
authors.forename: Zhong
authors.initials: Z
authors.lastname: Linxin
authors.affiliation: Institute of Biomass Chemistry and Technology, Beijing Forestry University, Beijing 100083, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Feng
authors.affiliation: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; Institute of Biomass Chemistry and Technology, Beijing Forestry University, Beijing 100083, China.
authors.forename: Sun
authors.initials: S
authors.lastname: Runcang
mesh_terms: D001593:Benzyl Compounds / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D009682:Magnetic Resonance Spectroscopy; D011134:Polysaccharides / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry
chemical_list: D001593:Benzyl Compounds; D011134:Polysaccharides; C007916:hemicellulose; C021292:benzyl chloride