Evaluation of Nylon 6 and Nylon 66 Cord Fabrics for Scooter Tyre Production under Different Curing Conditions

Cord fabric is a critical material used in the manufacture of tyres and various composite materials to increase durability and strength. The tyre consists of many layers of cord fabric, with each layer being referred to as a cord ply. These layers are strategically positioned within the tyre’s internal structure, particularly in the tread and sidewall areas, to improve handling, durability and impact resistance. The cord fabric also serves a critical role in maintaining the structural integrity of the tyre, ensuring that it retains its contour and resists deformations under different operating conditions. This study discusses the advantages and disadvantages of using Nylon 6 (NY6) and Nylon 66 (NY66) cord fabrics in scooter tire production, with a focus on their mechanical behavior under varying curing temperatures and pressures. It was observed that while the curing time for both NY6 and NY66 remained consistent across different platen temperatures and pressures, their mechanical properties showed significant differences. NY6, known for its flexibility and impact resistance, exhibited greater changes in cord-breaking strength and elongation with increasing temperature, showing a marked decrease in breaking strength at higher temperatures. In contrast, NY66 maintained better stability and performance under similar conditions.

THE EFFECT OF BLENDING SEQUENCE ON PHASE MORPHOLOGY OF NYLON 6/ABS/SMA BLENDS

The preparation process-dependent phase morphology of blends composed of nylon 6 and acrylonitrile-butadiene- styrene(ABS)over a composition range of 30-70 wt% using a styrene-maleic anhydride(SMA)copolymer as the compatibilizing agent with a constant content(5phr)was investigated.The results of the scanning electron microscope (SEM)observation revealed that compared with the binary blends of nylon 6 and ABS,the existence of SMA caused a composition shift of phase inversion to a higher weight fraction of ny...

Electrospun MgO/Nylon 6 Hybrid Nanofibers for Protective Clothing

Magnesia(MgO) nanoparticles were produced from magnesite ore(MgCO3) using ball mill. The crystalline size, morphology and specific SSA were characterized by X-ray diffraction analysis, transmission electron microscopy and Brunauer-Emmett-Teller method, respectively. MgO nanoparticle-incorporated nylon6 solutions were electrospun to produce nanofiber mats. Surface morphology and internal structure of the prepared hybrid nanofiber mats were examined by scanning electron microscopy and high-resolution transmission electron microscopy, respectively. The fire retardancy and antibacterial activity(Staphylococcus aureus and Escherichia coli) of coated fabrics made from MgO/nylon 6 hybrid nanofiber are better than those from nylon6 nanofiber.

Non-isothermal crystallization kinetics of reactive microgel/nylon 6 blends

The non-isothermal crystallization kinetics of reactive microgel/nylon 6 blends was investigated by differential scanning calorimetry(DSC). The Mo equation was employed to analyze the non-isothermal crystallization data. The crystallization activation energies were also evaluated by the Kissinger method. The results show that the crystallization onset temperature(T onset) and crystallization peak temperature(T p) decrease with the increase of the content of reactive microgel, while ΔT(T onset–T p), the crystallization half-time(t1/2) and the crystallization enthalpy(ΔH c) increase. The required cooling rates of blends are higher than that of neat nylon6 in order to achieve the same relative crystallinity in a unit of time. The crystallization activation energies of the reactive microgel/nylon 6 blends are greater than those of the neat nylon 6. When the content of reactive microgel is 30%, the relative crystallinity(X t) reaches the maximum.

