摘要
采用甲酸和过氧化氢(H2O2)原位生成的过氧甲酸对苯乙烯-丁二烯-苯乙烯(SBS)进行环氧化改性,制备了环氧化SBS(ESBS)。研究了原料摩尔配比及工艺条件对其环氧基质量分数的影响,利用GPC、FT-IR1、H-NMR等手段对ESBS的结构进行了表征。结果表明,丁二烯链段上双键的反应活性大小次序为:顺-1,4-结构>反-1,4-结构>1,2-结构。在SBS的环氧化反应过程中,会伴有少量环氧基发生开环副反应。当SBS中C C双键、甲酸和H2O2的物质的量配比为1/0.5/0.6,反应时间为2 h,反应温度为60℃时,ESBS的环氧基质量分数最高,达到了18.1%。在体系中加入少量的聚乙二醇,有利于ESBS环氧基质量分数的提高。
The epoxidized styrene-butadiene-styrene block copolymer （ESBS） was in situ generated performic acid method. The effects of the amounts of hydrogen perc acid, and reaction conditions on the mass fraction of epoxide groups were studied. The prepared by an xide and formic structure of ESBS was characterized by GPC, FT-IR and ^1H-NMR. It was found that the order of reactivity for C - C of butadiene units was. cis-1,4-unit〉trans-1,4-unit〉 1,2-unit. In the process of epoxidation reaction, some epoxide groups were opened. When n（C=C）/n（HCOOH）/n（H2O2 ） = 1/0. 5/0.6, reaction time was 2 h and reaction temperature was 60℃, the mass fraction of epoxide groups attained 18.1%. The addition of PEG-400 could increase the mass fraction of epoxide groups of ESBS to a certain degree.
出处
《弹性体》
CAS
2007年第3期37-41,共5页
China Elastomerics
关键词
苯乙烯-丁二烯-苯乙烯
甲酸
过氧化氢
环氧化
结构
styrene-butadiene-styrene（SBS）
formic acid
hydrogen peroxide
epoxidation
structure
