淀粉基抗静电剂的制备及其在HDPE中的抗静电和力学性能

文章以淀粉为重要原料制备了1种抗静电剂。将其添加在HDPE材料中,研究其在HDPE材料中的抗静电作用。结果表明:当抗静电剂质量分数超过1%,该HDPE复合材料的抗静电性能在1个月后优良;该复合材料的抗静电耐擦拭性能优良;该抗静电剂对HDPE材料的力学性能影响不大。     

抗静电高密度聚乙烯的研究

本文研究了五种不同类型的炭黑和炭黑用量对制备 HDPE 抗静电复合材料各种性能的影响,并就四种表面处理剂和五种高分子改性剂对炭黑/HDPE 复合体系的改善作用作了初步的探讨。结果发现,选择好适宜的炭黑品种是提高抗静电材料的关键因素之一;控制炭黑的加入量可以方便地控制复合材料的抗静电性能;某些高分子改性剂对复合材料的性能有非常显著的改善。     

HDPE吹塑专用料的抗静电改性及其应用

研究了各种不同抗静电剂对高密度聚乙烯(HDPE)吹塑专用料抗静电性能、力学性能及成型加工性能的影响,最终选择了抗静电母料作为HDPE吹塑专用料的抗静电剂.应用测试表明,抗静电母料改性HDPE吹塑专用料的抗静电性能优异且综合性能良好,完全满足某弹药部件的使用要求.     

新型抗静电聚丙烯的研制

研究了乙撑双硬酯酰胺和丙三醇合成甘油乙撑双硬酯酰胺为聚丙烯抗静电剂,同时添加石棉短纤维。结果表明,自制的抗静电剂和石棉短纤维的加入,体系的力学性能基本保持不变,表面电阻率大大降低,得到抗静电性能较好的聚丙烯塑料。     

新烷氧基有机金属化合物型无霜抗静电剂

研究发现:新烷氧基钛酸盐和锆酸盐偶联剂混合物与 LLDJFE、HDPE、ABS及丙烯酸类聚合物相溶,具有抗静电性能,且不受环境湿度的影响。用于提高聚合物材料的导电性并能消散静电荷的常规抗静电荆,可分为     

涤纶短纤维油剂可纺性评价体系的建立与应用

阐述了涤纶短纤维油剂实验室可纺性评价体系的建立方法及其应用。以纤维的表面电阻的大小来评价油剂的抗静电性能;以纤维与金属之间的动摩擦系数来评价油剂的平滑性;用纤维与纤维的静摩擦系数和动摩擦系数之差来评价油剂的集束性。并应用该体系来评价涤纶短纤维油剂的抗静电性、平滑性、集束性等可纺性能,工业应用结果与评价结论相一致,证明了评价体系的有效性。     

功能性超细石墨粘胶短纤维的制备及性能研究

以粘胶短纤维为基体,超细石墨为功能添加剂,采用纺前注射技术制备功能性超细石墨粘胶短纤维,并对该纤维的形态结构、结晶结构、热学性能以及抗静电性能进行测试分析。结果表明:超细石墨粘胶短纤维横截面呈锯齿状,纵向表面有沟槽,超细石墨在纤维中均匀分布;超细石墨与粘胶短纤维基体具有良好的共混性和相容性;与普通粘胶短纤维相比,功能性超细石墨粘胶短纤维具有更好的热稳定性和抗静电性能。     

烷基磷酸酯钾盐在聚苯硫醚短纤维上的应用

根据聚苯硫醚短纤维纺丝和加工工艺对抗静电性和摩擦性能的要求,研究了烷基磷酸酯钾盐的碳链长度、单双酯比例、pH值、纤维含油率、环境湿度对聚苯硫醚短纤维抗静电性和摩擦性能的影响。结果表明,随着烷基碳链长度的增加,烷基磷酸酯钾盐抗静电性下降,平滑性增加;提高烷基磷酸酯钾盐的单/双酯比例、pH值、纤维含油率和环境湿度也有助于改善聚苯硫醚短纤维的抗静电性。     

抗静电阻燃增强PA6材料的漏电起痕性能研究

在阻燃增强尼龙6(PA6)材料体系中,分别考察了三种不同类型抗静电剂对体系抗静电性能和耐漏电起痕性能的影响。结果表明:导电炭黑、离子型和永久型抗静电剂都能显著提高材料的抗静电性能,但离子型抗静电剂受环境影响显著;抗静电剂的加入会大大降低体系的耐漏电起痕性能,通过调整离子型和永久型抗静电剂的含量,可以平衡抗静电和耐漏电起痕两种性能的关系;滑石粉的添加能够有效地提高材料耐漏电起痕性能。     

抗静电HDPE的研究进展

简述了抗静电HDPE的抗静电机理及其应用领域,介绍了抗静电剂的种类和抗静电HDPE的常用制备方法最后分析了抗静电HDPE的未来发展方向和前景,并对抗静电剂的发展提出了建议     

