聚丙烯／纳米碳酸钙复合材料性能的研究

从结晶性能、力学性能、热性能和微观结构几个方面对PP/nmCaCO3复合材料做了初步的研究,发现nmCaCO3对PP的结晶有明显的异相成核作用,对PP的力学性能和热性能有一定的提高。     

聚丙烯／纳米碳酸钙原位聚合复合材料的结晶特性研究

采用DSC方法，研究了四种不同纳米CaCO3含量的PP／CaCO3纳米原位聚合复合材料的结晶特性，并通过偏光显微镜观察了其结晶结构，同时和纯PP进行了比较。结果表明，纳米CaCO3在PP中具有成核作用，PP以异相成核方式结晶，使PP的结晶温度提高，结晶速率增大，球晶颗粒变小。从纳米CaCO3含量对PP结晶特性的研究可知，其含量在2％～3％时，对PP的上述结晶行为影响最为明显。     

2000t／a无机填充聚丙烯的开发及应用

根据1979年北京化工研究院与山西省化工研究所采用OL-T951钛酸酯偶联剂,使PP-CaCO_3共混物偶合,形成无机填充聚丙烯的新材料,我厂利用该项小试成果,在国产D150mm大型真空挤塑模面热切粒机组进行工业装置试验,获得开发成功。从而形成2000t/a无机填充聚丙烯生产能力。并在投放市场广泛应用的十年中,取得较好的经济效益和社会效益。产品质量不仅保持聚丙烯本身固有的良好性能,例如机械性能、电绝缘性和耐热性,而且极大地改善了PP本身的主要缺陷,如尺寸稳定性和低温脆性。     

聚丙烯／碳酸钙复合材料的研制

文章以注塑级PP为基础料,以1250目碳酸钙对其进行填充改性,采用钛酸酯偶联剂对碳酸钙进行表面处理可得到活化碳酸钙,随活化碳酸钙添加量增加,PP／碳酸钙复合材料的拉伸强度、弯曲强度、弯曲模量等逐渐增加。以POE对PP／碳酸钙复合材料进行增韧改性,可使复合材料的冲击强度逐渐增加,而拉伸强度、弯曲模量均逐渐降低。表面改性剂TAS-2能够明显地改善PP／碳酸钙复合材料的表面光滑性。     

聚丙烯/纳米碳酸钙复合材料性能的研究

利用双螺杆挤出机制备了聚丙烯(PP)/活性纳米碳酸钙(nano-CaCO3)复合材料,并用注射机注射了标准拉伸、弯曲及冲击样条。研究了不同纳米碳酸钙质量含量(1%～8%)对复合材料流动性能及力学性能的影响,利用扫描电镜观察了复合材料冲击断面的形貌。研究结果表明在实验范围内,与纯PP相比,加入纳米碳酸钙后,复合材料的拉伸强度有所降低,而弯曲强度、冲击强度以及硬度增加。当纳米碳酸钙含量为3%时复合材料呈现比较好的综合性能。实验条件下,纳米碳酸钙对复合材料的流动性能影响不大。     

偶联剂改性对PVC/碳酸钙复合材料性能的影响

采用钛酸酯偶联剂对碳酸钙进行表面改性,分析了偶联剂在碳酸钙表面改性的机理,并研究了其对聚氯乙烯(PVC)复合材料性能的影响.结果 表明,大部分的钛酸酯偶联剂通过化学键合作用覆盖在碳酸钙表面,偶联剂相对于碳酸钙使用量1.5％时,活化指数在95％以上;偶联剂可以明显改善PVC/钙粉复合材料的力学性能、热稳定性以及耐热性.     

