环氧化SBS制备与表征

Synthesis and Characterization of Epoxidized Styrene-butadiene-styrene Triblock Copolymer

以H2O2为氧化剂．利用原位反应生成的磷钨杂多酸铵盐为催化剂在水／有机溶剂两相体系中使SBS环氧化。研究了反应条件对环氧化反应的影响，并用^1H—NMR、FT—IR、GPC对环氧化SBS（ESBS）的结构进行表征．研究结果表明该环氧化方法具有反应条件温和、反应速度快、新生成的环氧基不发生开环水解反应等优点；但反应中伴随有SBS交联和降解副反应，严重影响ESBS性能．通过添加0．3％～0．6％抗氧剂、选择甲苯／三苯基磷酸酯混合溶剂为有机相可以抑制交联和降解副反应，提高反应选择性．使制得的ESBS具有良好的性能．

SBS epoxidation reaction was preformed in water/solvent biphasic system in the presence of in-situ prepared methyltrioetylammoniumtetrakis（diperoxotungstate） phosphate, using H2O2 as oxidant. The effect of reaction conditions on epoxidized SBS properties was investigated. The epoxidized SBS structures and molecular weight distribution were also charaeterized by ^1H-NMR, FT-IR and GPC. It was demonstrated that epoxidation method used in this paper had many advantages,such as mild reaction condition, fast epoxidation speed, free of epoxy group hydrolysis reaction. But serious crosslinking reaction also occurred during epoxidation reaction,which could result in reduced solubility of epoxidized SBS. In order to improve selectivity of epoxidation reaction,0.3 % -0. 6 % （by mass） antioxidant was used,toluene/triphenyl phosphate mixture was chosen as organic phase solvent. Under these reaction conditions,high epoxy degree and well solubility of epoxidized SBS can be gained.