柴油机用GF/Nylon 6冷却风扇破坏的原因及改进措施

介绍了柴油机冷却风扇的结构,生产风扇的材料及大众公司尼龙6性能,分析了环形风扇发生疲劳破坏的原因及主要裂纹起源,提出了改进冷却风扇性能的措施。

Polyurethane Grafted Attapulgite as Novel Fillers for Nylon 6 Nanocomposites

Attapulgite fibers were modified by polyurethane, forming polyurethane grafted attapulgite （AT-PU）, which was confirmed by Fourier transform infrared spectroscopy （FTIR）, X-ray diffraction （XRD） and X-ray photoelectron spectroscopy （XPS）. Nylon 6/AT-PU nanocomposites of different modified attapulgite loadings were prepared by melt blending in a twin screw extruder. Scanning electron microscopy （SEM） observation on the fracture surfaces of the nanocomposites showed not only a uniform dispersion of AT-PU but also a strong interfacial adhesion with the matrix. Differential scanning calorimeter （DSC） and Thermogravimetric analyzer （TGA） were used to illustrate the infiuence of AT-PU particles on the thermal properties of the nylon 6/AT-PU nanocomposites. The results indicated that the addition of attapulgite probably induced the heterogeneous nucleation and was favorable for the formation of γ -crystalline form, and that the higher thermal stability was obtained for the composites.

STUDY ON NYLON 6/SUPERFINE RUBBER PARTICLES COMPOSITES VIA IN SITU POLYMERIZATION

Two highly cross-linked superfine styrene-butadiene rubber particles, one with 1 wt% of carboxyl groups and theother without such groups having particle sizes of 130-150 nm and 80-100 nm respectively, were used to prepare nylon6/rubber composites via in situ polymerization. It was found that carboxylic styrene-butadiene dispersed uniformly in nylonmatrix and there was strong interfacial interaction because of the graft polymer formed by the reaction of nylon with carboxylgroup of the rubber, resulting in considerably improved impact strength with almost unchanged tensile strength. However,the addition of styrene-butadiene without carboxyl groups showed intensive agglomeration of the rubber particles and weakinterfacial interactions, and the toughness of the materials was improved slightly. The crystallization and rheological behavior of the composites were also discussed.

Effects of ABS-g-MAH on the properties of Nylon 6/ABS alloy

The alloy of Nylon 6/acrylonitrile-butadiene-styrene （ABS） was used for a compatibilizer to generate the maleic anhydride （ABS-g-MAH）, in which the proportion of PA6/ABS is 90/10. The results of the mechanical tests show that when the content of ABS-g-MAH is 20 %, the impact strength of the alloy with the compatibilizer increased by around 41%, compared with that of the PA6/ABS alloy; Besides, the tensile strength has been significantly improved. Furthermore, in accordance with the dynamic mechanical analysis, a relaxation temperature of Nylon 6 has raised from 70 ℃ to 110 ℃with the addition of ABS and ABS-g-MAH; moreover, and the obvious relaxations of β and 7 occur at about 60 ℃ and - 60 ℃, respec- tively. It can be seen from the scanning electron microscope （SEM） photographs that the compatibility has been improved through the addition of ABS-g-MAH. The water absorption of Nylon 6 has also been improved by the addition of ABS and ABS-g-MAH. When the content of ABS-g-MAH is 10%, the water absorption of the alloy will fall by 50%.

Morphology and Mechanical Properties of Nylon 6/PBT Blends Compatibilized with Styrene/Maleic Anhydride Copolymer

The mechanical properties and dynamic mechanical properties of blends composed of Nylon 6 and poly （ butylenes terephthalate） （PBT）, with styrene/maleic anhydride（SMA） as compatibilizer, were studied. The observation on the morphologies of the etched surfaces of the cryogenically fractured specimens via scanning electron microscopy（SEM） demonstrated that in the compatibilized Nylon 6/PBT blends, there exists a finer and more uniform dispersion induced by the in-situ interfacial chemical reactions during the preparation than that in the corresponding uncompatibilized blends. On the other hand, the overall mechanical properties of the compatibilized blends could be remarkably im- proved compared with those of the uncompatibilized ones. Moreover, increasing the amount of the compatibilizer SMA leads to a more efficient dispersion of the PBT phase in Nylon 6/PBT blends. Furthermore, there exists an optimum level of SMA added to achieve the maximum mechanical properties. As far as the mechanism of this reactive compatibilization is concerned, the enhanced interfacial adhesion is necessary to obtain improved dispersion, stable phase morphology, and better mechanical properties.

