共查询到19条相似文献,搜索用时 187 毫秒
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PP/CaCO3复合体系的力学性能及其影响因素 总被引:9,自引:2,他引:7
考察了PP基体种类,偶联剂种类,CaCO3添加量,加工条件,助偶联剂及橡胶弹性体等因素对PP/CaCO3复合材料力学性能的影响,实验结果表明:铝酸酯或烷基羧酸盐等作为PP/CaCO3复合体系的偶联剂,可使PP/CaCO3复合体系即使在CaCO3高添加量的情况下,其冲击韧性也可得到一定提高;而助偶联剂改性石蜡或橡胶弹性体EPDM的添加,可使PP/CaCO3复合体系的冲击强度得到进一步的改善;PP/C 相似文献
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本文通过对回收LDPE/CaCO3填充、回收LDPE/HDPE共混、回收LDPE/PP共混体系的研究,得出了较好力学性能的土工排水带板芯的配方. 相似文献
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高冲击韧性PP/EPDM/CaCO3复合材料研究 总被引:17,自引:3,他引:14
通过在以烷基羧酸盐为表面处理剂的PP/CaCO3复合体系中添加改性聚烯烃和EPDM的方法,研制了高冲击韧性PP/EPDM/CaCO3复合材料,在该材料中,由于烷基羧酸盐可以和CaCO3发生某种物理化学作用,被牢固地键接在CaCO3表面上,且改性聚烯烃能与烷基羧酸盐的长链末端产生良好的分子间力作用,并对EPDM橡胶弹性体中聚乙烯部分发生选择性相容,使EPDM倾向于包覆在CaCO3表面上,相当于增大了 相似文献
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纳米级CaCO3填弃PVC/CPE复合材料研究 总被引:31,自引:1,他引:30
探讨了内米级CaCO3粒子增韧增强PVC/CPE基理,研究了纳米级CaCO3与轻质CaCO3用量对PVC/CPE体系力学性能的影响。结果表明:纳粘级CaCO3用量为5%~12%时体产伸强主菩工都有明显提高,起到了增韧、增强的双重效果。轻质CaCO3填充PVC/CPE体系基本未见地韧效果,同时,随着轻质CaCO3用量的增加,体系的拉伸强度和断裂伸长率明显降低。 相似文献
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通过钛酸四异丙酸与甲基丙烯酸甲酯-丙烯酸丁酯-丙烯酸共聚物和第三组分焦磷酸二异辛酯合成出新型大分子钛酸酯偶联剂,处理CaCO3填充聚氯乙烯。对PVC/CaCO3复合体系的形态,动态力学行为和热稳定性进行了研究。结果表明,MTCA可增加PVC与CaCO3之间的相互作用,改善了体系的相态结构,提高了体系的热稳定性和PVC的玻璃化变温度。 相似文献
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振动力场强化聚合物反应挤出过程的研究 总被引:2,自引:0,他引:2
介绍了将电磁场引起的机械振动力场引入聚合物反应挤出过程的作用和基本作用原理。引入振动力场可以对挤出机内的物理和化学反应产生积极影响,改善聚合物熔体的粘弹性,提高聚合物混炼和动态硫化效果。该方法可用于提高动态硫化EPDM/PP热塑性弹性体的质量。 相似文献
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PP/SBS/纳米CaCO3复合材料结构与性能研究 总被引:5,自引:2,他引:5
研究了PP/SBS/纳米CaCO3复合材料的力学性能以及SBS分散相颗粒和纳米CaCO3粒子在PP基体中的分散状况。结果表明,纳米CaCO3粒子的加入使复合材料的缺口冲击强度、弯曲弹性模量、拉伸强度均得到提高。透射电镜观察发现,纳米CaCO3粒子的加入使复合体系的熔体黏度增大,对弹性体SBS的分散起到剪切细化、均化的作用,从而起到协同增韧效应。 相似文献
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A self‐made dynamic capillary rheometer (DCR) was designed to investigate the dynamic viscoelastic characteristic of polypropylene (PP) melt during the pulsatile pressure extrusion. A vibration force field was parallel superposed upon steady shear flow in this DCR by means of a vibration driven piston. During the pulsatile pressure extruding process in DCR, the PP melt displayed apparent viscoelasticity. The experiment results proved the pressure pulsatile extrusion could reduce the viscosity of polymer melts effectively. The phase difference between the shear stress and the shear rate decreased with the superposed vibration. But, at large amplitude conditions, the viscosity has an increasing tendency. This maybe illuminated that large amplitude could be harmful for the vibration‐assistant polymer processing. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1834–1838, 2006 相似文献
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A vibration force field was applied to the whole process of polymer plasticating extrusion by periodical vibration of the screw. It observably affected both the extruder screw extrusion characteristics and the round-section die extrusion characteristics. It also affected the polymer plasticating extrusion process and the quality of the extrudates. An analytical model of typical dynamic extrusion of round-section dies was created. The results showed that a vibration force field can improve extrusion output. 相似文献
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The effects of vibration force field on mechanical properties of blends of EPDM/PP during process of plastics in tri-screw dynamic mixing extruders were investigated experimentally. It was found that vibration force field enhanced mechanical properties of blends of EPDM/PP, and the amplitude of enhancement varied as EPDM content varying. The yangs modulus, the impact strength and the tensile strength were improved the maximum 17, 28, and 17.3%, respectively under dynamic conditions than that under steady conditions. Mechanical properties of blends of EPDM/PP represented a tendency of a rising followed by a fall with the increase of vibration frequency and amplitude. 相似文献