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In situ synthesis of MWCNT-graft-polyimides: thermal stability, mechanical property and thermal conductivity
RSC Advances ( IF 3.9 ) Pub Date : 2020-4-2 , DOI: 10.1039/d0ra00449a
Chunbo Wang 1 , Bing Cong 1 , Junyu Zhao 1 , Xiaogang Zhao 1 , Daming Wang 1 , Hongwei Zhou 1 , Chunhai Chen 1
Affiliation  

Herein, MWCNT-graft-polyimides (MWCNT-g-PIs) were prepared by the in situ grafting method. Strengthening the interfacial interaction between MWCNTs and polyimide chains decreased their interfacial thermal resistance (RC). In contrast to the RC of 10% MWCNT/PIs, the RC of 10% MWCNT-g-PI decreased by 16.7%. Hence, MWCNT-g-PIs possessed higher thermal conductivity than MWCNT/polyimides (MWCNT/PIs). Meanwhile, the Tg values of all the samples (MWCNT/PIs and MWCNT-g-PIs) were greater than 399 °C (by DMA). Compared with MWCNT/PIs, 5% and 10% MWCNT-g-PIs showed enhancement in thermal stability in air. The storage modulus retentions were greater than 63% at 200 °C and 45% at 300 °C. Also, 5% and 10% MWCNT-g-PIs maintained the high tensile strength of pure PI, and the tensile modulus increased up to 2.59 GPa on increasing the loading amount of MWCNTs. This study sheds light on improving the thermal conductivity of polyimides effectively at relatively low loadings.

中文翻译:

MWCNT-接枝-聚酰亚胺的原位合成:热稳定性、机械性能和热导率

在此,MWCNT-接枝聚酰亚胺(MWCNT- g - PIs)是通过原位接枝法制备的。加强多壁碳纳米管和聚酰亚胺链之间的界面相互作用会降低它们的界面热阻(RC)。与10% MWCNT/PIs 的R C相比, 10 % MWCNT- g -PI 的R C下降了 16.7%。因此, MWCNT- g -PIs 比 MWCNT/聚酰亚胺 (MWCNT/PIs) 具有更高的热导率。同时,所有样品(MWCNT / PIs 和 MWCNT- g-PIs)的 Tg均大于 399 °C(通过 DMA)。与 MWCNT/PIs 相比,5% 和 10% MWCNT-g -PIs 表现出在空气中的热稳定性增强。储能模量保持率在 200 °C 下大于 63%,在 300 °C 下大于 45%。此外,5% 和 10% MWCNT- g -PIs 保持了纯 PI 的高拉伸强度,随着 MWCNTs 负载量的增加,拉伸模量增加到 2.59 GPa。该研究揭示了在相对较低的负载下有效地提高聚酰亚胺的导热性。
更新日期:2020-04-02
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