共查询到19条相似文献,搜索用时 937 毫秒
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以废聚氨酯(PU)改性热塑性弹性体苯乙烯-丁二烯-苯乙烯共聚物(SBS),探讨了废PU用量、相容剂对废PU/SBS复合材料的物理机械性能的影响以及废PU对含填料轻质碳酸钙(CaCO3)的SBS性能的影响;并采用相差显微镜观察了复合材料的亚微观结构.结果表明,废PU质量在15份左右时,废PU/SBS复合材料的综合性能最佳;相容剂虽然能够改善复合材料的界面,但是对宏观力学性能影响不大;废PU能够很好地改善CaCO3 /SBS的界面性质,同时大幅度提高了物理机械性能,用废PU改性的CaCO3/SBS材料具有较高的性价比. 相似文献
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研究了废聚氨酯(PU)改性热塑性弹性体苯乙烯-丁二烯-苯乙烯(SBS)共聚物的性能;探讨了废PU用量、相容剂和轻质碳酸钙(CaCO3)对废PU/SBS复合材料物理机械性能的影响;用相差显微镜观察了复合材料的亚微观结构.结果表明,废PU用量为15份时,废PU/SBS复合材料综合性能最佳;相容剂虽然能够改善复合材料的界面状态,但对力学性能影响不大;废PU能够很好地改善CaCO3 /SBS的界面性质,同时大幅度地提高了物理机械性能,是一种具有高性能价格比的热塑性弹性体材料. 相似文献
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烷基化聚酯超分散剂改性纳米CaCO3及其在PVC中的应用 总被引:4,自引:0,他引:4
探讨了不同改性剂、改性温度对纳米CaCO3的活化指数的影响,考察了改性纳米CaCO3前后中的DOP糊黏度和增塑剂吸收量的变化。结果表明:烷基化聚酯超分散剂干法改性纳米CaCO3比NDZ-201偶联剂湿法改性纳米CaCO3更有效,其最佳用量为4%,最佳改性温度为110℃。烷基化聚酯超分散剂改性纳米CaCO3/BOP糊黏度降低了87.6%,增塑剂吸收量降低了53.9%。烷基化聚酯超分散剂改性纳米CaCO3对PVC材料具有增强、增韧作用。 相似文献
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研究纳米CaCO3不同含量共混对PVC的增韧增强改性影响,结果表明纳米CaCO3用量为10%时PVC样品冲击强度和拉伸强度达到最大值,同时随着纳米CaCO3加入量的增加,断裂伸长率一直呈下降趋势。综合实验数据,加工性能良好的PVC中纳米CaCO3的加入量控制在5%~10%较为适宜。 相似文献
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废聚氨酯改性聚氯乙烯的性能研究 总被引:5,自引:1,他引:5
对废聚氨酯(PU)改性聚氯乙烯(PVC)的性能进行了研究,探讨了废PU、热塑性聚氨酯(TPU)、轻质碳酸钙(CaCO3)和羟基磷酸钙[Ca5(PO4)3OH]对PVC力学性能和耐溶剂性能的影响.实验结果表明,废PU使软质PVC的强度下降,伸长率提高,TPU可以提高软质PVC的强度和伸长率;废PU在PVC中起到大分子增塑剂的作用,用废PU取代增塑剂DOP不但可以大幅度提高PVC的强度,同时还提高了冲击强度和断裂伸长率;轻质CaCO3使废PU/PVC复合材料的撕裂强度下降,Ca5(PO4)3OH却可以使材料的撕裂强度提高. 相似文献
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研究了一维CaSO4晶须、二维滑石粉、三维重质CaCO3和零维纳米CaCO3对复合改性聚氯乙烯(PVC)的力学性能影响,分析了改变多维无机材料的比例对改性PVC的性能影响。结果表明,与其他无机材料复合改性PVC相比,一维CaSO4晶须、二维滑石粉、三维重质CaCO3复合改性PVC的综合性能最好,加工性能最佳;一维CaSO4晶须和零维纳米CaCO3添加量为10份时复合改性PVC的冲击性能达到最大值;一维CaSO4晶须、三维重质CaCO3、二维滑石粉按照4/2/1的质量比复合改性PVC时综合性能最佳。 相似文献
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Even at low content, polypropylene significantly worsens mechanical properties of the recycled PVC composite, i.e. tensile strength at break and elongation at break. But, if small quantities of surface modified nanofiller calcium carbonate is added, an applicable composite that contains 10–30% of waste material can be made. It was determined that nanosized calcium carbonate lowers melting point of polypropylene, perhaps by changing its crystalline form and has no influence on thermooxidative degradation of poly(vinyl chloride). Addition of nanofiller slightly lowers the surface free energy of the composites what is more prone when the low content of polypropylene is present. The recovery of tensile strength and elongation at break occurs and those properties reach the highest value at about 6% of CaCO3. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers 相似文献
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Using ultrafine calcium carbonate to reinforce natural rubber latex film, the effect of its content on latex properties such as surface tension, viscosity, mechanical stability, and heat stability and the physical properties of latex film before and after aging such as tear strength, modulus, and tensile strength were investigated. The results showed that the surface tension of natural rubber latex reinforced by ultrafine calcium carbonate only changed slightly; when the content of calcium carbonate was less than 20%, the change of viscosity was not obvious, but when the content was greater than 20%, the viscosity significantly lowered. Ultrafine calcium carbonate could effectively improve the tear strength, tensile strength, and modulus of the natural rubber latex film. The modulus increased with the increment of the calcium carbonate. When the content of calcium carbonate was less than 15%, the tear strength and tensile strength increased with the increments of calcium carbonate, but when the content was greater than 15%, the above‐mentioned properties decreased with the increment of calcium carbonate. By comprehensive consideration, the best reinforcing effect was obtained at a content of 15% ultrafine calcium carbonate. The particle diameters of calcium carbonate and their distribution in the calcium carbonate emulsion and in the rubber film were analyzed with SEM and a laser particle size tester, which showed that the distribution of calcium carbonate in the latex film was even and that it could effectively reinforce natural rubber latex film. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 982–985, 2003 相似文献
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改性纳米碳酸钙粉体的制备及其耐酸性 总被引:5,自引:0,他引:5
公共沸蒸馏脱水后的纳米碳酸钙-正丁醇悬浮液中直接加入硬脂酸,制备了改性纳米碳酸钙粉体,确定了改性剂硬脂酸的最佳用量为纳米碳酸钙质量的3%。每100g改性纳米碳酸钙的吸油值为49.4g,活化度高达99.9%,比表面积为30.32m^2/g。用透射电镜,红外光谱分析,BET(Brunauer-Emmett-Teller)法等对改性纳米碳酸钙进行了表征。研究了改性纳米碳酸钙的耐酸的和耐酸性原因.即粒子表面形成的有机包敷层,使碳酸钙产生了一定的耐酸性能。 相似文献
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