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PP/POE/CaCO3复合材料的性能研究 总被引:1,自引:0,他引:1
采用熔融共混工艺制备了聚丙烯/聚烯烃弹性体/碳酸钙(PP/POE/CaCO3)复合材料,研究了POE及CaCO3用量对复合材料力学性能、流变性能及热性能的影响。结果表明:随着POE含量的增加,复合材料的冲击强度显著增大,当POE含量为12%时,冲击强度较纯PP增加233%;同时拉伸强度随POE含量的增加缓慢下降。随着CaCO3含量增加,冲击强度先增加后缓慢下降。 相似文献
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通过采用熔融共混的方法制备了PP/CaCO3复合材料,然后对复合材料的力学性能进行分析,研究了微米级和纳米级CaCO3的表面处理、含量对PP/CaCO3复合材料力学性能的影响规律,并对此影响规律进行合理的解释。 相似文献
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PP/CaCO3低发泡片材的开发研究 总被引:3,自引:0,他引:3
聚丙烯与其他聚烯烃共混改性,可明显提高熔体强度,采用40%CaCO3填充聚丙烯后用RA发泡剂发泡,可制得PP/Ca-CO3低发泡片材(密度为0.904g/cm^3)。该片材具有良好的可降解性,用于替代聚苯乙烯(PS)或纸浆制备一次性餐具,其力学性能可满足使用要求。 相似文献
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对三元复合体系聚丙烯(PP)/聚烯烃弹性体(POE)/纳米CaCO3进行了改性研究,主要探讨了马来酸酐接枝聚丙烯(PP-g-MAH)、乙烯一醋酸乙烯共聚物(EVA)、均聚聚丙烯(PPH)等聚合物对该复合体系性能的影响。研究结果表明,加入适量的接枝物有利于三元复合材料强度的提高,在特定的配比下,PPH和PP3(共聚丙烯)可分别作为该复合体系的熔体流动速率调节剂和增韧剂。 相似文献
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在固定成型工艺条件下,改变纳米CaCO3的添加量,实验采集了该材料的收缩率样本,基于GM(1,1)建立制品收缩率随纳米CaCO3用量变化的预测模型,与实际结果比较,误差在允许的工程误差范围内,证实了该模型的可行性。 相似文献
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PP/POE/Nano-CaCO3复合材料的动态力学热分析 总被引:9,自引:0,他引:9
采用熔融共混工艺制备了聚丙烯(PP)/聚烯烃热塑性弹性体(POE)/纳米CaCO3复合材料。用动态力学试验方法研究了PP/Nano-CaCO3、PP/POE和PE/POE/Nano-CaCO3复合材料的动态力学特征。结果显示:PP/Nano-Ca-CO3PP/POE二元体系的低温内耗峰强度均比PP大;PP/POE/Nano-CaCO3三元复合体系的低温内耗峰强度较之二元体系明显增强,在PE/POE/Nano-CaCO3复合体系中,POE及Nano-CaCO3共同作用使体系tgδ1转变峰逐渐消失,tgδ2峰变宽、增强。利用扫描电子显微镜观察了不同体系的形态,三元复合体系由纯PP的耗能少的空洞化断裂方式逐步向耗能多的基体层屈服方式变化;质量比为100/10/10的PE/POE/Nano-CaCO3复合材料的低温内耗峰强度最大,冲击强度较纯PP提高了178%。 相似文献
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BACKGROUD: Melt vibration technology was used to prepare injection samples of polypropylene (PP)/nano‐CaCO3 blends. It is well known that nano‐CaCO3 particles are easy to agglomerate owing to their large surface energy. Improving the distribution of nano‐CaCO3 particles in PP/nano‐CaCO3 blends is very important for enhancing the mechanical properties. In this work, low‐frequency vibration was imposed on the process of injection molding of PP/nano‐CaCO3 blends. The aim of importing a vibration field was to change the crystal structure of PP as we studied previously and improve the distribution of nano‐CaCO3 particles. Furthermore, the mechanical properties were improved. RESULTS: Through melt vibration, the mechanical properties of PP/nano‐CaCO3 samples were improved significantly. Compared with conventional injection molding, the enhancement of the tensile strength and impact strength of the samples molded by vibration injection molding was 17.68 and 175.96%, respectively. According to scanning electron microscopy, wide‐angle X‐ray diffraction and differential scanning calorimetry measurements, it was found that a much better dispersion of nano‐CaCO3 in samples was achieved by vibration injection molding. Moreover, the crystal structure of PP in PP/CaCO3 vibration samples changed. The γ crystal form was achieved at the shear layer of vibration samples. Moreover, the degree of crystallinity of PP in vibration samples increased 6% compared with conventional samples. CONCLUSION: Concerning the microstructure, melt vibration could effectively change the crystal structure and increase the degree of crystallinity of PP besides improving the distribution of nano‐CaCO3 particles. Concerning the macrostructure, melt vibration could enhance the mechanical properties. The improvement of mechanical properties of PP/nano‐CaCO3 blends prepared by low‐frequency vibration injection molding should be attributed to the even distribution of nano‐CaCO3 particles and the formation of γ‐PP and the increase of the degree of cystallinity. Copyright © 2007 Society of Chemical Industry 相似文献
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The tensile modulus of PP/nanoclay/CaCO3 hybrid ternary nanocomposite was analyzed using composite models. Rule of mixtures, inverse rule of mixtures, modified rule of mixtures (MROM), Guth, Paul, Counto, Hirsch, Halpin–Tsai, Takayanagi, and Kerner–Nielsen models were developed for three‐phase system containing two nanofillers. Among the studied models, inverse rule of mixtures, Hirsch, Halpin–Tsai, and Kerner–Nielsen models calculated the tensile modulus of PP/nanoclay/CaCO3 ternary nanocomposite successfully compared with others. Furthermore, the Kerner–Nielsen model was simplified to predict the tensile modulus by volume fractions of nanofillers. Also, Takayanagi model was modified for the current ternary system. The developed Takayanagi model can predict the tensile modulus using Young's modulus and volume fractions of matrix and nanofillers. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献