纤维增强PA6/HDPE复合材料的性能

制备不同配比的碳纤维(CF)、玻璃纤维(GF)增强PA6/HDPE复合材料.对其摩擦磨损性能和力学性能进行测试,用显微镜对复合材料拉伸断面进行观察.结果表明:碳纤和玻纤对PA6/HDPE复合材料的摩擦磨损性能和力学性能均有一定的改善作用,其中碳纤质量含量为3％时对PA6/HDPE复合材料力学性能和摩擦磨损性能的改善效果较好,其拉伸强度、弯曲强度及冲击强度比未加纤维的PA6/HDPE分别提高了21.6％、38.8％和40.5％;其100 N和200 N载荷下的磨损量分别为未加纤维的PA6/HDPE的71.5％和75.6％.     

HDPE／石墨／POE复合体系力学性能的研究

研究了石墨的表面处理工艺，粒径以及添加量对HDPE力学性能的影响，加之乙烯－辛烯共聚物（POE）来改善HDPE的力学性能，加工性能和耐环境应力开裂性能，结果表明，钛酸酯偶联剂对石墨表面处理效果较好，石墨粒径对材料力学性能影响较大，当POE加入5％（质量）时，体系表现出较好的综合性能，POE，EVA对改善HDPE耐环境应力开裂性是十分有效的。     

Effect of Coupling Agent Concentration,Fiber Content,and Size on Mechanical Properties of Wood/HDPE Composites

In this study, the influence of coupling agent concentration (0 and 3 wt%), wood fiber content (50, 60, 70, and 80 wt%), and size (40–60, 80–100, and 160–180 mesh) on the mechanical properties of wood/high-density-polyethylene (HDPE) composites (WPCs) was investigated. WPC samples were prepared with poplar wood-flour, HDPE, and polyethylene maleic anhydride copolymer (MAPE) as coupling agent. It was found that the tensile properties and the flexural properties of the composites were improved by the addition of 3 wt% MAPE, and the improved interfacial adhesion was well confirmed by SEM micrographs. It was also observed that the best mechanical properties of wood/HDPE composites can be reached with larger particle size in the range studied, while too-small particle size was adverse for the mechanical properties of wood/HDPE composites. Moreover, the tensile modulus, tensile strength, and flexural strength of WPCs decreased with the increase in fiber content from 50 to 80 wt%; the flexural modulus of WPCs increased with the increase in fiber content from 50 to 70 wt% and then decreased as the fiber content reached 80 wt%. The variances in property performance are helpful for the end-user to choose an appropriate coupling agent (MAPE) concentration, wood fiber content, and particle size based on performance needs and cost considerations.     

Direct fluorination of Twaron fiber and investigation of mechanical thermal and morphological properties of high density polyethylene and Twaron fiber composites

Composites consisting of high density polyethylene (HDPE) reinforced with randomly oriented chopped Twaron fibers (both fluorinated and nonfluorinated) show a significant increase in mechanical and thermal properties. To increase the better fiber matrix adhesion, the Twaron fiber is surface fluorinated using elemental fluorine. The surface of the Twaron fiber becomes very rough and the diameter of Twaron fiber increases from ～ 12 to 14 μm after fluorination. The composites were prepared using solution method to overcome the damage of the fiber. The tensile strength and the Young's modulus increases with increasing fiber content. The tensile strength and modulus of modified fiber (fluorinated Twaron fiber) composites is much higher than nonmodified fiber composites indicating that there is better mechanical interlocking between the modified fiber and the matrix. Thermal properties obtained from DSC and DTA‐TG analysis of the fluorinated fiber composites are also improved. Contact angle measurements, as well as the surface energy measurements, indicate that the composites are more wettable and is maximum for fluorinated fiber composites i.e., surface energy for fluorinated fiber composites is highest. Crystallinity is also higher for fluorinated fiber composites. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008     

Electrical and mechanical properties of expanded graphite‐reinforced high‐density polyethylene

High‐density polyethylene (HDPE) was reinforced with expanded and untreated graphite in a melt‐compounding process. Viscosity increased upon addition of graphite phase, with the expanded graphite (EG) showing more dramatic rise than the untreated graphite (UG) in viscosity. The increase in viscosity was attributed to the increased surface‐to‐volume ratio for the EG filler after acid treatment. Electrical conductivity also increased from that pertaining to an insulator to one characteristic of a semiconductor. The EG system showed a lower percolation threshold for transition in conductivity compared to that in the UG system. DSC results indicated that the fillers acted as a nucleating agent in inducing the crystallization of HDPE in the composites. However, the overall degree of crystallinity and melting temperature of HDPE decreased with the addition of EG and UG. Mechanical properties improved as a function of filler content but the overall enhancement was not impressive. It was conjectured that the filler–matrix interface was not optimized in the melt‐mixing process. However, the role of EG as a reinforcement phase for both electrical and mechanical properties was unambiguously established. The EG composites demonstrated potentially useful attributes for antistatic, barrier, mechanical, electrical, and cost‐effective applications. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91:2781–2788, 2004     

