摘要
对在四氯化碳存在下 ,大孔St DVB共聚物以三氯化铝为催化剂的后交联反应进行了研究 .结果表明 ,起始共聚物的合成条件 ,包括交联剂DVB的用量 ,致孔剂的性质及其与单体的配比 ,对后交联产物的孔结构有重要影响 .以良溶剂甲苯为致孔剂及采用较高的DVB用量 ,所合成的起始共聚物经后交联后 ,比表面积很容易达到或超过 10 0 0m2 /g .一般情况下 ,后交联产物的孔容增加 ,孔径减小 ,孔结构稳定性明显提高 .当起始共聚物的DVB含量较低时 ,后交联反应以四氯化碳的参与为主 ;当DVB含量较高时 。
With anhydrous aluminum trichloride as Friedel-Crafts catalyst, the postcrosslinking reaction of macroporous St-DVB copolymers in the presence of carbon tetrachloride was investigated. The results show that the synthesis conditions for the starting copolymers, including the DVB content, the type and amount of the porogens, play an important role in forming the pore structure of the postcrosslinked products. When the starting copolymers with relatively high DVB content were synthesized using good solvent( toluene) as porogen, the specific surface area for the postcrosslinked products could reach the value of 1000 m(2)/g or higher. The postcrosslinking reaction, generally, increases the pore volume I decreases the average pore diameter, and greatly increases the stability of pore structure of the resulted products. The role of the carbon tetrachloride as a crosslinker, at relatively low DVB contents of the starting copolymers, could be confirmed by the C=O group peaks in IR spectra of the postcrosslinked products. On the other hand, an alkylation reaction of the pendant vinyl groups with neighboring aromatic rings is believed to dominate the course of the postcrosslinking at high level of DVB content, as manifested by the good correlation of the consumption of pendant vinyl group with the increment of specific surface area of the copolymers after postcrosslinking reaction.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2002年第4期452-456,共5页
Acta Polymerica Sinica
