Cellulosic fibres from coffee(CF)and rice(RF)husks have been obtained applying chemical treatments and characterized as to their microstructure and thermal behaviour.These materials have been incorporated into glycero...Cellulosic fibres from coffee(CF)and rice(RF)husks have been obtained applying chemical treatments and characterized as to their microstructure and thermal behaviour.These materials have been incorporated into glycerol plasticised thermoplastic starch(TPS)films obtained by melt blending and compression moulding at 1 wt%,5 wt%and 10 wt%.Microstructure,thermal behaviour and optical,tensile and barrier properties of the composites were analysed.Both kinds of micro-fibres improve the film stiffness while reduced the film stretchability.However,CF better maintained the film ductility at 1 and 5 wt%.A network of fine oriented fibres was observed on the surface of the films,while internal fibres exhibited a good adherence to the polymer network.The water vapour permeability of TPS films was not reduced in composites,although oxygen permeability was lowered by about 17%.Film transparency decreased by fibre addition in the UVVIS range.Thermal stability of composites was slightly higher than net TPS films.展开更多
Cobalt tetra（N-carrbonylacrylic） aminophthalocyanine was supported on cellulose fibres by graft reaction to obtain a novel polymer catalyst, catalytic cellulose fibres （CCF）, and the optimal supporting conditions ...Cobalt tetra（N-carrbonylacrylic） aminophthalocyanine was supported on cellulose fibres by graft reaction to obtain a novel polymer catalyst, catalytic cellulose fibres （CCF）, and the optimal supporting conditions were pH = 6,80℃, t = 120 min. The catalytic oxidation activity of CCF towards oxidation of 2-mercaptoethanol （MEA） in aqueous solution was investigated. The experimental results demonstrated that CCF had good catalytic oxidation activity on MEA at room temperature, causing no secondary pollution and remaining efficient for the repetitive tests with no obvious decrease of catalytic activity.展开更多
Adsorption isotherms for SF cellulase from Trichoderma pssudokoningii on cotton, flax and viscose yarns were investigated to provide information about cellulase-cellulose binding on different types of cellulosic fibre...Adsorption isotherms for SF cellulase from Trichoderma pssudokoningii on cotton, flax and viscose yarns were investigated to provide information about cellulase-cellulose binding on different types of cellulosic fibres. The half-saturation constants and maximum adsorption constants suggest that SF cellulase has greater affinity for viscose than for cotton and greater affinity for cotton than for flax. It is suggested that this is related to the different crystallinities and microporous structures of these fibre types. The fraction of adsorbable protein in the total cellulase was found to be the same for each of the three cellulase substrates.展开更多
文摘Cellulosic fibres from coffee(CF)and rice(RF)husks have been obtained applying chemical treatments and characterized as to their microstructure and thermal behaviour.These materials have been incorporated into glycerol plasticised thermoplastic starch(TPS)films obtained by melt blending and compression moulding at 1 wt%,5 wt%and 10 wt%.Microstructure,thermal behaviour and optical,tensile and barrier properties of the composites were analysed.Both kinds of micro-fibres improve the film stiffness while reduced the film stretchability.However,CF better maintained the film ductility at 1 and 5 wt%.A network of fine oriented fibres was observed on the surface of the films,while internal fibres exhibited a good adherence to the polymer network.The water vapour permeability of TPS films was not reduced in composites,although oxygen permeability was lowered by about 17%.Film transparency decreased by fibre addition in the UVVIS range.Thermal stability of composites was slightly higher than net TPS films.
基金National Natural Science Foundation of China ( No.20574061)Program for New Century Excellent Talents in University (NCET-04-0559)+1 种基金Specialized Research Fund for the Doctoral Program of Higher Education (20060338002)Program for Changjiang Scholars Innovative Research Team in University (IRT0654)
文摘Cobalt tetra（N-carrbonylacrylic） aminophthalocyanine was supported on cellulose fibres by graft reaction to obtain a novel polymer catalyst, catalytic cellulose fibres （CCF）, and the optimal supporting conditions were pH = 6,80℃, t = 120 min. The catalytic oxidation activity of CCF towards oxidation of 2-mercaptoethanol （MEA） in aqueous solution was investigated. The experimental results demonstrated that CCF had good catalytic oxidation activity on MEA at room temperature, causing no secondary pollution and remaining efficient for the repetitive tests with no obvious decrease of catalytic activity.
文摘Adsorption isotherms for SF cellulase from Trichoderma pssudokoningii on cotton, flax and viscose yarns were investigated to provide information about cellulase-cellulose binding on different types of cellulosic fibres. The half-saturation constants and maximum adsorption constants suggest that SF cellulase has greater affinity for viscose than for cotton and greater affinity for cotton than for flax. It is suggested that this is related to the different crystallinities and microporous structures of these fibre types. The fraction of adsorbable protein in the total cellulase was found to be the same for each of the three cellulase substrates.