Effect of Cenosphere Concentration on the Mechanical, Thermal, Rheological and Morphological Properties of Nylon 6

Cenospheres are widely used as filler in thermoset plastics and concrete mainly for density reduction of the material. But there is no work noted of using cenosphere as filler in thermoplastics. In this paper cenosphere concentration was varied from 0 to 10 phr of nylon 6 and the effect of the same on the mechanical, thermal, rheological and morphological properties of the composite were studied. Elongation was found to have increased by 83% and impact strength by 44% at 2.5 phr loading of cenosphere. Flexural strength increased upto 25% at 10 phr content of cenosphere.

An antistatic agent based on polyionic liquid applied to nylon 6

In order to improve the electrical conductivity of nylon 6(PA6)and avoid misfires and explosions caused by static charge accumulation,a quaternary ammonium salt polyionic liquid(PIL)antistatic agent was synthesized in this paper.The surface resistance of PA6 was reduced to 10~8Ωwith the addition of 2 wt%antistatic agent,and the mechanical properties and aging resistance of the substrate were improved.Meanwhile,the morphology and crystallinity of PIL/PA6 composites were further characterized by scanning electron microscope(SEM),energy dispersion spectrometer(EDS)and X-ray diffraction(XRD).It is worth noting that the quaternary ammonium salt polyionic liquid antistatic agent synthesized in this paper has the advantages of excellent antistatic effect,durability,low cost,and simple reaction condition,so it has a broad application prospect in the antistatic aspect of PA6.

不同截面类型玻纤增强PA6的性能

对比研究了扁平玻纤及圆形玻纤增强尼龙6 (PA6)复合材料的力学性能、流动性能、收缩翘曲情况、摩擦性能及线膨胀系数(CLTE)。结果表明,随着玻纤含量增加,扁平玻纤及圆形玻纤增强PA6复合材料力学性能均增加,但熔体流动速率(MFR)降低;相同玻纤含量下,与圆形玻纤相比,扁平玻纤增强PA6复合材料的拉伸强度、弯曲强度及弯曲弹性模量较低,简支梁缺口冲击强度及MFR较高。在玻纤含量30%的条件下,不同扁平玻纤及圆形玻纤增强PA6复合材料性能存在差异,通过收缩率测试分析,扁平玻纤复合材料比圆形玻纤具有更低的收缩率及横纵收缩比,扁平比越高,横纵收缩比越低,翘曲度越小;通过MFR及注塑螺旋线测试,发现扁平玻纤复合材料具有更好流动性、更高流长比,扁平比越高优势越明显,有利于成型加工;通过滑动摩擦测试结果看出,扁平玻纤复合材料具有更低摩擦系数,随着扁平比增大,摩擦系数越低;通过热机械分析检测,扁平玻纤复合材料在垂直流动方向CLTE低于圆形玻纤,且流动方向和垂直流动方向CLTE差异也较小。扁平玻纤增强材料能改善传统圆形玻纤增强体系的一些不足,优化产品性能。

Surlyn树脂改性PA6/CaCl_(2)材料的制备及性能

本文通过双螺杆挤出制备了沙林(Surlyn)树脂改性尼龙6(PA6)/CaCl_(2)材料,通过红外光谱(FTIR)、拉曼光谱(Raman)研究了Surlyn树脂改性对复合材料的分子链结构的影响,并通过X射线衍射(XRD)、差示扫描量热仪(DSC)和扫描电镜(SEM)对改性材料的结晶性能和微观结构进行了分析。结果表明,Surlyn树脂能够促使PA6分子链间氢键减弱,但是PA6/CaCl_(2)/Surlyn复合材料的结晶度变化并不明显,改性后复合材料的γ晶型在总结晶度中所占的比例随Surlyn树脂用量的增加而逐渐增大,添加20%质量分数的Surlyn树脂后PA6/CaCl_(2)/Surlyn复合材料结晶度基本不变,但α晶型的比例由38.43%下降至30.52%。加入15%质量分数的Surlyn树脂后PA6/CaCl_(2)/Surlyn复合材料出现了明显的脆-韧转变;添加20%质量分数的Surlyn树脂后复合材料拉伸强度为58.12 MPa,与纯PA6相比复合材料的拉伸强度仅下降10.42%,而断裂伸长率和缺口冲击强度达到152.14%和10.27 kJ/m^(2),分别增加了135.98%和66.72%。

