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首页> 外文期刊>Journal of Applied Polymer Science >PMMA composites of single-walled carbon nanotubes-graft-PMMA
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PMMA composites of single-walled carbon nanotubes-graft-PMMA

机译：单壁碳纳米管-接枝-PMMA的PMMA复合材料

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摘要

To facilitate the dispersion of single-walled carbon nanotubes (SWCNT) into poly(methyl methacrylate) (PMMA), SWCNT were functionalized with a RAFT chain transfer agent, and PMMA was grafted from the SWCNT by reversible addition-fragmentation transfer (RAFT) polymerization to give SWCNT-g-PMMA containing 6 wt % PMMA. SWCNT-g-PMMA in the form of small bundles was dispersed into PMMA matrices. The SWCNT-g-PMMA filler increased the glass transition temperature (T_g) of the composite when the matrix molecular weight M_n was less than the graft molecular weight, but not when the matrix M_n was equal to or greater than the graft M_n. The threshold of electrical conductivity of the composites as a function of weight percent SWCNT increased from 0.2% when matrix M_n was less than graft M_n to about 1% when matrix M_n was greater than graft M_n. Dynamic mechanical analyses of the composites having graft M_ n less than or equal to matrix M_n showed broader rubbery plateaus with increased SWCNT content but no significant differences between samples with different grafted PMMAs. The results indicate that lower M_ n matrix wets the SWCNT-g-PMMA whereas higher M_n matrix does not wet the SWCNT-g-PMMA.
机译：为了促进单壁碳纳米管（SWCNT）分散到聚甲基丙烯酸甲酯（PMMA）中，用RAFT链转移剂对SWCNT进行功能化，并通过可逆加成-断裂转移（RAFT）聚合从SWCNT接枝了PMMA。得到含有6重量％PMMA的SWCNT-g-PMMA。将小束形式的SWCNT-g-PMMA分散到PMMA基质中。当基体分子量M_n小于接枝分子量时，SWCNT-g-PMMA填料会提高复合材料的玻璃化转变温度（T_g），而当基体M_n等于或大于接枝M_n时，则不会。复合材料的电导率阈值随重量百分比SWCNT的变化从基质M_n小于接枝M_n时的0.2％增加到基质M_n大于接枝M_n时的约1％。接枝M_n小于或等于基体M_n的复合材料的动态力学分析显示，橡胶状平稳期较宽，SWCNT含量增加，但接枝不同PMMA的样品之间无显着差异。结果表明，较低的M_n基质会润湿SWCNT-g-PMMA，而较高的M_n基质不会润湿SWCNT-g-PMMA。

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