聚酯/SiO_2复合材料及其结晶性能研究

采用原位聚合技术,制备了添加微米、纳米二氧化硅(SiO2)的对苯二甲酸乙二醇酯(PET)复合材料。重点分析了微米、纳米SiO2无机颗粒在PET基体中的分散行为,并探究PET/SiO2复合材料的结晶行为与光学性能。结果表明:原位聚合使得微米、纳米SiO2颗粒以较好的单分散形态均匀分布在聚合物基体中;微米、纳米SiO2颗粒复配虽能促进PET的结晶,但相互之间不能产生协同作用;微米SiO2颗粒会严重影响PET复合材料的光学性能,而一定含量的纳米SiO2颗粒则会显著提高PET复合材料的光学性能。     

纳米二氧化硅阻燃环氧树脂研究

采用硅烷偶联剂对纳米二氧化硅(SiO2)进行表面改性,制备有机改性纳米二氧化硅(O-SiO2),并与环氧树脂(EP)合成EP/O-SiO2纳米复合材料。利用TG、UL-94垂直燃烧测试和锥形量热测试(CCT)等对EP复合材料的力学性能和阻燃性能进行研究。结果表明:一定量的O-SiO2可以提高复合材料的弹性模量,O-SiO2的添加量为10%时,复合材料的弹性模量最大;O-SiO2的加入可以改善EP的阻燃性能,添加量为20%时,复合材料的阻燃效果最好。     

纳米蒙脱土/丁苯橡胶复合材料结构及动态力学性能的研究

利用熔体插层法制备了纳米蒙脱土（PS插层）／丁苯橡胶复合材料，通过基本性能测试XRD测试、DMA测试和DSC测试对材料进行了结构的表征和纳米蒙脱土填充量不同时，复合材料的动态力学性能的变化，结果表明：蒙脱土在基体材料中实现了纳米级分散，并且当填充5份纳米蒙脱土时，复合材料具有较好的动态力学性能。     

聚氨酯/无机纳米粒子复合材料的改性研究

将纳米二氧化硅经预分散后加入聚氨酯反应体系进行原位聚合,结果表明复合材料的力学性能有大的提高。TEM图像显示纳米二氧化硅在PU中有很好的分散,DTA分析证实了纳米二氧化硅的诱导结晶作用是聚氨酯复合材料增强的主要原因。     

PET/纳米凹凸棒母料复合材料性能与结构研究

制备了纳米凹凸棒母料(NAMB),并将其与聚对苯二甲酸乙二酯(PET)共混,利用X射线衍射仪、扫描电子显微镜研究了PET/NAMB复合材料的微观结构,并测试了其力学性能。结果表明,NAMB均匀分散在PET基体中呈"海-岛"结构,它的加入较大程度地提高了复合材料的缺口冲击强度,而对拉伸强度影响不大;同时提高了复合材料的结晶度。     

氧化石墨烯/聚对苯二甲酸乙二醇酯纳米复合材料的制备及其性能

以聚对苯二甲酸乙二醇酯(PET)为基材,添加不同含量的氧化石墨烯(GO),采用熔融共混的方法制备纳米复合材料,并对其性能进行测试.结果表明,随着GO含量的增加,GO/PET纳米复合材料熔体流动性能、导电性能和耐弯曲性能逐渐增加;拉伸强度和断裂伸长率降低;冲击强度先增大后减小.为解决由GO导致的GO/PET纳米复合材料拉...     

PET/SiO2纳米复合材料的燃烧性能研究

采用溶胶-凝胶(Sol-Gel)法制备了PET/SiO_2纳米复合材料。用基于耗氧原理的锥形量热仪,测试并分析PET/SiO_2纳米复合材料的阻燃性能。结果表明,PET/SiO_2纳米复合材料的热释放速率及其峰值、总释热量与纯PET相比均明显降低。     

PET/nano-MgO复合材料的性能研究

通过熔融共混法制备了聚对苯二甲酸乙二醇酯（PET）/纳米氧化镁（nano-MgO）复合材料,对该复合材料的力学性能进行了测试,并用扫描电子显微镜对nano-MgO在复合材料中的分散情况进行了观测。通过差示扫描量热法研究了复合材料的结晶性能,通过热重分析研究了复合材料的热稳定性,通过紫外可见光谱研究了复合材料的紫外屏蔽性能。结果表明,nano-MgO含量为1 %时复合材料的缺口冲击强度比纯PET高15 %,nano-MgO含量为2 %时复合材料的拉伸强度比纯PET高8 %;nano MgO在复合材料中分散均匀;nano-MgO含量为2 %时复合材料的结晶半峰宽为7.7 ℃,比纯PET低15 %;nano-MgO含量为2 %时复合材料的熔点为252.4 ℃,比纯PET高4.1 ℃;nano MgO含量为3 %时复合材料屏蔽紫外线的截止波长为300 nm,比纯PET高11 %。     