尼龙-6改性纤维素纸结合高效液相色谱技术检测水中7种酚类化合物

以纤维素纸张为基底,在甲酸中通过原位合成法在纤维素纸表面中引入尼龙-6,获得改性纤维素纸,并分析了改性纤维素纸的形貌和结构。利用改性纤维素纸作为固相萃取处理材料富集浓缩水体中的7种酚类化合物,建立了一套改性纤维素纸―高效液相色谱法检测水环境中7种酚类化合物的实验方法,并用于实际样品的检测,结果表明在3种实际样品中7种酚类化合物回收率的范围为59.0%~74.7%,其中检出限(LOD)范围为0.5~4.5 ng/L,定量限(LOQ)范围为6.9%~13.8%,基质效应为96.1%~104.6%,改性纤维素纸在分析与检测领域具有较好的应用前景。

原位聚合法制备连续玻璃纤维增强尼龙6复合材料的改性和性能

尼龙6(PA6)树脂具有优异的性能,其连续纤维复合材料在汽车、航空航天领域具有广泛应用。但是PA6树脂熔融后黏度较高,不易对连续纤维充分浸渍,并且连续纤维与PA6的复合材料界面黏附性较差,限制了其复合材料的性能和应用。针对这些问题,文中对连续玻璃纤维增强尼龙6(CGF/PA6)复合材料开展了研究。首先,采用阴离子开环聚合制备PA6,确定了其最佳制备工艺;其次,用硅烷偶联剂KH550(AP)对连续玻璃纤维(CGF)进行改性,并对其进行了红外光谱表征;最后,通过原位聚合法制备了CGF/PA6复合材料,研究了AP改性对CGF/PA6复合材料力学性能的影响,并对CGF/PA6复合材料的拉伸断口进行了扫描电镜分析。结果表明,AP被键合到了CGF表面,AP改性可以增强CGF/PA6复合材料的界面黏附性,从而使CGF/PA6复合材料的拉伸强度得到改善,当AP用量为2%时,CGF/PA6复合材料的拉伸强度高达88.52 MPa,此时,复合材料的断裂伸长率最低,为4.90%。CGF/PA6复合材料的冲击强度变化不大,均在50 k J/m2左右,说明复合材料的韧性受CGF表面改性影响较小。

玻纤增强尼龙6材料水煮后性能变化

玻纤增强尼龙6材料因其独特的材料特性在使用过程中会吸水,进而会引起性能和尺寸的变化,在实际的使用过程中材料性能是处于一个动态的变化过程的,会对产品造成应用功能的波动。为了更好地掌握此变化规律,进而在使用过程中进行控制,通过研究水煮时间对玻纤增强尼龙6材料吸水率的影响,分析不同吸水率下物理性能和尺寸的变化;再将煮水后的尼龙6复合材料放置在23℃±2℃,相对湿度为50%±5%的标准环境中对其吸水率的变化及物性性能的变化进行研究分析,得出变化规律曲线图。结果表明:玻纤增强尼龙6材料吸水速度和水温存在较大关系,水温越高吸水率越快,吸水后其拉伸强度、弯曲弹性模量等刚性指标下降,冲击强度指标则上升;在23℃±2℃,相对湿度为50%±5%的标准环境放置后随着时间的增加,复合材料的吸水率会趋向一个平衡值,拉伸强度、弯曲弹性模量、冲击强度等指标会有不同程度的变化;最终得出30%玻纤增强尼龙6材料的饱和吸水率在6.67%左右,平衡吸水率值在2.53%左右,在实际应用中可参考此值进行水处理。

