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納米銀對(duì)環(huán)氧樹(shù)脂的增韌改性及其微波固化行為
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科技部科技人員服務(wù)企業(yè)行動(dòng)計(jì)劃項(xiàng)目 (2009GFJ10031)；中國(guó)人民解放軍后勤工程學(xué)院學(xué)術(shù)創(chuàng)新基金項(xiàng)目 (YZ07-42201)


Role of Silver Nanoparticles in Toughening Modification of Epoxy Resin and Microwave Curing Performance
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    摘要:

    在80 ℃雙酚A型環(huán)氧樹(shù)脂E-51中，通過(guò)還原原位構(gòu)筑了超分散穩(wěn)定納米銀 (n-Ag)；用冷凍蝕刻電鏡、離心實(shí)驗(yàn)對(duì)其進(jìn)行表征和分散穩(wěn)定性評(píng)價(jià)；用間歇微波對(duì)分散系中n-Ag的微波吸收特性和環(huán)氧樹(shù)脂的微波固化行為進(jìn)行研究；通過(guò)拉伸試驗(yàn)和沖擊試驗(yàn)考察n-Ag對(duì)環(huán)氧樹(shù)脂的增韌改性行為。結(jié)果表明：銀為30 nm的粒狀顆粒，大小均勻，有理想的分散穩(wěn)定性; n-Ag對(duì)環(huán)氧樹(shù)脂有顯著地增韌作用，當(dāng)其含量為2.0%～2.5%(質(zhì)量分?jǐn)?shù))時(shí)，增韌改性效果最佳，復(fù)合材料的斷裂伸長(zhǎng)率可提高l10%～130%；原位合成n-Ag有良好的微波吸收特性，它的存在能明顯減少環(huán)氧樹(shù)脂的微波固化時(shí)間，當(dāng)n-Ag含量超過(guò)2.5%時(shí)，微波固化時(shí)間可縮短38%；微波固化環(huán)氧樹(shù)脂速度比傳統(tǒng)加熱固化速度快數(shù)倍, 其抗拉伸強(qiáng)度和抗沖擊強(qiáng)度也好于熱固化，但拉伸斷裂伸長(zhǎng)率比熱固化的小

    Abstract:

    The sliver nanoparticles (n-Ag) were synthesized in-situ in bisphenol-A epoxy resin(E-51) by acetaldehyde at 80 ℃. The size, size distribution and conglomeration behavior of n-Ag were observed by freeze-etching replication transmission electron microscopy(FRTEM). The centrifuge tests were used for evaluating the dispersion and dispersion stability of n-Ag. The microwave-absorbing properties of n-Ag synthesized in-situ and the microwave curing performance of epoxy resin dispersion system containing n-Ag were studied by pulse microwave. The toughening modification effect of epoxy resin were evaluated by tensile test. The results show that n-Ag is composed of spherical particles with a homogeneity and the average size of 30 nm. The n-Ag can maintain stability, no sedimentation and no agglomeration appear in the dispersion system. n-Ag synthesized in-situ have a good microwave-absorbing property, and it can obviously decrease the microwave curing time of modified epoxy resin. The curing time of 2.5% n-Ag epoxy resin is 38% less compared to that of epoxy resin. The microwave curing rate of n-Ag epoxy resin dispersion system is several times faster than the traditional heating curing. The silver nanoparticles have a significant toughening function to epoxy resin. The toughening effect to epoxy resin is best when the mass ratio of the resin to ultra-dispersion-stability n-Ag is 2% to 2.5%. Under this situation, fracture elongation of the composite material increases by about 110%-130% compared with unmodified resin

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歐忠文,白 敏,陳 云,陳 喬,陳寒斌.納米銀對(duì)環(huán)氧樹(shù)脂的增韌改性及其微波固化行為[J].稀有金屬材料與工程,2012,41(4):649~652.[Ou Zhongwen, Bai Min, Chen Yun, Chen Qiao, Chen Hanbin. Role of Silver Nanoparticles in Toughening Modification of Epoxy Resin and Microwave Curing Performance[J]. Rare Metal Materials and Engineering,2012,41(4):649~652.]
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  • 收稿日期:2011-04-08
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