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采用自制的淀粉纳米晶(SNC)对玻璃纤维进行表面处理,增加其与环氧树脂基体的界面剪切强度(IFSS)。研究了处理方式、处理时间、SNC乙醇分散液浓度、热处理温度等工艺参数对SNC在玻璃纤维表面沉积情况的影响,以及对改性玻璃纤维与环氧树脂的界面性能的影响规律。采用扫描电子显微镜、单纤维强力仪对处理前后玻璃纤维进行表征,并采用微脱粘法测试玻璃纤维与环氧树脂的界面粘结情况。结果表明,当重力静置处理时间24 h,SNC乙醇分散液浓度为1 g/100 m L时,SNC在玻璃纤维表面均匀沉积,且能显著提高玻璃纤维与环氧树脂的IFSS,为27.29 MPa,较未处理的纤维增加29.3%。150℃热处理4 h后,X射线光电子能谱结果显示SNC与玻璃纤维形成化学键合,进一步增加纤维与环氧树脂的界面粘结,IFSS值达到32.30 MPa,较未处理的纤维增加53%,且纤维的拉伸强度得到较好的维持。 相似文献
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通过2,4-甲苯二异氰酸酯(TDl)与淀粉纳米晶(NST)在有机溶剂中的接枝反应制备了TDI改性淀粉纳米晶(NTST),然后将其与聚丁二酸丁二醇酯(PBS)熔融共混制备了PBS/NTST复合材料.改性淀粉纳米晶的红外光谱分析、X-射线衍射分析、润湿性实验和接触角测试结果表明,接枝反应成功进行,改性后的淀粉纳米粒子具有亲... 相似文献
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以聚乳酸(PLA)和淀粉纳米晶(SNC)为主要原料,聚乙二醇(PEG)为增塑剂,采用溶剂蒸发法制备PLA/SNC和PLA/SNC/PEG复合材料,通过差示扫描量热仪(DSC)、热台偏光显微镜(PLM)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)等研究了PEG对复合材料结晶行为、力学性能及界面相容性的影响。结果表明,PEG能够与SNC协同促进PLA结晶,使PLA/SNC/PEG复合材料的结晶速率明显提高;PEG的添加未改变PLA/SNC复合材料的结晶结构;随着PEG含量的增加,PLA/4%(质量分数,下同)SNC复合材料的拉伸强度先升高后下降,断裂伸长率不断提高;当PEG含量为2%时,PLA/4%SNC/2%PEG复合材料的力学性能最佳,拉伸强度为47.86 MPa,断裂伸长率为10.20%,PLA与SNC间界面相容性得到改善。 相似文献
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改性蒙脱石增强增韧环氧树脂纳米复合材料性能研究 总被引:24,自引:0,他引:24
采用有机蒙脱石改性环氧树脂,利用插层复合技术制备出了纳米级的环氧树脂/蒙脱石复合材料;测试了其力学性能和热性能。并通过X射线衍射(XRD)、动态力学性能测试(DMA)等手段研究了复合材料的微观结构和动态力学行为。研究结果表明:力学性能实现了增韧增强,抗冲击强度提高了60.67%,抗张强度提高了11.78%,热变形温度也提高了8.7℃。 相似文献
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树脂类结合荆工具,是超硬材料制品分类中的重要组成部分之一.为了改善环氧树脂的综合应用性能,试验以纳米氢氧化铝作为增强体,分析评价了制备的纳米复合材料的阻燃和机械性能.试验结果表明,油酸钠是氢氧化铝改性的有效表面活性荆,其在氢氧化铝中的添加量达到1%时改性效果最好,氢氧化铝的活化指数可以达到98.21%.复合材料的阻燃性能随着氢氧化铝填充量的增大而提高,而机械性能则随填充量的增大先提高后减小.为使复合材料有较佳的综合性能,纳米氢氧化铝在环氧树脂中的适宜填充量为60%~80%. 相似文献
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Nancy L. García Laura Ribba Alain Dufresne Mirta I. Aranguren Silvia Goyanes 《大分子材料与工程》2009,294(3):169-177
Nanocomposites of cassava starch reinforced with waxy starch nanocrystals were prepared. They showed a 380% increase of the rubbery storage modulus (at 50 °C) and a 40% decrease in the water vapor permeability. X‐ray spectra show that the composite was more amorphous than the neat matrix, which was attributed to higher equilibrium water content in the composites. TGA confirmed this result and its thermal derivative suggested the formation of hydrogen bonding between glycerol and the nanocrystals. The reinforcing effect of starch nanocrystals was attributed to strong filler/matrix interactions due to the hydrogen bonding. The decrease of the permeability suggests that the nanocrystals were well dispersed, with few filler/filler interactions.
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Sulfuric acid-catalyzed hydrolysis of cellulose commonly isolates cellulose nanocrystals (CNCs). Neutralizing the reactant solution with sodium hydroxide facilitates efficient downstream processing, but residual salt remains in the product. This study examines the reinforcing effects of CNCs from suspensions that contain residual salt on the mechanical properties of thermoplastic starch nanocomposites. By reinforcing starch films with up to 5 wt% CNCs, stiffness and strength are improved by 118% and 79%, respectively, indicating a good dispersion of CNCs in the starch matrix. Compared to nanocomposites incorporating salt-free CNCs, the remaining salt has no significant impact on the material's mechanical performance. The results indicate great potential of CNCs containing residual salt as biobased, low-cost nanofiller in hydrophilic polymer matrices. 相似文献
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《国际聚合物材料杂志》2012,61(6):330-335
Hyperbranched polyurea modified nanoclay was used for the preparation of vegetable oil modified sulfone epoxy nanocomposites at different loadings (1–5 wt%) for the first time. The bio-based nanocomposites were characterized by XRD, SEM, TEM, and FTIR techniques. These nanocomposites showed an enhancement of thermal stability up to 48°C as revealed by thermo-gravimetric analysis. The nanocomposites with 5 wt% of nanoclay exhibited more than 300 percent improvement in tensile strength, though the elongation at break decreases with the increase of nanoclay loading. Thus the studied nanocomposites possess better performance over the pristine system. 相似文献
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探讨了反应时间和温度等因素对水性环氧乳化剂环氧值测定结果的影响。实验结果表明:在45℃下,试样与盐酸-丙酮溶液反应2 h,水性环氧乳化剂环氧值的测定值与理论值最接近,相对误差在0.4%以下,比国标GB 1677—1981方法产生的相对误差(6.5%以上)有明显降低。 相似文献