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PP/POE/纳米CaCO3复合材料的制备与性能研究 总被引:3,自引:0,他引:3
采用逐级分散共混法,制备了PP/POE/纳米CaCO3复合材料,研究了其力学性能和微观结构。逐级分散法先制备纳米CaCO3母料,然后将PP分多次加入含纳米CaCO3的共混体系中,目的在于改善纳米CaCO3的分散,以提高复合材料的力学性能。研究结果表明:采用逐级分散法制备的PP/POE/纳米CaCO3复合材料的冲击强度为64.2kJ/m^2,比直接共混法高16.9%,比通常的母料法高9.7%。复合材料的微观结构研究表明:纳米CaCO3粒子基本上都分布在连续相PP中。 相似文献
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研究了纳米CaCO3/EPO/PP复合材料的力学性能、熔体流变性能及纳米CaCO3粒子在PP基体中的分散状况。结果表明:弹性体EPO对PP有很好的增韧效果,当EPO用量为4份时,PP从脆性断裂转变成韧性断裂;当EPO用量为10份时,PP复合材料的室温和低温缺口冲击强度均有大幅度的提高。在EPO/PP复合材料中加入纳米CaCO3不仅可以显著提高复合材料的室温和低温缺口冲击强度,而且可显著提高复合材料的弯曲弹性模量和MFR,改善复合材料的加工流动性能;纳米CaCO3粒子在PP中达到了纳米级分散。 相似文献
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用超重力法制备的纳米CaCO3和PP熔融共混制备了PP/CaCO3复合材料,并对PP/CaCO3复合材料的结晶行为进行了详细研究。差示扫描量热分析表明,纳米CaCO3粒子的加入加快了PP的结晶速率,缩短了半结晶时间,130℃时含15份纳米CaCO3的PP/CaCO3复合材料的半结晶时间比纯PP的减少了8.92 min;结晶度有轻微下降,结晶温度为126.5 ℃时纯PP的结晶度为44.33 %,含15份纳米CaCO3的PP/CaCO3复合材料的结晶度为35.9 %。动力学研究数据表明,等温结晶过程符合Avrami方程,PP/CaCO3的n和k值都大于纯PP的;利用偏光显微镜观察了PP/CaCO3复合材料的结晶形貌及结晶生长过程,纳米CaCO3粒子的加入使球晶数量明显增多,意味着CaCO3起到了结晶成核剂的作用。 相似文献
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研究了苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)单独添加和与纳米CaCO3复配添加对聚丙烯/苯乙烯-丙烯腈共聚物(PP/SAN)共混体系相容性的影响。结果表明:SBS用量为6 phr时,体系的分散性尺寸降低,分布均匀性改善,有一定的增容效果,但当其用量为10 phr时,体系的相容性变差;SBS和纳米CaCO3先在双辊塑炼机上混炼后再复配添加,当纳米CaCO3/SBS质量比为2/1、总添加量为10 phr时,增容效果好于单独添加SBS的体系;改变纳米CaCO3/SBS的配比体,系的拉伸强度和缺口冲击强度变化不大。 相似文献
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Jianghua Yu Guoquan Wang Jianfeng Chen Xiaofei Zeng Wenyi Wang 《Polymer Engineering and Science》2007,47(3):201-206
Nanocomposites of nanosized CaCO3/SBS/PP were prepared by using twin‐screw and single‐screw extruder. By adding nanosized CaCO3 particles into SBS/PP blend, the notched impact strength, flexural modulus, and tensile strength of the composites can be improved, whereas, by adding microsized CaCO3 particles into SBS/PP blend, the notched impact strength of the composite is decreased markedly. At nanosized CaCO3 content of 16 phr (parts per hundred PP resin by weight), the impact strength of nanosized CaCO3/SBS/PP composite reaches 56.55 KJ/m2, which is 1.27 times that of SBS/PP blend. At nanosized CaCO3 content of 4 phr, the tensile strength of the composites reaches 31.3 MPa, which is 1.23 times that of SBS/PP blend. The maximum and balanced torque of the composites improves significantly by the addition of CaCO3 nanoparticles. The increased shear force during compounding continuously breaks down SBS particles, resulting in the reduction of the SBS particles size, and improving the dispersion of SBS particles in PP matrix. Thus the toughening effect of SBS on matrix was improved. Simultaneously, the existence of SBS provides the matrix with a good intrinsic toughness, satisfying the condition that nanosized inorganic particle of CaCO3 efficiently toughens polymer matrix. The synergistic toughening function of nanosized CaCO3 and SBS on PP matrix was exhibited. POLYM. ENG. SCI. 47:201–206, 2007. © 2007 Society of Plastics Engineers 相似文献