交联对聚乳酸/淀粉/纳米二氧化硅复合材料力学性能的影响

采用熔融共混方法制备聚乳酸/淀粉/纳米二氧化硅复合材料,研究了交联对聚乳酸/淀粉/纳米二氧化硅复合材料力学性能的影响,并且采用扫描电子显微镜(SEM)对复合材料的微观形貌进行分析,结果表明:交联能提升淀粉/聚乳酸的界面相容性,并能提高其力学性能,聚乳酸/淀粉/纳米二氧化硅的重量比例为70/20/10时,引发剂及交联剂添加量分别为0.1 phr及0.3 phr时,复合材料的拉伸强度及断裂伸长率分别提高为21.49 MPa及216.74%。     

固相剪切碾磨法制备共聚聚丙烯/纳米二氧化硅复合材料的界面性能

利用固相剪切碾磨方法在常温制备共聚聚丙烯(co-PP)/纳米二氧化硅(SiO2)复合材料,利用SEM、DSC、TGA及力学性能测试等方法研究了未经表面处理的纳米二氧化硅与共聚聚丙烯的界面相互作用.48 h十氢萘抽提实验结果表明:采用固相剪切碾磨方法制备的复合材料中co-PP与SiO2之间存在强烈的相互作用,其力学性能比co-PP及传统直接共混法制备的复合材料高,在SiO2质量含量为5%时其拉伸强度提高11%,缺口冲击强度提高21%.     

UFPCSBR/n-SiO_2纳米粉末材料改性NR/SBR复合材料性能的研究

研究了超细全硫化羧基丁苯橡胶/纳米二氧化硅(UFPCSBR/n-SiO2)纳米复合粉末材料的表面形貌及其对NR/SBR复合材料硫化特性和力学性能的影响。结果表明,UFPCSBR颗粒和n-SiO2颗粒在纳米复合粉末材料中分散良好;加入14份纳米复合粉末材料(UFPCSBR/n-SiO2质量比为3/4)赋予了NR/SBR复合材料较好焦烧安全性,可显著改善100%定伸应力和300%定伸应力,并且拉伸强度、撕裂强度和拉断伸长率均稍有提高。     

Study on performance characteristics of fused deposition modeling 3D-printed composites by blending and lamination

Component contacting degree in a composite material is an important reference for evaluation the performance characteristics. In this article, two composite material systems involving polylactic acid (PLA) with acrylonitrile butadiene styrene (ABS) and PLA with thermoplastic polyurethane (TPU) were prepared by blending and laminating through fused deposition modeling (FDM) 3D printing technology. The mechanical and thermal properties of the as-prepared composite materials were examined. The results indicated that PLA and TPU played a dominant role in tensile strength and breaking elongation, respectively, in individual composite material. ABS and TPU changed the glass transition peek, crystallinity, and modulus of PLA. The results also suggested that although the processing design of the blending method was more suitable for the contact between two components, but the mechanical properties of laminated composites were closer to theoretical predictions. The structural design and processing technology provide a comparative method and reference basis for studying the performance characteristics of composite materials.     

PP-木粉复合材料的加工性能研究

通过对PP-木粉复合材料原料的不同配方进行试验,制出各种不同加工条件下的复合材料。试验结果表明：随着木粉含量的增加,复合材料的冲击强度和拉伸强度均降低,而弯曲强度则升高;同比例的PP与木粉在不同的工艺条件下生产出复合材料的产品质量和力学性能不同,加工工艺条件对产品质量有着较明显的影响,为了保证塑化均匀,外观质量及提高复合材料的综合性能,宜取适中的加工条件。     

Thermal processability and properties of highly filled poly(vinyl alcohol)/talc composite

Abstract

A highly filled PVA/talc composite was prepared through our invented thermal processing technology without using any coupling agent or compatibiliser. The results showed that compared with neat PVA, the melt temperature of the composite decreased and the degradation temperature increased, providing a big temperature window for thermal processing of PVA/talc composite. The composite melt exhibited shear thinning behaviour while its viscosity increased with increasing talc, still satisfied the requirement of thermal processing. The morphology analysis confirmed that talc was well dispersed in PVA, improving heat deflection temperature (HDT), tensile strength and modulus of PVA. When talc was 50 wt-%, the HDT, tensile strength and modulus of the composite were 115°C, 48 MPa, 1·23 GPa respectively, increased by 92, 16 and 150%, compared with PVA, and the elongation at break was 100% of the composite, confirming that the high filled PVA/talc composite was a novel PVA based material with excellent thermal and mechanical properties.     

