摘要
用三氟化硼乙醚(BF3·OEt2)为催化剂,乙二醇(EG)为起始剂,二氯甲烷作溶剂,用阳离子开环聚合方法制备了新型端羟基环氧环己烷-四氢呋喃(CHO-THF)共聚醚,讨论了催化剂用量、原料配比和EG用量对共聚的影响,合成共聚醚的最佳工艺条件为n(THF):n(CHO)=1:2,BF3·OEt2用量1.5%,EG用量1.0%,温度0℃,聚合时间4h。在该条件下合成的共聚醚Mn:大于3000,转化率达95%。采用IR和1HNMR对共聚醚进行了结构表征。用该共聚醚制备的聚氨酯涂膜性能优良。
Using boron-trifluoride ethylether complex(BF3·OEt2) as catalyst, ethylene glycol (EG) as initiator and CH2Cl2 as solvent, a new type of hydroxyl-terminated copolyether [P(CHO-THE)] was synthesized from epoxy cyclohexane(CHO) and tetrahydrofuran(THF) by cationic ring-opening co-polymerization. The effects of the catalyst amount, the molar ratio of THF/CHO and initiator amount on the copolymerization were studied. The optimal technical conditions were found as follows: n (THF)/n(CHO) =1/2, n(BF3·OEt2 )/n(CHO + THF) =0. 015, n(EG)/n(CHO + THF) =0. 01, polymerization temperature 0 ℃, polymerization time 4 h. Under these conditions, the average molecular weight of P(CHO-THF) could be more than 3 000, the conversion could up to 95%. The copoly-mer was characterized by IR and 1H NMR. Finally, polyurethane coatings with excellent performance were manufactured with this copolyether.
出处
《精细石油化工》
CAS
CSCD
北大核心
2005年第1期44-47,共4页
Speciality Petrochemicals
基金
湖南省杰出中青年专家基金资助项目
