Effect of multi-walled carbon nanotubes with different diameters on morphology and thermal and mechanical properties of flexible polyurethane foams

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-05-13 DOI:10.1177/02624893211017284

Fukai Yang, Miao Xie, Zhang Yudi, Xinyu Xu

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引用次数: 3

Abstract

We report flexible polyurethane foams (PUFs) containing –OH functionalized multi-walled carbon nanotubes (MWCNTs) with different diameters (10–20 nm, 20–30 nm, >50 nm) from 0.1–0.6 wt% (per 100 resins of polyol by weight) prepared via in situ polymerization. After synthesis, the morphology of the MWCNT/PUF composites was observed through scanning electron microscopy (SEM) based on MWCNT amount. The MWCNTs acted as nucleating agents and increased the matrix viscosity. The pore size of the composites decreased and the number of pores increased with increasing MWCNT concentration. Dynamic mechanical analysis (DMA) showed that the storage modulus of the composites increased, the loss modulus decreased, and the Tg gradually decreased with increasing MWCNT content. The incorporation of MWCNTs induced remarkable thermal stabilization of the matrix. The increase in the degradation temperature from 294°C to 304°C resulted in a 50% weight loss. The mechanical properties of the MWCNT/PUF materials increased with increasing MWCNT proportion because of the excellent compatibility and strong interface interaction between the MWCNT and flexible PUF.

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不同直径的多壁碳纳米管对柔性聚氨酯泡沫形态及热力学性能的影响

我们报道了通过原位聚合制备的含有–OH官能化多壁碳纳米管（MWCNTs）的柔性聚氨酯泡沫（PUFs），其具有0.1–0.6 wt%（每100种多元醇树脂重量）的不同直径（10–20 nm，20–30 nm，>50 nm）。合成后，基于MWCNT的量，通过扫描电子显微镜（SEM）观察了MWCNT/PUF复合材料的形态。MWCNT起到成核剂的作用，提高了基体的粘度。随着MWCNT浓度的增加，复合材料的孔径减小，孔数增加。动态力学分析（DMA）表明，随着MWCNT含量的增加，复合材料的储能模量增加，损耗模量降低，Tg逐渐降低。MWCNTs的掺入引起了基质的显著热稳定性。降解温度从294°C增加到304°C，导致50%的重量损失。MWCNT/PUF材料的力学性能随着MWCNT比例的增加而增加，这是因为MWCNT与柔性PUF之间具有良好的相容性和较强的界面相互作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.