Evaluating the mechanical performance of supercritical CO2 fabricated polymide 6,6/PMMA,fiber reinforced composites

Recent advancements in SC CO₂ mediated synthesis and material processing have led to polymer‐polymer blends and composite materials with complex morphologies, exhibiting long‐range order and orientation on multiple length‐scales from the nanometer to the centimeter scale. The material under consideration in this work is a polyamide 6,6 (nylon)/poly (methyl methacrylate) (PMMA) fiber‐reinforced composite that was fabricated in a unique SC CO₂ assisted process. The tensile and flexural properties of these unique composites are studied and the evolution of damage and energy dissipation are monitored through cyclic loading and microscopic analysis of post‐stressed composite cross sections. It is shown that this morphology leads to improved flexural modulus and increased ultimate strength with only a small decrease in tensile modulus. These composites also exhibited significant improvements in stress distribution and load transfer without the use of fiber sizing agents for fiber/matrix compatibilization.     

高强全聚丙烯复合板材的制备与性能研究

采用复合挤出与口模拉伸技术制备了共聚聚丙烯(coPP)/等规聚丙烯(iPP)自增强线材,以此为增强体、coPP为基体,经热压成型制备高强全聚丙烯复合板材,并考察其力学性能、动态力学性能、可回收性.结果表明,复合板材的拉伸强度和弯曲强度分别可达160 MPa和63 MPa;增强体的加入使板材的储能模量大幅度提高、损耗因子...     

聚氯乙烯/赤泥复合材料的制备与性能研究

制备了聚氯乙烯(PVC)/赤泥复合材料,研究了赤泥的不同表面处理方式对共混物的力学性能和耐温性能的影响。结果表明:湿法处理赤泥的效果最好,不做处理的效果最差;赤泥的含量在15份时,共混物的缺口冲击强度和拉伸强度最大;添加赤泥可以提高PVC材料的弯曲强度和弯曲模量,同时,耐温性能也有一定程度的提高。     

镍-二氧化硅纳米复合镀层表面分形维数与显微硬度的关系

利用电沉积方法在45钢上制得Ni-SiO2纳米复合镀层,研究了镀液中纳米SiO2的浓度对镀层表面形貌和性能的影响;用投影覆盖法计算镀层表面分形维数,并考察分形维数与镀层显微硬度的关系.结果表明,纳米SiO2的质量浓度为5g/L时,镀层的显微硬度最高;镀层的表面分形维数介于2.7～2.9之间,相关系数在0.9以上,分形维...     

芳纶Ⅲ单向复合材料制备及性能研究

用湿法缠绕法制备了芳纶Ⅲ-环氧树脂单向复合材料,对其拉伸性能、压缩性能、弯曲性能及层间剪切性能进行了研究,并对比了Kelvar-49、芳纶1414单向复合材料的相关性能。试验结果表明:含有杂环结构的芳纶Ⅲ不仅基本力学性能较优,其单向复合材料的拉伸性能、压缩性能、层间剪切性能都优于不含有杂环结构的Kelvar-49和芳纶1414,尤其体现在拉伸性能上。     

Mechanical properties of graphene nanoplatelet/epoxy composites

Because of their high‐specific stiffness, carbon‐filled epoxy composites can be used in structural components in fixed‐wing aircraft. Graphene nanoplatelets (GNPs) are short stacks of individual layers of graphite that are a newly developed, lower cost material that often increases the composite tensile modulus. In this work, researchers fabricated neat epoxy (EPON 862 with Curing Agent W) and 1–6 wt % GNP in epoxy composites. The cure cycle used for this aerospace epoxy resin was 2 h at 121°C followed by 2 h at 177°C. These materials were tested for tensile properties using typical macroscopic measurements. Nanoindentation was also used to determine modulus and creep compliance. These macroscopic results showed that the tensile modulus increased from 2.72 GPa for the neat epoxy to 3.36 GPa for 6 wt % (3.7 vol %) GNP in epoxy composite. The modulus results from nanoindentation followed this same trend. For loadings from 10 to 45 mN, the creep compliance for the neat epoxy and GNP/epoxy composites was similar. The GNP aspect ratio in the composite samples was confirmed to be similar to that of the as‐received material by using the percolation threshold measured from electrical resistivity measurements. Using this GNP aspect ratio, the two‐dimensional randomly oriented filler Halpin–Tsai model adjusted for platelet filler shape predicts the tensile modulus well for the GNP/epoxy composites. Per the authors' knowledge, mechanical properties and modeling for this GNP/epoxy system have never been reported in the open literature. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013