SBS常压加氢反应的红外光谱表征

Characterization of hydrogenation of SBS under normal pressure by IR spectrum

Ｓ Ｂ Ｓ 在常压（０ ．１ Ｍ Ｐａ） 下用镍系催化剂 Ｎｉ（ｎａｐｈ）２ － Ａｌ（ｉ－ Ｂｕ）３ 的加氢反应发生在聚丁二烯链段上，苯乙烯链节不参与加氢反应。以芳环 Ｃ Ｃ 在１ ４９２ ｃｍ － １ 处的特征吸收峰为内标，导出了采用９１０ ，９６６ ，１ ４１７ ｃ ｍ － １ 进行聚丁二烯嵌段中１ ，２ － 链节、顺－ １ ，４ 链节和反－ １ ，４ 链节加氢度的定量计算式，并得出了３ 种链节加氢反应活性由大到小依次为：１ ，２ － 链节，顺－ １ ，４ 链节，反－ １ ，４ 链节。

The hydrogenation of styrene-butadiene-styrene block copolymer (SBS)using nickel naphthenate-triisobutylaluminium as catalyst under 0.1 MPa hydrogen pressure at 30～70 ℃was studied. The degree of hydrogenation was calculated by IR spectrum.The results indicated that the chain units of styrene remains unchanged during the hydrogenation, and one of the characteristic absorption band of carbon-carbon double bond of aromatic ring, 1 492 cm-1,was selected as the internal standard peak in order to measure the degree of hydrogenation of double bond of vinyl unit from 910 cm-1 and trans-1,4 unit from 966 cm-1, and the order of hydrogenation was as follows: 1,2-chain unit,cis-1,4 unit,trans-1,4 unit.