PA66/TLCP/HNTs纳米管复合材料的制备与性能

采用熔融共混方法制备了尼龙(PA)66/热致液晶聚合物(TLCP)/埃洛石纳米管(HNTs)复合材料,研究了其热性能、微观形态及力学性能.结果表明,当TLCP的质量分数为4%、HNTs的质量分数为15%时,复合材料的综合性能最佳.其拉伸强度、拉伸弹性模量、弯曲强度及弯曲弹性模量相比纯PA66分别提高了30.4%、76.9%、34.4%、91.7%.熔体的加工流动性得到改善,PA66/TLCP/HNTs复合材料的吸水性能明显降低.少量的TLCP有利于提高PA66/TLCP复合材料的结晶性能和熔融温度;HNTs的加入能提高复合材料的结晶温度,与基体有较好的界面结合;TLCP及HNTs能在基体中均匀地分散,TLCP在PA66/TLCP/HNTs复合材料中形成微纤结构,且沿纤维轴方向取向.     

热致性液晶/埃洛石纳米管/尼龙66导热原位混杂复合材料的结构与性能

采用熔融共混方法制备了热致液晶聚合物(TLCP)/埃洛石纳米管(HNTs)/尼龙66(PA66)原位混杂复合材料,研究了其导热性能、力学性能及微观形态。结果表明:在实验范围内,复合材料的导热性能及力学性能均随着HNTs含量的增加而提高,当HNTs质量分数增至40%时,复合材料的导热系数、热变形温度、拉伸强度、弯曲强度及弯曲模量分别提高了134%、144%、15.3%、31.9%、231%;扫描电子显微镜(SEM)显示,TLCP及HNTs均能在基体中均匀分散,并能观察到TCLP所形成的沿纤维轴方向取向的微纤及HNTs所形成的导热网链。     

PPS/PA66/HNTs复合材料的制备与性能研究

采用熔融共混方法制备了聚苯硫醚(PPS)/尼龙-66(PA66)/埃洛石纳米管(HNTs)复合材料,研究了其力学性能、热性能及其微观形态.结果表明:当PPS/PA66的比为60/40、HNTs的含量为30%时,复合材料具有较好的性能.复合材料的拉伸强度、弯曲模量及缺口抗冲击强度相对纯PPS分别提高了36.6%、163....     

埃洛石纳米管对尼龙6/碳纤维复合材料物理性能的影响

通过熔融共混方法成功制备了尼龙-6(PA6)/埃洛石纳米管(HNTs)二元复合材料和PA6/碳纤维(CF)/HNTs三元复合材料,并研究了HNTs对PA6力学性能及热性能的影响,以及HNTs和CF协同增韧增强PA6的效果。结果表明,HNTs的加入能够显著提高PA6的刚性和韧性,在质量分数10%的添加量下,可将PA6冲击强度提高56.4%,弯曲模量提高50%。另外,HNTs能够有效诱导PA6结晶形态从α晶型向γ晶型转变,降低了结晶度,有利于降低材料的成型收缩率。同时,HNTs和CF在增韧增强PA6方面显示出了良好的协同作用。     

HNTs原位混杂复合材料的导热机理及自阻燃性能分析

采用熔融共混法制备了聚酰胺66(PA66)/热致液晶聚合物(TLCP)/埃洛石纳米管(HNTs)原位混杂复合材料,研究了其导热机理、阻燃性能及微观形态。结果表明,复合材料的热导率及极限氧指数均随HNTs含量的增加而提高,且HNTs形成导热网链的临界值为30%(质量分数,下同);当HNTs含量为40%时,复合材料的热扩散系数、热导率、极限氧指数分别提高了27%、134%和42%;扫描电子显微镜显示,TLCP及HNTs均能在基体中均匀分散,并能观察到TCLP所形成的沿纤维轴方向取向的微纤及HNTs所形成的导热网链。     

PVC/MBS/埃洛石纳米管复合材料的制备及其性能

采用熔融共混法制备了聚氯乙烯(PVC)/甲基丙烯酸甲酯-丁二烯-苯乙烯共聚物(MBS)/埃洛石纳米管(HNTs)三元复合材料,研究了HNTs对PVC/MBS共混体系力学性能、热性能和微观结构的影响。结果表明:HNTs与MBS可协同增韧PVC,使复合材料的强度和刚性得到改善,当HNTs的填充量为3 phr时,PVC/MBS(100/3)共混体系的冲击强度、拉伸强度、弯曲强度和弯曲模量分别提高了57.7%、12.1%、7.6%和45.9%;其冲击断面呈现韧性断裂特征;TEM观察结果发现,HNTs在PVC/MBS共混体系中具有良好的分散状态;热失重分析显示,HNTs对PVC/MBS共混体系热稳定性的提高能起到一定作用。     

