在硝胺填料HMX表面的乳液聚合-包覆

Emulsion Polymerization and Coating on Nitramine HMX Filler Surfaces

研究硝胺晶体填料 HMX的包覆 .根据 XPS测定的包覆度数据 ,选择三羟甲基丙烷作为制备端羟基聚氨酯 (PU)预聚物的三元醇 ,使设计的交联包覆层具有抗溶解和抗剪切能力 ,并采用端羟基 PU预聚物与异佛尔酮二异氰酸酯的乳液聚合反应 ,对硝胺晶体填料 HMX进行包覆 .经过对比 ,得出合适的乳液聚合 -包覆工艺条件 .将包覆的 HMX用于制备含能复合材料 ,材料的拉伸强度提高了 2 1.3% .在硝胺

To study the coating on nitramine HMX filler surfaces, based on the data of coating degree from XPS measurements, tris (hydroxy methyl) propane was chosen as triol monomer when preparing OH terminated PU prepolymers, which enables the designed crosslinked coating polymer to improve the abrasion resistance and solvent resistance of the coatings. The emulsion polymerization of OH terminated PU prepolymer and isophorone diisocyanate was used to form the polymeric shell on nitramine HMX particle surfaces. A suitable processing technique for applying the coatings was developed in an emulsion system. The sufficiently coated HMX fillers were incorporated into an energetic composite. A 21 3% increase of tensile strength was obtained when compared to a similar formulation incorporating uncoated HMX. It is shown that the formation of crosslinked polymeric coating on HMX filler surfaces plays a role for interfacial reinforcement between HMX fillers and polymeric binders.