钛酸酯偶联剂对碳酸钙表面改性效果的研究

本文就钛酸酯偶联剂对钛酸钙的表面改性效果进行了一些研究 ,测试了改性前后UP树脂浇注体、GFRP的力学性能 ,并对其作用机理进行了一些探讨     

聚丙烯接枝马来酸酐对聚丙烯/凹凸棒石复合体系力学性能的影响

使用聚丙烯接枝马来酸酐(PP-g-MAH)对聚丙烯(PP)/凹凸棒石(AT)复合体系进行了增容,研究了PP-g-MAH对PP/原矿AT和PP/钛酸酯偶联剂改性AT复合体系力学性能的影响,观察了AT在PP中的分散状态以及PP/AT复合体系的断面形貌.结果表明P-g-MAH对AT在PP中分散状态没有明显影响;但加入5%的PP-g-MAH能够改善PP与原矿AT的相容性,提高PP/原矿AT复合体系的力学性能;加入PP-g-MAH对PP/钛酸酯偶联剂改性AT复合体系力学性能的改善不明显.     

钛酸酯表面处理碳酸钙的研究

介绍了钛酸酯偶联剂表面处理碳酸钙的原理和方法。研究了表面处理后，碳酸钙填充性、碳酸钙／液体石蜡体系粘度的变化，以及钛酸酯用量、反应温度对表面处理效果的影响。测定了改性碳酸钙的红外光谱和差热曲线，并讨论了其在橡胶中的应用效果。     

专利：增强增韧抗老化聚丙烯／纳米碳酸钙复合材料及其制备方法

本发明公开了一种增强增韧抗老化聚丙烯／纳米碳酸钙复合材料,由PP类树脂100重量份、复合偶联剂2—30重量份、长玻纤2—30重量份、复合增韧剂5—40重量份、纳米填充材料5—40重量份、复合抗氧剂0．2—2重量份、加工助剂0．5—5重量份组成。     

纳米CaCO_3含量对PP/SBS/CaCO_3复合材料力学性能的影响

通过双螺杆共混方法制备聚丙烯(PP)/苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)/Ca-CO3复合材料,并采用扫描电镜(SEM)、力学性能测试和偏光显微镜研究了纳米CaCO3用量对该复合体系微观结构、力学性能以及结晶形貌的影响。结果表明:纳米CaCO3粒子在PP中均匀地分散可细化晶粒并起到了增韧增强的效果。当加入纳米CaCO3的质量分数为2%时,其综合性能最好。     

Morphology and mechanical properties of PP/POE/nano‐CaCO3 composites

The mechanical properties including tensile, flexural, and impact of the nanometer on calcium carbonate (nano‐CaCO₃) filled polypropylene (PP)/poly (ethylene‐co‐octene) (POE) composites were measured at room temperature to identify the effects of the POE content on the mechanical properties. It was found that the Young's modulus, tensile strength, and tensile elongation at break decreased nonlinearly while the tensile fracture strength varied slightly with increasing the POE weight fraction; the V‐notched and unnotched Izod impact fracture strength increased nonlinearly with an increase of the POE weight fraction; the flexural modulus and strength decreased roughly linearly with increasing the POE weight fraction. Furthermore, the impact fracture surface of the specimens was observed by means of a scanning electronic microscope to discuss the toughening mechanisms. POLYM. COMPOS., 37:539–546, 2016. © 2014 Society of Plastics Engineers     

PP/PP-g-DBM/CaCO3复合材料的力学性能

以马来酸二丁酯接枝聚丙烯(PP-g-DBM)作界面改性剂,制备了聚丙烯(PP)/PP-g-DBM/CaCO_3复合材料。PP-g-DBM提高了复合材料的抗冲击性能和弹性模量。当w(CaCO_3)为30%时效果最佳,悬臂梁缺口冲击强度达到6 kJ/m~2,相对PP提高了20%;界面改性剂较大程度地改善了分散相(CaCO_3)在连续相(PP)中的分散状态。     

Optimization of mechanical properties of PP/Nanoclay/CaCO3 ternary nanocomposite using response surface methodology

