赤泥填充改性聚丙烯的研究

采用湿法表面处理得到经硬脂酸、铝酸酯偶联剂、钛酸酯偶联剂改性后的赤泥(RM),再用RM对聚丙烯(PP)进行共混改性,研究了表面处理剂种类及RM填充量对PP/RM复合材料的力学性能、结晶与熔融行为及热稳定性的影响。结果表明,当经钛酸酯偶联剂处理的RM填充量为20份时,PP/RM复合材料的综合性能最好,其拉伸强度与缺口冲击强度较纯PP分别提高了15.8%与42.1%。RM具有异相成核作用,提高了PP的结晶温度、熔点与结晶度,并促进β晶型的形成。RM的添加还提高了PP的热稳定性。     

改性勃姆石对聚丙烯性能影响研究

将勃姆石用酞酸酯偶联剂（TC-114）进行活化改性处理,将其与聚丙烯（PP）进行熔融挤出得到PP/改性勃姆石复合材料,采用热重分析仪、差示扫描量热仪、极限氧指数测试仪、锥形量热仪等探究改性后勃姆石对PP性能的影响。结果表明,经过偶联剂处理的勃姆石填充PP后所得的复合材料的弯曲强度与纯PP对比的提高了14.4 %,冲击强度提升了30.6 %,而与未改性勃姆石填充的复合材料比弯曲强度提高了6.9 %,冲击强度提升了5.7 %,且断裂伸长率相较于未改性的复合材料提升4倍;改性勃姆石填充聚丙烯复合材料的熔体流动速率、热稳定性以及极限氧指数相较于纯PP都有较大程度提升;改性后的勃姆石有增强聚丙烯力学性能性能的效果,并且随着填入量的增加,热稳定性和阻燃性能都随之提高。     

多填料改性汽车内饰用聚丙烯

以汽车内饰用聚丙烯为研究对象,通过共混改性研究了硅烷偶联剂、钛酸酯偶联剂、铝酸酯偶联剂及其两两复配形成的三种复合偶联剂对高岭土和硫酸钡进行的表面改性填充聚丙烯的性能。试验表明,钛酸酯偶联剂/铝酸酯偶联剂复配改性高岭土和硫酸钡填充聚丙烯(PP)能取得最优的综合性能,拉伸强度提升10.62%,断裂伸长率提升12.8%,弯曲强度提升4.95%,缺口冲击强度提升28.62%,熔体质量流动速率提升52.48%。通过正交试验对钛酸酯/铝酸酯复合偶联剂改性高岭土和硫酸钡填充PP进行了配方优化,同时发现高岭土能起到增强作用,硫酸钡对基体有增韧作用,且高岭土与硫酸钡在PP中具有协同作用。     

洋麻纤维的表面改性及其在聚丙烯基复合材料中的应用

采用碱处理、偶联剂处理以及碱–偶联剂复合处理对洋麻纤维进行表面改性,然后将其与聚丙烯(PP)纤维复合,采用非织造–模压工艺制备了PP/洋麻纤维复合材料。研究了上述3种表面改性方法对洋麻纤维强度及其复合材料弯曲与剪切性能的影响,并采用扫描电子显微镜(SEM)研究了洋麻纤维表面改性前后的形貌变化及其与PP基体之间的界面结合状况。结果表明,表面改性后洋麻纤维的拉伸强度均降低,但复合材料的弯曲强度及层间剪切强度均提高,表明这3种改性方法均提高了洋麻纤维与PP之间的界面结合强度;碱处理可去除纤维表面的果胶成分,使纤维束变得松散,使复合材料的弯曲强度及层间剪切强度分别较未表面改性时提高了21%和169%,但弯曲弹性模量降低了21%;偶联剂处理则使复合材料的弯曲强度,弯曲弹性模量和层间剪切强度较未表面改性时提高了23%,7%和160%;碱–偶联剂复合处理兼顾了碱处理和偶联剂处理的优点,使复合材料弯曲强度、弯曲弹性模量和层间剪切强度分别较未表面改性时提高了26%,18%和572%,综合性能最佳。SEM结果表明,碱–偶联剂复合处理后,复合材料中纤维与树脂之间的界面结合较好。     

碳酸钙／聚丙烯复合材料的力学性能对比研究

研究了无机刚性材料纳米或微米碳酸钙对聚丙烯(PP)的填充改性以及利用钛酸酯偶联剂对纳米碳酸钙进行表面处理后,对于碳酸钙/聚丙烯复合材料体系的力学性能的影响.结果表明,纳米碳酸钙/聚丙烯复合材料的力学性能明显优于微米碳酸钙/聚丙烯复合材料的力学性能;钛酸酯偶联剂改性处理纳米碳酸钙粒子后,其复合体系的冲击强度和断裂伸长率有明显的提高.     