PBT/埃洛石纳米管复合材料的结构与性能

采用熔融共混的方法,制备了聚对苯二甲酸丁二醇酯(PBT)/埃洛石纳米管(HNTs)复合材料,并对PBT/HNTs复合材料的结构与性能进行了研究.结果表明,随着HNTs用量的增加,复合材料的拉伸性能、弯曲性能和维卡软化温度明显提高,但是缺13冲击强度有所降低.动态力学性能分析表明:HNTs的加入使得复合材料的储能模量上升,力学损耗降低.差示扫描量热分析表明:HNTs的加入提高了体系的结晶温度.扫描电镜结果显示:HNTs能够以纳米尺度均匀地分散于PBT基体中.     

埃洛石纳米管对聚酰胺66/热致液晶原位复合材料性能及微观形态的影响

采用熔融共混方法制备了埃洛石纳米管（HNTs）／聚酰胺66（PA66）／热致液晶聚合物（TLCP）原位混杂复合材料,研究了其结晶性能、动态力学性能及微观形态,并提出了相对结晶度的概念。差示扫描量热法分析（DSC）表明：HNTs能促进PA66的结晶并提高晶体的完善程度;随着HNTs含量的增加,体系的相对结晶度逐渐提高;动态力学性能分析（DMA）表明：复合材料的储能模量及损耗模量均随着HNTs含量的增加而显著升高当HNTs含量为40 ％（质量分数,下同）时,复合材料的储能模量及损耗模量分别提高了188％、190 ％;扫描电子显微镜（SEM）显示,TLCP及HNTs均能在基体中均匀分散,且TCLP能较好地沿纤维轴方向取向、成纤。     

PA66/TLCP共混物的结晶行为及力学性能研究

采用直接注塑法制备了聚酰胺66(PA66)/热致聚酰胺液晶(TLCP)复合材料,研究了共混物的结晶行为、晶体形貌和力学性能.DSC研究表明,PA66和TLCP有较好的相容性,随着TLCP含量的增加,PA66的结晶度、结晶速率下降.偏光显微照片显示,在PA66中加入TLCP后,PA66的球晶明显增大,晶界模糊,成为不规则的多面体.红外光谱分析表明,TLCP和PA66分子间存在着较强的相互作用,形成了大量的氢键.力学性能分析表明,当加入质量含量5%的TLCP时,PA66的拉伸强度、拉伸模量增幅最大,分别达25.4%、26.3%,当TLCP的质量含量小于5%时,PA66和TLCP分子间相容性较好,形成大量的分子间氢键,从而提高了力学性能;当TLCP的质量含量大于5%时,TLCP分子间形成了互锁的氢键,影响了共混材料力学性能的进一步提高.     

TLCP/PA66复合材料的熔融和结晶行为

双螺杆挤出制备热致液晶/尼龙 66(TLCP/PA66)复合材料,示差量热扫描(DSC)和X射线衍射(XRD)对复合材料的熔融和结晶等行为进行分析.结果表明:低含量的TLCP存在成核剂的作用使复合材料具有较高的结晶温度、结晶度以及完美的结晶形态;受到TLCP刚性分子链的影响,高含量TLCP使复合材料的熔点、结晶温度和结晶度等参数下降.XRD分析结果表明:TLCP促进复合材料晶体沿(010)和(110)面生长.     

PA6/TLCP/POE-g-MAH原位复合材料的制备与性能

尼龙6(PA6)虽有很多优良的性能,但由于它具有强极性的特点,使其吸水率高,尺寸稳定性和电性能差.同时,由于PA6材料在干态和低温下脆性大、冲击强度差,导致材料使用寿命缩短,这些缺陷都极大地限制了它的应用.本研究采用液晶聚合物(TLCP)对PA6进行改性,使其在加工过程中形成原位复合材料,同时为了改善液晶聚合物与PA6...     

