Study On Rheological Properties Variation Rule Of Bamboo

In this paper, moso bamboo is the raw material. Drainage method is used to determine the basicdensity of different moso bamboo age, Using sulfate lignin (Klason lignin) quantitative determination ofbamboo lignin content, cellulose crystallinity was tested by X-ray diffraction (XRD) method, Thedynamic thermal mechanical analysis (DMA) technique was developed for the determination of bambooglass transition temperature, summary and analysis the variation law of each index. Discusses theoptimal partition of orderly clustering method is used to define the bamboo juvenile wood and maturewood age boundaries. According to bamboo juvenile wood age range, and the dynamic thermalmechanical analyzer (DMA Q800) test: bending dynamic viscoelasticity and creep properties, exploringstage of juvenile wood rheology change properties of moso bamboo. Get the following results:(1)on the whole with the growth of the age of bamboo, the density of bamboo presented increasingtrend, the radial variation of the densities of moso bamboo was the outer were maximum and the innerwere minimum. The longitudinal variation was the densities increased gradually from bottom to top.(2)Lignin content presented increasing trend with age, Lignin content in the longitudinal partwithout obvious regularity; The radial position changes from outside to inside decreases gradually.(3)The change of crystallinity with bamboo age for bamboo flesh and tabasheer1year to2yearsgave birth to the crystallinity of a significant decline. Bamboo green only a drop in the amplitude of thesmall, after all parts present a first down later fluctuations; Longitudinal position change has no obviousregularity of crystallinity; Radial positions inside and outside a gradual increase in the change trend ofcrystallinity(4)Glass transition temperature of1year to2years between the obvious drop, then grow alongwith the age of bamboo, showed a trend of fluctuations. Along the longitudinal height, no unifiedchange rule; Along the radial bamboo wall, from outside to inside is gradually decreasing trend.(5)Through integrated the relevant indicators, using the method of optimal partition of ordered, theage limit of juvenile wood and mature wood for5a.(6)Storage modulus decreases with temperature. Loss modulus also increases with temperaturebefore it reaches glass transition temperature, and it reaches the peak when at the glass transitiontemperature, and then decreases with the rises of temperature. As to bamboo samples from differentlocations, the storage modulus and loss modulus increase from inner to outer in the radial of walls. The storage modulus and loss modulus increase with age. The longitudinal variation was the storagemodulus and loss modulus increase with height. The storage modulus increases with frequency; lossmodulus and loss factor decreases with frequency.(7)Burger model could simulate short-term creep of bamboo. The coefficient of determination wasgreater than0.99. The start of the same height and radial positions of bamboo creep compliance, as thegrowth of the age of bamboo, it has a tendency to gradually reduce; Along the radial bamboo timber,creep resistant ability strengthens gradually from inner to outer; Temperature significantly affect thecreep property, creep gradually increase along with the rise of temperature, low temperature when theelastic strain main proportion, along with the rapid growth of temperature increase viscous strain, theproportion increased gradually.