Chinese bamboo flour was chemically modified by acetylation with acetic anhydride by using trichloroacetic acid as an activation agent and the optimized condition for acetylation of bamboo flour was determined as the trichloroacetic acid amount 6.0 g per 1.5-g bamboo flour, ultrasosonication duration 40 min and the reaction time 1 h at 65°C. The composition, microstructure and thermal behavior of acetylated bamboo flour were preliminarily characterized by FT-IR, DSC and SEM etc. The acetylated bamboo flour can be molded into sheets at 130°C and 10 MPa, indicating the modified bamboo flour possesses thermalplastic performance.
Abstrat:The bamboo powder/polycaprolactone composites (BPPC) were prepared by torque-rheometer to investigate the effects of recipes and processing conditions on the rheological properties of BPPC. The morphological behavior and mechanical properties of BPPC were also studied. Results showed that the optimum recipe for composite materials is composed of 70% of polycaprolactone, 30% of bamboo powder according to volume, 1.6 % of aluminate coupling agent, 1.2% of stearic acid, and 2% of paraffin to bamboo powder according to mass ratio.The optimum processing condition parameters were determined as the rotational speed at 50 r·min -1 and the temperature at 100ºC for BPPC.The BPPC (containing 30 copies bamboo powder) possessed eminent interfacial compatibility and mechanical properties of BPPC.
We have developed a noninvasive method to monitor the glucose concentration in tissue phantom used the OCT model which based on the extended Huygens-Fresnel (EHF) principle. The changes of the optical properties such as the scattering coefficient s µ , the anisotropy factor g and the effective scattering coefficient ' s µ with the increase of the glucose concentration in 10% Intralipid solution were obtained. The results showed that the scattering coefficient s µ decreased when the glucose concentration increased in the solution, which is accorded with the conclusions by others.Contrarily, the factor g increased when the glucose concentration grown up. As a result, the coefficient ' s µ is fall with the increased of the glucose concentration. Comparing with those previously reported in which only got the relative value of scattering coefficient s µ , the most important advantage of our model is that we got the practical value of s µ , g and ' s µ . All of these reveal that the OCT EHF model is a promising method which is adapted to detect the glucose concentration in solution, and it will be applied in medical fields someday.
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