滑石粉表面改性填充PP复合体系研究

采用钛酸酯、铝酸酯、硼酸酯及硅烷偶联剂,对滑石粉进行表面改性处理,通过接触角、活化率、吸油量和红外谱图等试验方法对改性效果进行了评定;检测滑石粉填充PP复合体系的力学性能,进一步说明了偶联剂种类和填料粒径对复合材料力学性能的影响。结果表明:活化改性后,填料表面的极性和官能团均发生了变化;硅烷和钛酸酯偶联剂改性滑石粉效果较好,1250目滑石粉填充体系的综合力学性能最优。     

PP/硅灰石复合材料力学性能的研究

采用熔融共混法制备了聚丙烯(PP)/硅灰石复合材料,考察了硅灰石表面处理及其用量对PP/硅灰石复合材料力学性能的影响。结果表明:硅灰石粉体经偶联剂甜菜碱(CAB)表面改性处理后,其填充复合材料的拉伸强度、断裂强度和冲击强度均比未处理体系有所提高。随着改性硅灰石用量的增加,PP/硅灰石复合材料的拉伸强度和断裂强度均先升后降,其中当改性硅灰石用量为10 phr时,复合材料的拉伸强度和断裂强度均达到最大值,分别比纯PP提高了17%和63%;另外,当改性硅灰石用量为40 phr时,复合材料的冲击强度达到最大值(2.59 kJ/m2),比纯PP提高了29%。     

柠檬石膏的表面改性对柠檬石膏/聚丙烯复合材料性能的影响

本文研究了单一和混合偶联剂表面改性的柠檬石膏对柠檬石膏/聚丙烯复合材料的力学性能,结晶度,熔点的影响;结果表明:单一偶联剂表面改性的柠檬石膏使柠檬石膏/PP复合材料的拉伸强度,弯曲强度和弯曲模量较PP有不同程度提高,钛酸酯和铝酸酯偶联剂对柠檬石膏的表面改性具有较好效果。混合偶联剂表面改性的柠檬石膏使柠檬石膏/PP复合材料的冲击强度较单一偶联剂表面改性柠檬石膏填充PP的复合材料提高了34.7%,而拉伸强度,弯曲强度和弯曲模量均有一定下降。差示扫描量热(DSC)分析结果显示柠檬石膏的加入可以提高聚丙烯的结晶度,对复合材料的熔点几乎没有影响;柠檬石膏的表面改性对复合材料中PP的结晶度和熔点均没有明显影响。     

硫酸钡/聚丙烯复合材料的力学性能及形态结构

采用铝酸酯和钛酸酯偶联剂对BaSO4进行表面处理,通过熔融共混制备了聚丙烯(PP)/BaSO4复合材料。研究了BaSO4粒径和填充量、偶联剂种类及用量对PP/BaSO4复合材料力学性能、流动性能的影响。结果表明:BaSO4粒径越小,在基体树脂中的分散性越好,复合材料的韧性改善越明显;采用偶联剂处理的BaSO4对PP进行填充改性,可有效提高复合材料的冲击韧性和断裂伸长率,使用铝酸酯偶联剂处理的改性效果明显优于钛酸酯偶联剂;在PP/BaSO4复合材料试样的冲击断面上存在许多粒子抽出后留下的孔穴,而孔穴的形成使复合材料的韧性得到提高。     

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。     

SiO_2对环氧胶粘剂强度的影响

研究了硅烷偶联剂处理的常规尺寸SiO2粉对XH-11结构胶剪切和拉伸强度的影响。并简要分析了经偶联剂处理和未经偶联剂处理两种情况下,填料对胶粘剂力学性能影响的机理。     

一种新型偶联剂的研制与应用

研究了以低分子量聚乙烯为骨架，接枝低碳数脂肪酸而成的一种新型偶联剂，并且与钛酸酯联剂进行性能比较，结果表明，用该研制偶联剂活化处理无机填料填充树脂，可以提高体系的流动性，强度，热变形温度等性能，并且在相同条件下，均优于钛酸酯偶联剂。     

Effect of Coupling Agents on the Performance of PP/MAH-g-PP/CaCO3 Ternary Composites

This study deals with the creation and characterization of a polypropylene/calcium carbonate composite in the presence of maleic anhydride–grafted polypropylene used as a compatibilizer. In order to improve the properties of the interfacial zones, the reinforcing filler was treated with two different coupling agents, which were a silane named Dow Corning Z-6020 and a zirconate coupling agent named Ken-React NZ-44. The performance of the interface within the composites was assessed through the measurement of the mechanical and thermal properties. The results revealed an important enhancement of the impact strength and the heat deflection temperature as a result of surface treatment. The analysis of the relative evolution of those properties showed that a more pronounced reinforcing effect was obtained with the NZ-44 coupling agent. The improvement in the properties seemed to depend particularly on the state of the dispersion of the filler throughout the matrix and on the nature of the interface. The thermogravimetric analysis allowed the conclusion that the filler improved the thermal stability of the material but the coupling agent did not seem to have any influence on this property.     