PA66／TLCP原位复合材料的热性能、形貌及力学性能研究

通过挤出和注射成型制备了聚酰胺66／热致液晶聚酰胺（PA66／FLCP）原位复合材料，研究了其热性能、形貌及力学性能。DSC分析表明，PA66和TLCP相容性较好，随着TLCP含量的增加，PA66的结晶度、结晶速率下降；SEM分析表明，TLCP在PA66基体中分散均匀，两相相容性较好，当加入10％（质量分数，下同）的TLCP时，TLCP形成长径比比较大的纤维；拉伸试验结果表明，当加入TLCP后，PA66的力学性能有明显的改善。当加入10％的TLCP时，共混物的力学性能增幅最大，拉伸强度增加79．6％，拉伸模量增加120．4％，断裂伸长率明显下降。     

PPS/E-MA-GMA/GF/HNTs混杂复合材料的制备与研究

采用熔融共混法制备了聚苯硫醚(PPS)／乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯(E-MA-GMA)／玻璃纤维(GF)/埃洛石纳米管(HNTs)混杂复合材料,研究了其力学性能、热性能、阻燃性能及其微观形态.结果表明,当E-MA-GMA在PPS/E-MA-GMA共混体系中的质量分数为12％、GF的质量分数为30％、HNTs...     

Short glass fiber reinforced ABS and ABS/PA6 composites: Processing and characterization

In this study acrylonitrile‐butadiene‐styrene (ABS) terpolymer was reinforced with 3‐aminopropyltrimethoxysilane (APS)‐treated short glass fibers (SGFs). The effects of SGF concentration and extrusion process conditions, such as the screw speed and barrel temperature profile, on the mechanical properties of the composites were examined. Increasing the SGF concentration in the ABS matrix from 10 wt% to 30 wt% resulted in improved tensile strength, tensile modulus and flexural modulus, but drastically lowered the strain‐at‐break and the impact strength. The average fiber length decreased when the concentration of glass fibers increased. The increase in screw speed decreased the average fiber length, and therefore the tensile strength, tensile modulus, flexural modulus, and impact strength were affected negatively and the strain‐at‐break was affected positively. The increase in extrusion temperature decreased the fiber length degradation, and therefore the tensile strength, tensile modulus, flexural modulus, and impact strength increased. At higher temperatures the ABS matrix degraded and the mechanical strength of the composites decreased. To obtain a strong interaction at the interface, polyamide‐6 (PA6) at varying concentrations was introduced into the ABS/30 wt% SGF composite. The incorporation and increasing amount of PA6 in the composites broadened the fiber length distribution (FLD) owing to the low melt viscosity of PA6. Tensile strength, tensile modulus, flexural modulus, and impact strength values increased with an increase in the PA6 content of the ABS/PA6/SGF systems due to the improved adhesion at the interface, which was confirmed by the ratio of tensile strength to flexural strength as an adhesion parameter. These results were also supported by scanning electron micrographs of the ABS/PA6/SGF composites, which exhibited an improved adhesion between the SGFs and the ABS/PA6 matrix. POLYM. COMPOS. 26:745–755, 2005. © 2005 Society of Plastics Engineers     

Microstructural,mechanical, and thermal characteristics of recycled cellulose fiber‐halloysite‐epoxy hybrid nanocomposites

Epoxy hybrid‐nanocomposites reinforced with recycled cellulose fibers (RCF) and halloysite nanotubes (HNTs) have been fabricated and investigated. The dispersion of HNTs was studied by synchrotron radiation diffraction (SRD) and transmission electron microscopy (TEM). The influences of RCF/HNTs dispersion on the mechanical properties and thermal properties of these composites have been characterized in terms of flexural strength, flexural modulus, fracture toughness, impact toughness, impact strength, and thermogravimetric analysis. The fracture surface morphology and toughness mechanisms were investigated by SEM. Results indicated that mechanical properties increased because of the addition of HNTs into the epoxy matrix. Flexural strength, flexural modulus, fracture toughness, and impact toughness increased by 20.8, 72.8, 56.5, and 25.0%, respectively, at 1 wt% HNTs load. The presence of RCF dramatically enhanced flexural strength, fracture toughness, impact strength, and impact toughness of the composites by 160%, 350%, 444%, and 263%, respectively. However, adding HNTs to RCF/epoxy showed only slight enhancements in flexural strength and fracture toughness. The inclusion of 5 wt% HNTs into RCF/epoxy ecocomposites increased the impact toughness by 27.6%. The presence of either HNTs or RCF accelerated the thermal degradation of neat epoxy. However, at high temperature, samples reinforced with RCF and HNTs displayed better thermal stability with increased char residue than neat resin. POLYM. COMPOS. 2012. © 2012 Society of Plastics Engineers