Fabrication and characterization of Ge-doped polymer and foam
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摘要: 采用稳定自由基聚合法合成了锗掺杂聚苯乙烯类聚合物，并利用聚合物溶液的热致相分离原理和冷冻干燥技术制备出具有多孔结构的锗掺杂泡沫材料。通过核磁共振氢谱、等离子体发射光谱及扫描电镜等测试手段表征了聚合物分子和泡沫结构。结果表明，聚合物分子具有极窄的分子量分布，锗掺杂原子分数为2.6%；泡沫具有多孔网络结构和薄片状骨架，骨架间的孔洞尺寸为1~10 m，泡沫骨架随密度的降低趋于细化，孔洞变大。Abstract: Ge-doped polystyrenes with various molecular weights and low polydispersities were successfully synthesized by stable free radical polymerization of Ge-doped styrene at 120 ℃ in bulk using 2, 2, 6, 6-tetramethyl-1-piperidinyl-oxyl (TEMPO) and AIBN as mediator and initiator respectively. Ge-doped polystyrene foams were obtained by thermally-induced phase separation technique and freezing-dry technology. 1H nuclear magnetic resonance(1H-NMR), Fourier transform infrared spectra (FTIR) and scanning electron microscope(SEM) were applied to characterize the structure of polymers and foams. The results showed that Germanium content in polymer was 2.6 atom% and foams presented porous interconnected structures with macropores of about 1-10 m.
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Key words:
- Ge-doped /
- polystyrene /
- stable free radical polymerization /
- foam
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