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首页> 外文期刊>Materials Chemistry and Physics. >Cure kinetics of vapor grown carbon nanofiber (VGCNF) modified epoxy resin suspensions and fracture toughness of their resulting nanocomposites
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Cure kinetics of vapor grown carbon nanofiber (VGCNF) modified epoxy resin suspensions and fracture toughness of their resulting nanocomposites

机译:气相生长碳纳米纤维(VGCNF)改性的环氧树脂悬浮液的固化动力学及其所得纳米复合材料的断裂韧性

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摘要

In this study, the cure kinetics of Cycom 977-20, an aerospace grade toughened epoxy resin, and its suspensions containing various amounts (1,3 and 5 wt.%) of vapor grown carbon nanofibers (VGCNFs) with and without chemical treatment were monitored via dynamic and isothermal dynamic scanning calorimetry (DSC) measurements. For this purpose, VGCNFs were first oxidized in nitric acid and then functionalized with 3-glycidoxypropyltrimethoxy silane (GPTMS) coupling agent. Fourier transform infrared (FTIR) spectroscopy was subsequently used to verify the chemical functional groups grafted onto the surfaces of VGCNFs. Sonication technique was conducted to facilitate proper dispersion of as-received, acid treated and silanized VGCNFs within epoxy resin. Dynamic DSC measurements showed that silanized VGCNF modified resin suspensions exhibited higher heat of cure compared to those with as-received VGCNFs. Experimentally obtained isothermal DSC data was then correlated with Kamal phe-nomenological model. Based on the model predictions, it was found that silanized VGCNFs maximized the cure reaction rates at the very initial stage of the reaction. Accordingly, an optimized curing cycle was applied to harden resin suspensions. Fracture testing was then carried out on the cured samples in order to relate the curing behavior of VGCNF modified resin suspensions to mechanical response of their resulting nanocomposites. With addition of 1 wt.% of silanized VGCNFs, the fracture toughness value of neat epoxy was found to be improved by 12%. SEM was further employed to examine the fracture surfaces of the samples.
机译:在这项研究中,Cycom 977-20(一种航空航天级增韧环氧树脂)及其悬浮液的固化动力学分别为经过化学处理和未经化学处理的含有各种量(分别为1,3和5 wt。%)的气相生长碳纳米纤维(VGCNF)。通过动态和等温动态扫描量热法(DSC)测量进行监控。为此,首先将VGCNFs在硝酸中氧化,然后用3-环氧丙氧基丙基三甲氧基硅烷(GPTMS)偶联剂进行官能化。随后使用傅立叶变换红外(FTIR)光谱来验证嫁接到VGCNFs表面的化学官能团。进行超声处理技术以促进已接收,酸处理和硅烷化的VGCNF在环氧树脂中的适当分散。动态DSC测量表明,与原样的VGCNF相比,硅烷化的VGCNF改性的树脂悬浮液表现出更高的固化热。然后将实验获得的等温DSC数据与Kamal现象学模型关联。基于模型预测,发现硅烷化的VGCNF在反应的最开始阶段就使固化反应速率最大化。因此,应用了最佳的固化周期以硬化树脂悬浮液。然后对固化的样品进行断裂测试,以便将VGCNF改性的树脂悬浮液的固化行为与其生成的纳米复合材料的机械响应相关联。发现通过添加1wt。%的硅烷化的VGCNF,纯环氧树脂的断裂韧性值提高了12%。进一步使用SEM检查样品的断裂表面。

著录项

  • 来源
    《Materials Chemistry and Physics.》 |2009年第1期|234-242|共9页
  • 作者单位

    Center for Composite Materials (CCM), University of Delaware, Newark, DE 19716, USA Department of Materials Science and Engineering, Anadolu University, Iki Eylul Campus, 26550 Eskisehir, Turkey;

    Center for Composite Materials (CCM), University of Delaware, Newark, DE 19716, USA;

    Center for Composite Materials (CCM), University of Delaware, Newark, DE 19716, USA;

    Department of Mechanical Engineering, Izmir Institute of Technology, 35430 Urla, Izmir, Turkey;

    Center for Composite Materials (CCM), University of Delaware, Newark, DE 19716, USA Department of Electrical and Computer Engineering, University of Delaware, Newark, DE 19716, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    polymers; nanostrcutures; dynamic scanning calorimetry (DSC); fracture and toughness;

    机译:聚合物纳米结构动态扫描量热法(DSC);断裂和韧性;

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