Preparation?Structure And Application Of Chlorinated Trans 1,4-Butadiene-Isoprene Rubber

In this paper,trans-1,4-butadiene-isoprene copolymerized rubber?TBIR?wassynthesized by TiCl₄/mgcl₂-al?i-Bu?₃ catalyst system.Different chlorine content and structure of the chlorinated trans-1,4-butadiene-isoprene rubber?CTBIR?were prepared by solution method.The structure of CTBIR and the control of its important structure were analyzed in detail,and the application scope of new materials was explored.In this paper,chlorine atom was introduced into TBIR for modification.Because TBIR is a copolymer of two diene monomers,the product structure is very complex after chlorination,and changes greatly with different reaction conditions,it is the first task to analyze and speculate the structure of ctbir in detail.The basic structure of CTBIR was analyzed by FTIR,¹H-NMR,Raman,vinyl analysis and GPC.The basic structure of CTBIR,including double bond and allyl chloride,was also controlled.Finally,according to the reaction structure and characteristics of different stages,the chlorination process of TBIR was inferred.The main results show that the chlorination process of TBIR is primarily determined to be a free radical reaction.The chlorination of TBIR can be carried out by chlorine substitution and double bond addition reactions,resulting in allylic chloride structure,1,2-chloro structure,methylene chloride structure,and a small amount of partial chlorine structure and ring structure.The double bond and allylic can be controlled by conventional means,such as the chlorine content of the product or reaction time.The introduction of UV light and polymerization inhibitor is an effective way to obtain high chloride content and high double bond content.Similarly,the introduction of UV light is conducive to the production of allyl chloride,especially the products with high chloride content.In addition,the effect of low temperature reaction on increasing the content of allyl chloride is obvious,and the various measures for controlling the concentration of chloride used in the system have a great auxiliary effect on controlling the effective structure of the molecular chain.Secondly,the contribution of CTBIR to IIR vulcanization process was explored by changing the content of chlorine and the amount of chlorine added to IIR.The influence of CTBIR on the curing rate of IIR system was analyzed by means of comparison of curing properties,basic mechanical properties,scanning electron microscopy?SEM?and differential scanning calorimetry?DSC?.The results show that polar Cl group could be successfully introduced into non-polar IIR to broaden the application scope of non-polar materials.The change of curing speed promoted by polar CTBIR was the reason of double bond superposition and allyl chloride synergy.The compatibility between polar CTBIR rubber and non-polar rubber also became the main factor restricting the system to achieve co curing.Finally,the application of CTBIR in the adhesion of polarity materials?PVC?as adhesives,the preparation of interpenetrating network polymer between ctbir and NR,the improvement of CTBIR'S compatibility with NR/NBR system were explored.The results show that CTBIR has a certain adhesive property.CTBIR can form a good interpenetrating network structure between CTBIR and NR,which can significantly improve the tensile properties and elongation at break of the material.However,the addition of CTBIR can not improve the compatibility between NR and NBR.