Study On Preparation And Propetry Of Flame-retardarding Polydicyclopentadiene

Polydicyclopentadiene (PDCPD) is a novel high performance thermoset plastics with widely application prospect. It is flammable and can produce a large number of smoke accompanied with melting drops phenomenon which resulted in flame propagation. Thus its application in many fields are limited. In order to extend the application field of PDCPD material,we developed a flame retardant PDCPD material having good comprehensive performance using modified aluminum hydroxide (G-ATH) as fill-type flame retardant.In this article, The preparation process of flame retardant PDCPD material using G-ATH as flame retardant was mainly studied. The flame retardancy and physico-mechanical properties of PDCPD material were systematically investigated. The limit oxygen index, level combustion and mechanical properties of PDCPD materials filling ATH and G-ATH flame retardant respectively were tested and compared. The formula of flame retardant PDCPD material was confirmed. It had found the influence law of G-ATH on preparation process and physico-mechanical properties of PDCPD material. Meanwhile the section morphology analysis and various thermal analysis were carried out.This article also studied the preparation process of G-ATH. The measurement for the activation index and oil adsorption value of obtained G-ATH were carried out to evaluate the modification effects. The optimal modification conditions were defined. And the structure analysis and thermal analysis of G-ATH were carried out.The study shows that: (1) The flame-retardant PDCPD material was prepared in this research. It has the limiting oxygen index≥25% and its level of combustion can be achieved HB grade. And compare with no filled flame-retardant PDCPD material, the tensile strength, the flexdral strength and the elongation at break of the flame-retardant PDCPD materials are higher. (2) As a flame retardant, G-ATH was filled PDCPD material, it didn't affect the reaction system of polymerization. When the filled amounted to 40% of G-ATH, the reaction system still have a normal polymerization, and the monomer conversion has not significant effect on G-ATH. (3) The thermal properties of flame-retardant PDCPD material has not been a significant effect on G-ATH, and the heat sag property of flame-retardant PDCPD material was increased by 50% or more.