苯乙烯-异戊二烯-苯乙烯嵌段共聚物选择性催化加氢

Selective catalytic hydrogenation of styrene-isoprene-styrene block copolymer

摘要:

苯乙烯-异戊二烯-苯乙烯嵌段共聚物（SIS）通过催化加氢可提高物理化学性能，使其更广泛地应用于工业中。以氯铂酸、尿素为原料，通过简单的化学还原法制备了Pt/g-C3N4催化剂并应用于SIS非均相催化加氢反应。采用XRD、TEM、1HNMR、DSC等对催化剂及产物进行了结构表征，考察了催化剂组成、Pt金属负载量、反应条件等因素对SIS加氢性能的影响。结果表明，以环己烷作溶剂，在140 ℃、3 MPa条件下反应2 h，SIS加氢度为85%，对异戊二烯段碳碳双键选择性高达95%。

Abstract:

Styrene-isoprene-styrene block copolymer (SIS) can improve its physical and chemical properties and mechanical properties through catalytic hydrogenation, making it more widely used in industry. Here a simple chemical reduction method was employed for preparing Pt/g-C3N4 catalyst using chloroplatinic acid and urea as raw materials, and the influence of catalyst composition ,the amount of Pt and reaction conditions on the hydrogenation performance of SIS was investigated. The structure of catalysts and products was characterized by XRD, TEM, 1HNMR, DSC, etc. The results shows that Pt/g-C3N4 exhibits a superior activity with 85% hydrogenation degree of SIS and 95% selectivity to C==C bonds of isoprene units under the conditions of 140 ℃, 3 MPa, 2 h, with cyclohexane as solvent.