Response surface method of experimental design was applied to optimize the mechanical properties of polypropylene (PP)/nanoclay/CaCO₃ hybrid ternary nanocomposite using three different levels of melt flow index (MFI) of PP, nanoclay, and CaCO₃ contents. The samples were prepared by melt mixing in a lab scale corotating twin screw extruder. The main effect of each parameter on the tensile modulus, tensile strength, and impact strength was extensively discussed. The structure of obtained nanocomposite was studied using X‐ray diffraction (XRD), atomic force microscopy (AFM), and scanning electron microscopy (SEM) techniques. Tensile modulus and impact resistance of prepared ternary nanocomposite were correlated to considered parameters using a second‐order polynomial model. Also, the optimum values of studied variables were determined using contour plots. The obtained results show that increasing the nanoclay and CaCO₃ contents improve the tensile modulus up to 45%, whereas the optimum value of impact strength, about 54%, is achieved at low concentrations of nanoclay (2 wt %) and CaCO₃ (8 wt %). © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Phase structure and mechanical properties of PP/EPR/CaCO3 nanocomposites: Effect of particle's size and treatment

Calcium carbonate (CaCO₃) reinforced polypropylene/ethylene propylene rubber (PP/EPR) copolymer composites for automotive use were developed by means of extrusion and injection molding process. Three kinds of CaCO₃ (stearic acid treated and untreated) nanoparticles and microparticles were used as fillers. The influence of stearic acid, particle size, and filler content on the state distribution and morphology were investigated by SEM and rheological measurements. Two different morphologies were observed: EPR and CaCO₃ dispersed in the PP matrix and a core shell structure, depending on the interactions between EPR and CaCO₃. Toughening mechanisms and mechanical properties of the different systems were investigated. Significant improvement in tensile modulus is observed in all composites, depending on filler content. Elongation and notched impact strength were drastically decreased, especially for composites with nano CaCO₃. Better impact properties were obtained with low content of treated particles, showing the importance of filler treatment. POLYM. ENG. SCI., 55:2859–2868, 2015. © 2015 Society of Plastics Engineers     

The synthesis of vaterite and physical properties of PP/CaCO3 composites

Vaterite was synthesized in the emulsion state at 50 ‡C. The mixing method was found to have a significant effect on the shape of vaterite. In order to investigate the effect of CaCO₃ morphology on mechanical property and thermal property of polypropylene, cubic forms of calcite and needle forms of aragonite were also prepared in the emulsion states. When vaterite was used as a filler in the PP/CaCO₃ composites, the crystallization temperature and crystallinity were higher than those with other forms. In addition, the size of spherullite of polypropylene was the finest when vaterite was used. Therefore, the vaterite is considered as a proper nucleating agent for polypropylene.     

PP/POE/CaCO3复合材料的性能研究

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。     

PBH/PP及PBH/CaCO_3/PP共混改性研究

采用自制的负载钛催化剂[TiCl4/MgCl2-Al(i-Bu)3],合成了1-丁烯-1-己烯共聚物(PBH)。用己烯摩尔含量为2%、7%、20%的PBH对PP进行共混,研究了共混物的力学性能;以己烯初始摩尔含量为30%的PBH作为CaCO3的载体,填充PP,并与未采用载体的CaCO3填充体系进行比较。结果表明:随着PBH含量的增加,在共混物拉伸强度、弯曲强度、硬度有一定下降的同时,冲击强度则明显提高,己烯摩尔含量大的PBH增韧改性PP的效果更好;以PBH作为载体的CaCO3,随着其含量的增加,共混物的冲击强度明显增大,而拉伸强度、弯曲强度、硬度却有一定程度的下降。与无PBH载体CaCO3填充PP的规律明显不同。     

PPS/CaCO3复合材料的结晶行为及动态力学研究

采用DSC、DMA等测试手段研究了PPS/CaCO_3复合材料的结晶行为和动态力学性能。通过对冷结晶峰值温度T_(?)、半结晶时间t_(1/2)、结晶焓△H_c等参数的分析,结果表明:CaCO_3的添加阻碍了PPS分子链的运动,导致了体系结晶速率减小,结晶能力下降,且阻碍作用在CaCO_3含量为3%时最为明显。同时,通过DMA测试,表明CaCO_3的添加使PPS的储能模量和损耗模量都有所增加,其中损耗模量也在CaCO_3含量为3%时达到最大。