钯碳催化苯乙烯与CO共聚反应研究

Studies on the Copolymerization of Styrene and CO Catalyzed by Pd/C

为研究以合成聚酮高分子寻找高效廉价的催化体系,制备了5%的活性碳负载钯多相催化剂,并首次将其用于催化苯乙烯与CO共聚合成聚酮(PK)的反应中.采用红外光谱、元素分析、13CNM R和热重分析等手段对苯乙烯/CO共聚产物的结构和性质进行了表征.分别讨论了在钯碳催化剂作用下,含氮配体以及助催化剂强酸等因素对共聚反应的影响,并评价了钯碳催化剂在苯乙烯与CO共聚反应中的循环使用效果.实验结果表明,在温度为65℃,CO压力为3.0M Pa的条件下,当使用2,2′-联吡啶为配体,三氟甲基磺酸为助催化剂时,钯碳催化苯乙烯与CO共聚反应的活性可达4.65×103g PK/(m o lPd.h),共聚产物的重均分子量(Mw)可达9.32×103g/m o l,数均分子量(M n)可达5.23×103g/m o l.

In order to search for the efficient and cheap catalyst for the synthesis of polyketone, heterogeneous catalyst of Pd/C was prepared used in the copolymerization of styrene with carbon monoxide as catalyst for the first time. Techniques such as FT-IR, EA,^13CNMR and TGA were used to characterize the copolymer of styrene and CO. Effects of different ligands and different acids on the catalytic activities of Pd/C were discussed and the recycling of Pd/C catalyst was investigated. The results showed that under the conditions of 65℃ and CO 3. 0 MPa, the catalytic activity of Pd/C on the copolymerization of styrene with CO was 4.65 × 10^3gPK/（molPd · h） with bipy as ligand and TfOH as cocatalyst, and the Mw of the copolymer was 9. 32× 10^3g/mol and the Mn of the copolymer was 5.23 × 10^3 g/mol.