Study Of COPNA Resin In Complex System

In this study, three kinds of polycyclic aromatic hydrocarbons (naphthalene, anthracene, pyrene) were used as raw materials respectly to composite three single raw material systems. The effects of various factors, such as reaction temperature, cross -linking agent contents, catalyst contents, etc. on the condensed poly nuclear aromatic (COPNA) resin synthesis and its properties were investigated. On this basis, by combining different contents of the naphthalene, anthracene, pyrene, a complex hybrid system was established. The impacts of different aromatic hydrocarbon on its product were estimated through analysis of IR,and weight loss.Additionally, COPNA/polystyrene materials was also prepared by means of using COPNA resin as a matrix and polystyrene (PS) as a modifier. Through analysis of residual carbon, soften point, hardness, resistance to corrosion and solubility, the effects of polystyrene contents and curing processing parameters were discussed.The results show that the best COPNA resin reaction temperature of naphthalene, anthracene, pyrene system were 140℃, 180℃, 160℃, the best cross-linking agent contents (agent/monomer) were 1.0/1.0. The optimum catalyst dosage was at 5%,and under these conditions, the same results occurred in these three systems relatively. Generally, Soften point and residual carbon were increased with the increasments of the temperature, cross-linking agent and catalyst content. In the complex system, it was reveled that the degree of Polycondensation in the period of COPNA-B resin synthesis was domainated by the reactivity of aromatic hydrocarbons. However, the spatial scale of polycyclic aromatic hydrocarbons determines the network structure of the composite in the period of COPNA-C resin synthesis. With a higher reactivity, anthracene can enhance the soften point and carbon residue of the COPNA, but reduce its solubility in organic solvents. Because of its larger molecule scale, pyrene can increase the heat-resistance of COPNA-C resin, but decline its solubility in organic solvents. It was realized that the performance of COPNA resin can be improved through the method by adding PS. When PS content goes up to 10%,the soften point increased 5℃and residual carbon increased 1.32% ,and its solubility in methylbenzene was increased from 55.66% to 78.15% comparing with unmodified COPNA resin. A conclusion can be drawn that there are some chemical reactions in modification process, which make the intermolecular combination stronger. It is also revealed that hardness of the modified resin material was increased and resistance to chemical corrosion was declined in higher curing temperature. The hardness and resistance to the corrosion can both be improved with the increasement of curing time. The reason for this phenomenon is that long time and low temperature curing can make deeper condensation, and cooling the material. The best curing condition of modifying COPNA resin is being curred 20 hours at 120℃and its hardness can be approached 77.6HSD.