用户论文(2006)：<b>《无机化学学报》</b>均相沉淀法制备AACHH阻燃晶须及其生长机理研究

【中文摘要】 采用均相沉淀法制备了一种新型铝系阻燃晶须AACHH,通过FTIR、TG/DTA、化学分析、XRD、SEM、AFM等手段对AACHH的结构、成分、形貌、结晶过程进行了分析与表征。结果表明:AACHH中阻燃气体释放量为63.8%,其结构分子式为NH4Al(OH)3.24(CO3)0.3·8H2O,六方晶系,晶胞参数为a0=1.3335nm、c0=1.1941nm,呈晶须状,长径比为10￣20。其生长机理:首先通过均相成核形成非晶质球形核,当尿素水解达到AACHH过饱和,在球状核界面形成生长单元,在气-固-液(VSL)界面扩散机制下,通过邻位面台阶弯曲,在扭折处进行一维线性生长。 【英文摘要】 The advanced AACHH aluminum system retardant whisker was prepared by homogeneous -precipitation. TG/DTA, XRD, AFM and SEM were characterized to study its structure, component, crystal morphology and progress. The results show that the release weight of retardant gas is 63.8% in AACHH. Its structure molecular formula is NH4Al(OH)3.24(CO3)0.38·H2O. Its crystal structure is hexagonal system. Its unit-cell parameters are a0=1.333 5 nm, c0=1.194 1 nm. Its crystal morphology is whisker shape. Length /width ratio ...