碳纤维布增强聚苯硫醚复合材料的性能研究

研究碳纤维布的含量、表面处理方法及填料等对聚苯硫醚复合材料性能的影响。结果表明，随着碳纤维布含量的增加，复合材料的拉伸强度、冲击强度提高；碳纤维布经过表面处理后与聚苯硫醚的粘接强度大大提高，其中用丙酮浸泡的效果好于高温热处理；填料硅灰石经偶联处理后加入复合材料中，可提高材料的力学性能和耐热性。     

Effects of silane coupling agent and maleic anhydride‐grafted polypropylene on the morphology and viscoelastic properties of polypropylene–mica composites

In this study, morphology, and dynamic and mechanical properties of polypropylene–mica (PP–Mica) composites were investigated. To enhance the adhesion between PP and mica, maleic anhydride‐grafted PP (MAPP) and treated mica with silane coupling agent were used. MAPP (as a compatibilizer) and silane coupling agent (as a filler surface modifier) caused an interfacial bonding in the mica filled polypropylene composites. The effect of mica content, MAPP, and treated mica with silane coupling agent on the morphological properties were investigated by Scanning Electron Microscopy (SEM). The results showed that with increasing MAPP or silane coupling agent, dispersion of filler and adhesion between PP and filler were improved. Mechanical data showed that with increasing MAPP and mica treated with silane coupling agent, tensile modulus and flextural strength of composites were enhanced. Dynamic rheological behavior of composites was also investigated within the domain of linear viscoelasticity. The rheological observations indicated that the complex viscosity, storage and loss moduli increased, and tan δ decreased with increasing mica content. POLYM. COMPOS. 27:491–496, 2006. © 2006 Society of Plastics Engineers.     

环氧树脂胶粘剂的增韧填充改性

研究增韧剂、填料对环氧树脂胶粘剂剪切强度和冲击强度性能的影响。结果表明，随聚硫橡胶加入量的增加，剪切强度和冲击强度呈先增加然后降低的趋势。加入经偶联剂处理的石英粉，剪切强度和冲击强度都有很大的提高。加入二氧化锰后冲击强度提高约250％。     

脱醇型室温硫化硅橡胶的粘接性能研究

以α,ω-二羟基聚二甲基硅氧烷(107硅橡胶)为基胶,纳米碳酸钙为填料,添加硅烷偶联剂等制得脱醇型单组分室温硫化硅橡胶.研究了纳米碳酸钙、硅烷偶联剂种类和基胶黏度对硅橡胶粘接性能的影响.结果表明,随着纳米碳酸钙平均粒径由60 nm减小到30 nm,硅橡胶的拉伸强度从1.30 MPa上升至1.45 MPa,拉断伸长率从7...     

微晶粉增强中密度聚乙烯的研究

制备了以偶联剂改性的微晶粉填充中密度聚乙烯(MDPE)复合材料,分析了偶联剂种类、不同处理方法及填充量对增强MDPE力学性能的影响,在相同工艺条件下,与滑石粉填充MDPE进行了对比。结果表明：经钛酸酯类偶联剂湿法处理的微晶粉填充MDPE,在其质量分数为10％时．拉伸强度达到33．60MPa．显示出了较为明显的增强效果,且具有比滑石粉填充体系更好的拉伸性能,可作为一种新型增强填料。     

黄麻纤维增强不饱和聚酯树脂初步研究

以油酸为偶联剂,将氢氧化钠-油酸处理后的黄麻纤维布作为填充材料制备了不饱和聚酯复合材料,并对氢氧化钠处理黄麻纤维的适宜浓度、复合材料的拉伸强度、冲击强度、吸水率进行了研究测试。结果表明:氢氧化钠的适宜浓度为20%,黄麻纤维增强不饱和聚酯树脂的冲击强度及拉伸强度最大值分别为12.75 kJ/m2和33.05 MPa,复合材料的最大吸水率为4.07%。经油酸处理的黄麻纤维可有效提高不饱和聚酯复合材料的性能。     

Physical properties of a bisphenol-F epoxy containing a silica filler treated with silane coupling agents

A model epoxy system consisting of a diglycidyl ether of bisphenol-F epoxy resin, 1,4-butanediol, and cured with 4-methyl-2-phenylimidazole has been investigated. Thermal analysis indicated that 3 parts per hundred resin (phr) is the optimum amount of curing agent for this system. The influence of silane-treated amorphous fumed silica fillers on properties of the cured epoxy was also examined. Silica particles were treated with 3-aminopropyldiethoxymethylsilane (APDS) and3-aminopropyltriethoxysilane (APTS) coupling agents. No change in glass transition temperatures was observed with the addition of the filler (with or without coupling agents) to the epoxy. Addition of the filler led to a slight increase in the activation energy for the glass transition; however, no change in activation energy was observed when using the coupling agent. Addition of either coupling agent to the filler surface led to an increase in cooperativity. Fumed silica also did not significantly affect moisture diffusion properties, but a small decrease was observed in the moisture saturation mass with the addition of silica particles treated with APDS.