HDPE增韧PP-R(PP-B)/弹性体/石墨复合材料的研究

采用高密度聚乙烯(HDPE)为增韧剂，(乙烯／丙烯／二烯)共聚物(EPDM)、(乙烯／辛烯)共聚物(POE)弹性体为增容剂，石墨为功能性助剂制备了以无规共聚聚丙烯(PP-R)或嵌段共聚聚丙烯(PP-B)为基体的PP-R(PP-B)／HDPE／弹性体／石墨复合材料。研究了HDPE含量、弹性体种类及含量对PP-R(PP-B)复合材料力学性能的影响。结果表明，HDPE含量在20％、EPDM含量为5％时，PP-R(PP-B)复合材料的力学性能优异；POE可以使PP-R复合材料的力学性能达到均衡。     

Morphology and mechanical properties of melt drawn chopped UHMWPE fiber/HDPE blends

Blends of ultrahigh molecular weight polyethylene (UHMWPE) chopped fibers with high density polyethylene (HDPE) were prepared by melt mixing extrusion, followed by melt drawing. The combined effect of composition and flow on the morphology was investigated by microbeam synchrotron X‐ray diffraction and high resolution scanning electron microscopy. Apparently in the drawn blends, the presence of fibers resulted in a higher degree of orientated morphology and—as revealed by differential scanning calorimetry—higher degrees of crystallinity and melting points. Significant improvement of mechanical properties was observed with increase of the fiber volume fraction. These results indicate that the oriented arrays of immiscible UHMWPE domains aligned in the flow direction, joined by fiber‐induced crystallization of the surrounding HDPE matrix, and provide strong reinforcing effect. POLYM. ENG. SCI., 46:807–811, 2006. © 2006 Society of Plastics Engineers     

废橡胶粉/高密度聚乙烯共混物的界面相容性

研究了用改性剂和界面相容剂来强化废橡胶粉与高密度聚乙烯之间界面结合的效果。对废橡胶粉/高密度聚乙烯共混物的热力学性能、动态力学性能及微观结构形态等的研究结果表明,界面相容剂和改性剂的加入增强了共混物的界面相容性,提高了共混物的物理机械性能。     

Mechanical and rheological properties of HDPE/graphite composite with enhanced thermal conductivity

Having been treated with coupling agent and pan‐milling, graphite is incorporated into HDPE to make a HDPE/graphite composite with enhanced thermal conductivity as well as good mechanical properties and processibility. This paper focuses on the study of mechanical properties, thermal stability and rheological behavior of HDPE/graphite composite. The experimental results show that with increase of the graphite content, Young's modulus of HDPE/graphite increases and the elongation at break and impact strength decrease. However, when the graphite content is 35% in HDPE/graphite, the elongation at break and impact strength still remain 22.4% and 85.8J/m. respectively. Also, the yield strength increases with the increase of the graphite content, and reaches the maximum at 55% graphite content, and reduces afterwards. The crystallization temperature and thermal stability of HDPE/graphite increase with the increase of the graphite content. The melt viscosity of the filled HDPE remains almost unchanged, but the shear sensitivity increases, and the temperature sensitivity decreases with the increase of the graphite content. By optimizing the experimental conditions, a HDPE/graphite composite with fairly good comprehensive properties such as enhanced thermal conductivity and stability, good mechanical properties, and processability could be prepared, which has potential application in the field of heat transfer.     

A novel mica‐based composite with hybrid aramid fibers for electrical insulating applications: largely improved mechanical properties and moisture resistance

The fabrication of mica‐based composites with good mechanical properties is very important especially for electrical insulation applications. In this study, a new aramid fibrid along with chopped fibers was introduced into a mica system, and the composites were prepared using a papermaking machine. It was found that the mechanical properties of both fibrid–mica composite (F‐M paper) and fiber/fibrid–mica composite (A‐M paper) were largely improved in comparison with the reference sample (M paper) with an increase in the content of fibrid or hybrid floc/fibrid. This enhancement can be attributed to two mechanisms: (1) enhanced interfacial adhesion derived from the addition of fibrids with good flexibility and wrapping properties and (2) significant reinforcing due to the frameworks originating from the addition of chopped flocs with high modulus and rigid‐rod morphology. Interestingly, a synergetic effect of enhanced interfacial adhesion and reinforcing could also be observed when both flocs and fibrids were introduced, which further improved the mechanical properties. Furthermore, the addition of aramid fibrid greatly enhanced the moisture resistance, which expands the potential for mica‐based composites. Thus, we successfully fabricated a mica‐based composite for electrical insulation with good mechanical properties, high end‐use temperature and excellent moisture resistance by adding hybrid aramid fibers. © 2017 Society of Chemical Industry