Synthesis Of Porous Organic Polymers And Their Thermal Insulation And Flame Retardant Properties

Porous organic polymers?POPs?are a novel nanoporous material,which have advantages of large specific surface area,strong adsorption performance,low relative density,and environmental friendliness.It has a huge potential application prospects in the fields of ion exchange,catalysis,gas separation and gas storage,and has aroused extensive attention in the academic community.The high porosity and unique pore structure of POPs make them have good thermal insulation properties.Therefore,POPs can be used as a thermal insulation material.However,many POPs are flammable,which extremely limited their practical application.How to make POPs have good thermal insulation property and high flame retardancy is an important topic for researchers.In this dissertation,we consider the application of POPs in both thermal insulation and flame retardant,we attempted to regulate the thermal insulation and flame-retardant properties of POPs from two aspects,which were the chemical composition and structure of the polymer monomers.Several new types of POPs materials were rationally designed and prepared,and their thermal insulation and flame retardancy were systematically studied in order to provide new research ideas and basis research data for the application of POPs in the fields of thermal insulation property and high flame retardancy.The main contents are enclosed as follows.?1?1,4-dibromotetrafluorobenzene and 1,3,5-triethynylbenzene and 1,4-diacetylenic benzene as monomers,with the ratio of acetylene and bromine of 1:1,by Pd?0?/Cu I as a catalyst,two fluorine-containing conjugated microporous polymers?FCMP-1 and FCMP-2?were prepared by Sonogashira–Hagihara coupling reaction.It was found that FCMP-1 could be formed a monolithic nanofoam under the same preparation conditions.The structure,morphology,thermal stability and pore properties of FCMPs were characterized.The thermal insulation properties of FCMP-1 and FCMP-2 under normal temperature and pressure were discussed.The combustion behavior and flame retardant mechanism of FCMPs were analyzed.?2?5-chloro-1-?4-chlorophenyl?benzotriazole,1,3,5-triethynylbenzeneand1,4-diacetylenic benzene as monomers,according to the ratio of alkyne to bromine is 1:1,two benzotriazole-based conjugated microporous polymers?ZCMPs?were prepared by a Sonogashira–Hagihara coupling reaction using Pd?0?/Cu I as a catalyst.The structure,morphology,thermal stability and pore size distribution of ZCMPs were determined by series of characterization methods.The thermal insulation of ZCMPs under normal temperature and pressure were studied,and the combustion behavior and flame retardant mechanism of ZCMPs were analyzed.At the same time,ZCMPs/EP composites were prepared by adding ZCMPs as flame retardant into epoxy resin?EP?.The combustion behavior and flame retardant mechanism of EP and ZCMPs/EP were analyzed.?3?Porous polymer based on tetrafluoroborate ionic liquids?PDVB-BF₄ILs?were prepared by hydrothermal synthesis under the participation of initiators with1-vinyl-3-ethylimidazolium tetrafluoroborate as monomer and divinylbenzene as cross-linking agent.PDVB-BF₄IL?1:2?,PDVB-BF₄IL?1:4?and PDVB-BF₄IL?1:8?were prepared with a ratio of crosslinker and monomer of 1:2,1:4,and 1:8,respectively.The structure,morphology,thermal stability and pore size distribution of PDVB-BF₄ILs were determined by series of characterization methods.The thermal insulation of PDVB-BF₄ILs under normal temperature and pressure were studied,the combustion behavior and flame retardant mechanism of PDVB-BF₄ILs were analyzed.?4?Porous polymer based on hexafluorophosphate ionic liquids?PDVB-PF₆ILs?were prepared by hydrothermal synthesis under the participation of initiators with1-vinyl-3-ethylimidazolium hexafluorophosphate as monomer and divinylbenzene as cross-linking agent.PDVB-PF₆IL?1:2?,PDVB-PF₆IL?1:4?and PDVB-PF₆IL?1:8?were prepared with a ratio of crosslinker and monomer of 1:2,1:4,and 1:8,respectively.The structure,morphology,thermal stability and pore size distributi on of PDVB-PF₆ILs were determined by series of characterization methods.The thermal insulation of PDVB-PF₆ILs under normal temperature and pressure were studied,the combustion behavior and flame retardant mechanism of PDVB-PF₆ILs were analyzed.?5?Octavinyl POSS was prepared by hydrolytic condensation,and the structure of octavinyl POSS was determined by various characterization methods.Porous polymer based on octavinyl POSS?PDVB-POSSs?were prepared by hydrothermal synthesis using octavinyl POSS as monomer and divinylbenzene as cross-linking agent.PDVB-POSS?1:4?and PDVB-POSS?1:2?were prepared with a ratio of monomer and crosslinker of at ratios of 1:4 and 1:2,respectively.The structure,morphology,thermal stability and pore size distribution of PDVB-POSSs were determined by series of characterization methods.The thermal insulation properties of PDVB-POSSs under normal temperature and pressure were studied,the combustion behavior and flame retardant mechanism of PDVB-POSSs were analyzed.