Preparation Of Interfacial Compatibilizer In MAH/VTMS Co-grafting PP And Study On Its Properties

Wood fiber is one of most abundant natural polymer materials in nature, it is one of the oldest natural materials which was developed by human, due to it has lots of advantages, such as low density, low cost, high strength, biodegradable and recycling, etc.. Nowadays, it is currently the national economy indispensable material. However, it also has some deficiencies in performance, such as decadence, swelling shrinkage, deformation, destroyed by insects and combustible. In recent decades, the application of Wood fiber in some areas was affected by the reduction of natural forest resources and Logging. The wood mechanical properties of fast growing juvenile wood decreased in some extent, which has some effect in its application. On the other hand, there are hundred tons of remaining waste wood chips in timber processing, and more than 1,000,000 tons other natural fibers such as rice bran annual in our country. The past, the scrap wood and sawdust, anticipate to can do for the fuel or solid garbage to handle and generate unproductive to also give to result in very big public nuisances at the same time. In recent years, plastic has become the indispensable material in the national economy. Along with a great deal of use of plastics, white pollution caused by waste plastics are more and more attention. How to find a recycling of waste plastics has become one of the most important topics of current domestic and international environmental conservation realm.Using wood fiber and plastics(or discard plastics) compound together to prepare wood plastic composites, which not only can recycle waste products and reduce environmental pollution, but also can solve some of the defects in the performance of a single material. Wood-plastic composites is a novel type composite material, with good quality and performance, it is one of most important development of a newly environmental material in the 21st century, so, wood-plastic composites has been closely concerned by scholars at home and abroad. However, two constitutes of wood-plastic composites which were wood fiber and polymer matrix have poor compatibility, which affects the performance of wood-plastic composites directly. The vital question of the research of wood-plastic composite is improving the dispersion of wood powder and increasing the compatibility of the interface compatibility. The solution of this question is focus research of the wood-plastic composite.In this paper, we prepared three interfacial compatibilizer:maleic anhydride grafting polypropylene (MAH-g-PP),silane grafting polypropylene, (VTMS-g-PP),maleic anhydride/ silane grafting polypropylene(MAH/VTMS-g-PP), using maleic anhyoride (MAH), silane (VTMS) and maleic anhydride/silane (MAH/VTMS) graft, by pre-irradiated polypropylene (PP) method, respectively. Then the wood powder of poplar were chose as filler, which combined with high-density polypropylene (PP-HD) to compose the wood-plastic composites. And we have researched the effects of mechanical properties, interface compatibility and processing rheology, water absorption by different interfacial compatibilizer, type of filler, quantity of wood powder, systematically. The results show that:three kind of interfacial compatibilizer could well improve the interface compatibility properties of wood plastic composites, and performance of MAH/VTMS-g-PP was the best type in three kind of interfacial compatibilizer. This is mostly because MAH/VTMS-g-PP has two type of monomer of graft and two active groups, which produced a synergistic effect in the complex process produces, induced the increasing of the mechanical properties of wood plastic composites significantly. Firstly, with the addition of interfacial compatibilizer, the mechanical properties of composite gradually increased. When the addition of interfacial compatibilizer is up to 10%, the mechanical property reaches maximum. And when the addition of interfacial compatibilizer continues to increase, the mechanical property of wood plastic composites began to decrease.The relationship of content of wood powder and mechanical properties of composites indicated when content of wood powder is up to 60%, mechanical properties and the rheological behaviour of composites are best situation. With the increase of the time of immersion in the water and temperature, the mechanical property of wood plastic composites has decreased. However, the MAH/VTMS-g-PP-based interface agent, which made water absorption of wood-plastic composites much lower than other, the level of mechanical property of composites decreased is least. The dispersivity of wood powder in PP-HD substrate and the interface cohesiveness of wood powder with PP-HD have improved by addition of interfacial compatibilizer, especially addition of the MAH/VTMS-g-PP, which have been proved by Scanning electronic microscope (SEM) and Fourier infrared spectrum (FTIR). The rheological behaviour was investigated at different condition of sort of interfacial compatibilizer, contents of wood powder, temperature, rotational speed by Torque Rheometer. The best conditions proved by the experiments are the content of wood powder in wood powder/PP-HD composites at 60%, content of lubrican at 1%, content of MAH/VTMS-g-PP at 10%, temperature at 190℃.