摘要
采用双金属氰化络合物 (DMC)催化环氧丙烷 (PO)和邻苯二甲酸酐 (PA)共聚 ,探讨了共聚合特征 ,并用IR、1 H NMR和GPC对共聚物的结构和分子量进行了表征 .发现DMC催化剂对该共聚反应速度快 ,转化率高 ,是该反应的有效催化剂 ,催化剂浓度为 6 0mg kg时 ,90℃下 ,以THF作溶剂共聚反应 3h ,转化率可达94 0 % .聚合速度甚至比DMC催化PO均聚还快 .该共聚反应可在多种溶剂中进行 ,极性溶剂更有利于共聚合 ,溶液聚合温度比本体共聚低 ,合适的溶液共聚温度在 90～ 10 0℃之间 .共聚产物的分子量受催化剂用量、反应温度和体系中水份含量的影响 ,数均分子量在数百至数千之间 .考察该共聚体系的动力学表明 。
Ring-opening copolymerization of phthalic anhydride (PA) with propylene oxide (PO) was successfully carried out by using double-metal cyanide (DMC). The characteristics of the copolymerization were presented and discussed. The structure of the copolymer was characterized with IR and H-1-NMR. The number-average molecular weight (M) and molecular weight distribution of the copolymer were measured by GPC. The results showed that DMC was a highly active catalyst for the copolymerization of PA and PO,giving high yield with a rate much higher than that of PO homopolymerization with the same catalyst at a low catalyst level of 60 mg/kg. This copolymerization can be also carried out in many organic solvents, and it was easier to be carried out in polar solvents such as THF and acetone than in non-polar solvents such as ether and cyclohexane. The proper temperature for reactions carried out in solutions was in the range of 90 similar to 100degreesC. That was lower than the temperature range for bulk-copolymerization. The M-n was affected by the catalyst level, reaction temperature and trace water. M-n was in a range of 2500 similar to 4000 under firm polymerization conditions by removing trace water and other impurities. The kinetics of the copolymerization was also studied. The results indicated a first order relationship between the copolymerization rate and the monomer concentration.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2004年第4期551-555,共5页
Acta Polymerica Sinica
基金
国家自然科学基金资助项目 (基金号 5 0 2 73 0 3 1)
