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通过原子转移自由基聚合(ATRP)方法,制备了一组不同PS嵌段长度的聚丙烯酸叔丁酯-b-聚苯乙烯(PtBA113-b-PSn)两亲性嵌段聚合物,研究发现,PS嵌段聚合度较小的PtBA133-b-PS20嵌段聚合物可以在乙醇中有效地分散多壁碳纳米管(MWNT).以此嵌段聚合物作为分散剂首先在乙醇中分散MWNT,得到不同MWNT含量的均相溶液,然后与特定分子量的PtBA均聚物进行溶液共混,制备了一组不同MWNT含量的PtBA/MWNT纳米复合材料.透射电镜(TEM)观察表明嵌段聚合物分散的MWNT在乙醇溶液中几乎呈单根分散状态.利用偏光显微镜(PLM)对不同MWNT含量的复合材料中MWNT的分散状态进行观察表明,MWNT在PtBA基体中分散均匀,相容性良好,没有明显的团聚现象发生.用动态热机械分析(DMTA)对所得材料的力学性能和热性能进行了表征,结果表明,随着复合材料中MWNT含量的增加,材料的弹性模量逐渐增大,同时玻璃化转变温度也有显著提高.
A series of amphiphilic poly (tetrabutyl acrylate) -b-polystyrene (PtBA113-b-PSn) amphiphilic block polymers with different PS block lengths were prepared by atom transfer radical polymerization (ATRP) Multi-walled carbon nanotubes (MWNTs) can be efficiently dispersed in ethanol with PtBA133-b-PS20 block polymer with a small degree of polymerization in the PS block. MWNTs were first dispersed in ethanol using the block polymer as a dispersant to give A series of PtBA / MWNT nanocomposites with different content of MWNTs were prepared by solution blending with PtBA homopolymer with specific molecular weight. The transmission electron microscopy (TEM) results showed that the dispersion of the block polymer MWNT almost completely dispersed in ethanol solution.The observation of MWNT dispersion in different MWNT composites by polarized light microscopy (PLM) showed that MWNT dispersed uniformly in PtBA matrix with good compatibility And the agglomeration phenomenon occurred.The mechanical and thermal properties of the obtained material were characterized by dynamic thermo-mechanical analysis (DMTA). The results showed that the elastic modulus of the material increased with the increase of the MWNT content in the composites, Change the temperature There have also been significant improvements.