溴掺杂低密度PMP泡沫的制备技术研究
Synthesis of low-density bromine doped PMP foam
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摘要: 详细论述了掺溴聚-4-甲基-1-戊烯(PMP)低密度泡沫的制备方法与性质测量。以PMP为泡沫骨架材料，均四甲苯/萘为溶剂，六溴苯为掺杂单体，利用热诱导倒相法制备出密度20～60 mg/cm3的掺溴低密度泡沫。在理论密度为50 mg/cm3时掺杂溴原子最大质量分数可达58.91%。利用扫描电镜观测泡沫结构表明：聚合物泡沫均是一种“叶片”状开放的结构，“叶片”的大小依赖于聚合物掺杂量的多少。随着掺杂量的增大，可供形核-长大的晶核也逐渐增多，最终得到的聚合物“叶片”较小。整个体系中密度分布是较为均匀的，掺杂单体在整个聚合物体系中基本不存在沉降的趋势。整个泡沫体系在低温区未出现较大的失重，溶剂的脱出较为完全线。Abstract: Inertial confinement fusion(ICF) experiments need the incorporation of dopant atoms into the low density foam. Through a phase-separation process, the Bromine (Br) doped foams with a typical density of 50 mg/cm3 were synthesized contaning 58.91% Br atom. A lamellar structure was observed in the scanning electron microscope (SEM) image of the PMP foam. The monomer hexabromobenzene acted as the “crystalloid” in the sol-gel process. As the dopant level increased, there were more “crystalloids”, which would make the lamellar become smaller. Taking the measurement error into account, the dopant was dispread uniformly in the foam sample. The thermo gravimetric analysis used in different dopant level indicates the solvent was removed completely from the whole foam system.
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Key words:
- low-density foam /
- dope /
- target materials /
- density distribution
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