ABSTRACT

Polymethyl methacrylate/hydroxylated multi-walled carbon nanotubes (PMMA/MWCNT-OH) nanocomposites were prepared by solution blending by adding 1, 2, 3, and 4 wt-% MWCNT-OH. The thermal degradation mechanism and thermal life of PMMA/MWCNT-OH in nitrogen and oxygen atmospheres were investigated in detail. When MWCNT-OH content was 3 wt-%, the maximum thermogray-weight temperature (T_m) was 11.5°C and 61.4°C higher than that of PMMA in nitrogen and oxygen atmospheres. Three-dimensional diffusion reaction and level 1.5 chemical reaction in nitrogen atmosphere and one-dimensional diffusion reaction and level 1 chemical reaction chemical reaction in oxygen atmosphere by Achar method and Coats–Redfern method were the possible mechanisms of PMMA and PMMA/MWCNT-OH nanocomposites. When the weight loss rate of 30% was taken as the thermal life end point of the composites, the thermal life first increased and then decreased with the content of MWCNT-OH increased by Kissinger method and Dakin equation.

摘要

聚甲基丙烯酸甲酯/羟基化多壁碳纳米管 (PMMA/MWCNT-OH) 纳米复合材料通过添加 1、2、3 和 4 wt-% MWCNT-OH 的溶液混合制备。详细研究了PMMA/MWCNT-OH在氮氧气氛中的热降解机理和热寿命。当 MWCNT-OH 含量为 3 wt-% 时, 最大热灰重温度 ( T _m) 在氮和氧气氛中比 PMMA 高 11.5°C 和 61.4°C。Achar法和Coats-Redfern法在氮气气氛中的三维扩散反应和1.5级化学反应以及在氧气气氛中的一维扩散反应和1级化学反应化学反应是PMMA和PMMA/MWCNT-OH纳米复合材料的可能机理. 当以30%的失重率作为复合材料的热寿命终点时，根据Kissinger法和Dakin方程，随着MWCNT-OH含量的增加，热寿命先增加后减少。