Preparation Of PBS-based Biodegradable Wood-polymer Composites And Its Flame Retardancy And Foaming Behavior

With the development of the society, people demanding forenvironmental protection are becoming higher and higher. So the study ofbiodegradable polymer materials and its application is attracted more andmore attention of researchers. But the biodegradable polymer materialsare very expensive and the fire can be easily set up with heat and flame.All of these factors limit its application. So, this paper used the poplarwood fiber reinforced the PBS to prepare the PBS/PWF composites, andthe following research was carried out. Using rheological properties ofcomposites as a reference to optimize the processing technology. Throughthe surface modification of wood fiber, improved interfacial compatibilityof fiber and matrix, and the comprehensive performance was improved.Also had to research about flame retardants and foaming behavior.The results show that:(1) With the increase of the amount of fiber,the melt flow properties of the composite had a significant decline.Different processing technologies had a certain impact on theperformance of PBS/PWF composites.(2) Chemical bonds were formedbetween fiber and the five modifiers, and the organic modified fiber had abetter dispersion and processability than unmodified fiber in the PBS. Incontrast, fiber treated with MAH-g-PBS had the best dispersion andinteraction force with PBS. Compared to the composites prepared byunmodified fibers, the tensile strength and elongation at break of thecomposites prepared by organic modified fiber increased by69.7%and36.2%, and the flexural strength and impact strength increased by32.3%and28.2%respectively.(3) Distribution of flame retardant’s effect isbetter than a single flame retardants. When the mass ratio of APP/RP/EGwas1:1:4and the total flame retardant content was20wt%，the LOI canbe achieved36.0%, and goal of vertical flammability (UL-94) V-0rate,but the mechanical properties of composites were serious deterioration.Homemade LDHs can improve mechanical properties of composites, butthe flame retardant performance will decline. When the mass ratio ofLDHs was10wt%and the total flame retardant content was20wt%，theLOI can be achieved29.6%, and goal of vertical flammability (UL-94) V-0rate, and the composite also have a excellent mechanical properties.(4) The viscosity could be increased obviously when DCP as a curingagent were added into PBS matrix， and PBS had higher meltstrength．When the content of DCP was3wt%，and the content ofNaHCO3was15wt%, the foam material had uniform cell and moderatedensity．(5) The weight losses of PBS/PWF composites were higher thanthat of pure PBS film and poplar wood fibre, and decreased withincreasing fibre content. Weight losses of modified composites werelower than before.