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Oleic acid (OA)-modified CaCO3 nanoparticles were prepared using surface modification method. Infrared spectroscopy (IR) was used to investigate the structure of the modified CaCO3 nanoparticles, and the result showed that OA attached to the surface of CaCO3 nanoparticles with the ionic bond. Effect of OA concentration on the dispersion stability of CaCO3 in heptane was also studied, and the result indicated that modified CaCO3 nanoparticles dispersed in heptane more stably than unmodified ones. The optimal proportion of OA to CaCO3 was established. The effect of modified CaCO3 nanoparticles on crystallization behavior of polypropylene (PP) was studied by means of DSC. It was found that CaCO3 significantly increased the crystallization temperature, crystallization degree and crystallization rate of PP, and the addition of modified CaCO3 nanoparticles can lead to the formation of β-crystal PP. Effect of the modified CaCO3 content on mechanical properties of PP/CaCO3 nanocomposites was also studied. The results showed that the modified CaCO3 can effectively improve the mechanical properties of PP. In comparison with PP, the impact strength of PP/CaCO3 nanocomposites increased by about 65% and the flexural strength increased by about 20%. 相似文献
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高流动性PP/POE/纳米CaCO3复合材料的研制 总被引:5,自引:0,他引:5
利用双螺杆挤出机,通过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。利用扫描电子显微镜(SEM)观察了不同体系的形态,结果显示:纳米CaCO3和POE在PP/POE/nano-CaCO3中互相促进分布及均化。冲击试验结果表明:PP/POE/nano-CaCO3体系的缺口冲击强度较PP/POE、PP/nano-CaCO3和纯PP分别提高了65%,107%和178%。熔体流动速率测试显示:纳米CaCO3在PP/POE/nano-CaCO3中具有提高体系流动性的作用。 相似文献
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双单体改性对纳米CaCO3/PP结晶与熔融行为的影响 总被引:2,自引:0,他引:2
制备了界面改性纳米CaCO3/PP复合材料,用DSC研究了在有、无过氧化二异丙苯(DCP)存在下,反应单体丙烯酸(AA)及苯乙烯(St)对PP结晶与熔融行为的影响。结果表明:AA改性纳米CaCO3/PP可使结晶温度提高;St改性使纳米CaCO3/PP的结晶温度降低,但在DCP存在下结晶温度反而提高。AA和St双单体改性使纳米CaCO3/PP的结晶温度明显降低,但加有DCP的双单体改性却使纳米CaCO3/PP的结晶温度大幅提高,说明双单体接枝物有促进纳米CaCO3表面成核的作用。 相似文献
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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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制备了反应性单体改性纳米CaCO3填充PP复合材料,研究了反应性单体丙烯酸(AA)和苯乙烯(St)在有、无过氧化二异丙苯(DCP)存在下改性纳米CaCO3填充PP复合材料的力学性能,并用扫描电子显微镜(SEM)研究了复合材料弯曲断面的形态。结果表明,PP/改性纳米CaCO3的力学性能优于PP/微米CaCO3的力学性能;在DCP存在下,AA、AA与St混合改性可使PP/纳米CaCO3的拉伸性能和弯曲性能提高,减小拉伸强度随CaCO3含量增加而下降的趋势;并可有效提高纳米CaCO3在基体中的分散性和界面粘结性。 相似文献