不饱和三元聚醚橡胶的合成及其某些性能

SYNTHESIS OF ECH-EO-AGE TERPOLYMER AND THEIR PHYSICAL PROPERTIES

以Al(i-Bu)_8-H_8PO_4-H_2O-DMA(二甲基苯胺)四元催化剂合成了环氧氯丙烷(ECH)/环氧乙烷(EO)/烯丙基缩水甘油醚(AGE)三元不饱和氯醇醚橡胶。当四元催化剂的摩尔比为1∶0.15∶0.15∶0.10,在10～30℃,24hr,所得产物的ηi在3.0～4.5之间,共聚转化率在95％以上。试验表明:ECH、EO、AGE的三元共聚反应速度略低于ECH与AGE的二元共聚。X-射线衍射显示ECH/EO/AGE三元胶为无定形结构。硫化胶的力学性能(抗张力强度280kg/cm^2,伸长率360％,永久形变16％)和辊筒行为均优于ECH/AGE二元胶。

Unsaturated terpplymer of epichlorohydrin-ethylene oxideallyl glycidyl ether (ECH-EO-AGE) was prepared by using Al(i-Bu)3-H3PO4-H2O-DMA catalystic system. The inherent viscosity of the terpolymer can be raised from 3.0 to 4.5 as the catalyst molar ratio was in 1:0.15:0.15:0.10 at room temperature. The results showed that the terpolymerization rate seemed to be slower than that of the copolymerization of ECH with AGE. The ηi of terpolyether decreased more than that of copolyether of ECH with AGE as the catalyst composition and molar ratio was changed. The experiment also indicated that the nnnnnnnni of terpolyether was reduced rapidly with increased of polymerization temperature and the amount of impurities containing active hydrogen.ECH-EO-AGE terpolymer appeared to be an amorphous structure by X-ray diffraction, and the water absorbency increased with the content of EO unit. The processing behavior and physical properties of its vulcaaizates (tensile strength 280 kg/cm2, elongation 360%) were superior to those of ECH-AGE copolyether and its vulcanizates (tensile strength 223 kg/cm2, elongation 281%) .