Study On The Preparation And Properties Of Bamboo Fibre-Based Composites

Bamboo, one of the strongest natural structural composite materials, has many distinguishing features. Due to the high water-repellent properties, the high flexibility, the high strength, the low weight, the fast-growing and the low purchasing costs, bamboo became more and more popular as a building material with many opportunities. In this paper, bamboo fibres were made from waste bamboo scrap. In this way, the environment was protected and the waste was avoided. The waterproof, mechanical Properties, aging properties of the MUF bamboo-based composite materials permeability, as well as the physical and chemical properties of PCL/BF composite are the main content of this study. The main contents and conclusions are as follows:(1) After the MUF/BP composite materials test, we get the optimal formula:M:U= 1.5:1, M:F= 1.5:4.4, the best modifier for the MUF resin is the nano-silica. The best modifier for bamboo powder is aluminum acetate, dosage is about 1.5%(w/w). The best ratio of Bamboo powder and MUF:Bamboo powder 55 meshs, glue consumption 14%. The best hot-pressing process as follows:pressure 10MPa, hot-pressing temperature 145℃, hot-pressing time 10 minutes.(2) UV accelerated aging methods, through the mass loss rate, mechanical properties and changes of carbonyl index, effects of different modifiers on the MUF bamboo-based composite material properties of photo-aging was discussed. The results show that, nano-TiO2 on the aging of the material played a certain role in promoting, but to add the appropriate amount of the aging properties of the material little effect; nano-SiO2 in the composite played a more visible role in anti-aging.(3) We fund that the mechanical properties of composite materials was improved by adding aminosilane coupling agent. The optimum process conditions were obtained by using the three-factor quadratic regression orthogonal rotary as follow:hot-pressing temperature 95℃, molding time 9min, pressure 21MPa.(4) The non-isothermal crystallization kinetics of modified bamboo fiber/polycaprolactone (MBF/PCL) composites was investigated by differential scanning calorimetry (DSC) at different cooling rates. The results were studied by a direct fitting of the experimental data to various macro kinetic models, namely, Avrami, Ozawa and Mo models. Both the Avrami analysis modified by Jeziorny and the method developed by Mo could describe the non-isothermal crystallization of the composites very well, but the Ozawa analysis could not give an adequate description. Kinetic parameters such as the Avrami exponent (n), the kinetic crystallization rate constant (Zc), the peak temperatures (Tpeak) and the half-time of crystallization (t1/2) etc were determined at various scanning rates.