摘要
研究了N催化剂分别与助催化剂AlEt3和Et2 AlOAlEt2 结合 ,在给电子体二苯基二甲氧基硅烷 (DDS)存在下 ,催化乙烯和苯乙烯共聚合反应 ,考察了Al Ti摩尔比对共聚反应的影响 .共聚产物经过丁酮 (MEK)和四氢呋喃 (THF)连续抽提 ,表明共聚产物包括无规聚苯乙烯 ,乙烯 苯乙烯共聚物和乙烯均聚物 .乙烯 苯乙烯共聚物分别用1 3C NMR、DSC和GPC进行表征 ,结果表明 ,助催化剂不仅对N催化剂的聚合活性有影响 ,而且对共聚产物中各级份的重量比例也有显著影响 ;特别是对乙烯 苯乙烯共聚物中苯乙烯的含量、熔点 (Tm)和玻璃化转变温度 (Tg)有明显的影响 .
The copolymerization of ethylene and styrene was carried out using N catalyst activated with AlEt3 and Et2AlOAlEt2 at the present of DDS. The optimum copolymerization conditions of Al/Ti was investigated. The copolymerization products were fractionated by successive solvents extraction with boiling butanone and THF. The experimental results indicate the copolymerization products include polystyrene, ethylene-styrene copolymer, and polyethylene. The ethylene-styrene copolymers were characterized by C-13-NMR, DSC and GPC. It is found that cocatalyst not only affects copolymerization activity of N-catalyst,but also influences the ratio of different fractions in coplymerization products, especially the styrene incorporation, the melting point and the glass transition temperature of ethylene-styrene copolymer.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2005年第1期4-7,共4页
Acta Polymerica Sinica
