一种改性HTPB型聚氨酯的力学性能研究

Mechanical Properties of Modified Hydroxyl-Terminated Polybutadiene Based Polyurethane

采用过氧乙酸原位法对端羟基聚丁二烯（HTPB）进行环氧化改性，制备出不同环氧值的环氧化端羟基聚丁二烯（EHTPB）。将EHTPB分别与甲苯二异氰酸酯（TDI）、异佛尔酮二异氰酸酯（IPDI）和4，4-二环已基甲烷二异氰酸酯（H12MDI）三种异氰酸酯类固化剂以及扩链剂1，4-丁二醇（BDO）固化交联形成聚氨酯，然后对聚氨酯的力学性能进行了研究，并利用红外和扫描电镜（SEM）对其结构进行了分析。结果表明：对于产物力学性能，H12MDI是一种更好的固化剂；EHTPB环氧值最佳值控制在0．18mol·（100g）-1为好；加入扩链剂BDO可以提高产物的力学性能，BDO的最佳加入量为BDO的-OH与HTPB的-OH的摩尔比为1—2，EHTPB／H12MDI／BDO体系具备最佳的力学性能。

The epoxidized hydroxyl-terminated polybutadiene （EHTPB） with different epoxide number was prepared by peroxide acetic acid in situ. EHTPB based polyurethane was prepared by curing with diisocyanates （toluene-diisocyanate（TDI）, isophoronediisocyanate（IPDI） and 4,4-dicyclohexylmethane-diisocyanate （ H12 MDI） , and chain extender 1,4-hutanediol （ BDO ） ）. Its structure was also analyzed by infrared spectroscopy and scanning electron microscopy （SEM）. Results show that H12 MDI is a better solidified agent for improving mechanical properties of polyurethane. The optimal epoxide number of EHTPB is about 0.18 mol · （100 g） -1. Mechanical properties of polyurethane can he improved by adding extender BDO. The optimal content of BDO is that the mole ratio of --OH（BDO）/--OH（EHTPB） is 1 - 2. The experimental results indicate that EHTPB/H12 MDI/BDO based polyurethane has the highest mechanical properties.