摘要
用Fe2^+-H_2O_2引发体系,采用两步法进行苯乙烯与聚乙烯醇无纺布的接枝共聚反应。发现高浓度引发体系引发的接枝共聚反应的起始聚合速率要比低浓度引发体系引发的接枝共聚反应低,但到7h后,前者超过后者。第三组分肼的加入在一定浓度时(0.01%、可以把接枝率提高50%。接棱共聚物PVA-g-PSt和PVA-g-PSt-DVB可用氯磺酸的二氯乙烷稀溶液(2—5%)在30—50℃下进行磺化,制得强酸型阳离子交换纤维。低浓度磷化剂(2%)在30℃短时问(7min)内对低接枝率的产物磺化时,产物交换容量随接枝率上升出现一个峰值,最高交换容量可达7.03meq/g。强酸型阳离子交换纤维对过渡金属离子Cu^(2+),Co^(2+)+Ni(2+)和稀土金属离子La^(3+)有相当高的交换量,列L3^(3+)的交换容量最高可达5.37mcq/g。将H型交换纤维转变为Na型和NH_4型纤维,均能提高与L1_(3+)的交换量,NH_4型纤维与La_(3+)的交换容量高达6.00meqq/g。
The graft copolymerization of styrene and polyvinyl alcobol non-woven fabrics was carried out with redox initiator system Fe^(+2)-H_2O_2.It was found that the primary rate of the graft copolymerization with high concentration of initiator system was lower than that with low concentration, but after seven hours, the former was higher than the later. The sulfonation of graft copolymers PVA-g-PSt and PVA-g-PSt—DVB was performed in dilute dichloride ethene solution(2-5%)under 30-50℃ and the cationic exchange fabrics were obtained. The highest ion-exchange capacity of the fabrics obtained could reach 7.03meq/g, and the strong acid type of cationic exchange fibre is a good absorption material for tran- sition metal ion Cu^(2+), Co(2+)and Ni^(2+),particularlly for the rare earth metal ion La^(8+) the the highest capacity could reach 5.37meq/g.
出处
《合成纤维工业》
CAS
CSCD
1989年第1期6-11,共6页
China Synthetic Fiber Industry