POE离聚物的制备及其增韧改性PA6

为解决传统功能单体接枝聚烯烃弹性体(POE)增韧尼龙6 (PA6)后,共混物黏度提高、流动性极大降低的问题,以双叔丁基过氧化异丙基苯为引发剂,采用Zn(OH)_(2)、衣康酸(ITA)、共聚单体苯乙烯与POE熔融共混接枝反应,ITA中的羧基在POE熔融接枝过程中部分或全部中和,一步法制备了不同中和度的POE离聚物。通过傅里叶变换红外光谱对接枝的POE结构进行了表征,结果表明ITA接枝后的POE在1 710 cm^(-1)处出现了羰基基团的特征吸收峰,而Zn(OH)_(2)和POE在1 600~1 800 cm^(-1)处出现一个复合吸收带,对应于羧酸盐的特征吸收峰,证明了成功将离子键引入POE中。使用不同中和度POE离聚物对PA6进行增韧实验,研究了其对PA6/POE共混物力学性能和熔体流动速率的影响。结果表明:离子键的引入不仅提高了PA6/POE共混物合金的相容性,极大地提高了共混物力学性能,还能降低稳定化学键对共混物流动性下降的影响,提高共混物的熔体流动速率。

碳纳米管及石墨烯协同增强尼龙6摩擦学性能的分子动力学模拟

为研究碳纳米管(CNT)和石墨烯片(GNS)协同增强尼龙6(PA6)复合材料摩擦学及力学性能的微观机制,利用分子动力学方法模拟PA6及其复合材料的拉伸过程及摩擦学行为,分析CNT、GNS对PA6复合材料力学及摩擦学性能的影响。建立Fe原子与纯PA6和PA6/CNT、PA6/GNS、PA6/GNS/CNT复合材料组成的摩擦学模型,并对模型进行几何优化、退火及动力学平衡,通过对Fe原子施加0.2 GPa应力及0.01 nm/ps速度进行摩擦模拟。研究结果发现,PA6/GNS/CNT复合材料摩擦因数在所有材料中最低为0.252;相比其他3种材料,PA6/GNS/CNT复合材料的抗剪切性能最好,且弹性模量及剪切模量均有提高。通过对比分析4种材料的径向分布函数、摩擦界面温度、材料总势能揭示了CNT和GNS协同增强PA6摩擦学及力学性能的作用机制,指出加入的CNT/GNS通过范德华及静电力作用降低了PA6与Fe原子摩擦副之间的相互作用,此外一维CNT与二维GNS通过π-π堆叠杂化作用形成了3D杂交堆叠体系,协同增强了PA6的摩擦学性能。

反应挤出在尼龙6聚合与改性中的研究进展

基于反应挤出这一技术,总结了尼龙6(PA6)聚合和改性中的研究进展。首先阐述了在反应挤出中进行PA6聚合的机理、特点、研究进展、性能和优势等,然后详细介绍了反应挤出改性PA6中包括的PA6单体聚合过程中改性和直接利用PA6基体的改性两种类型,概述了利用反应挤出进行PA6共聚、扩链支化和反应共混等改性的研究进展。发现PA6复合材料的性能提升,关键在于有效处理不同组分之间的相容性。在对当前反应挤出PA6复合材料的应用领域进行了全面梳理后,发现简单地提高PA6的力学性能已不能满足日益增长的使用需求。因此,未来的研究方向应当着重于探讨反应挤出过程中的反应机理,开发多种类别的PA6复合材料产品,并深入研究在反应挤出环境下材料性能的表现。

尼龙6与ε-聚赖氨酸复合材料的溶剂法制备及热性质分析

通过控制尼龙6和ε-聚赖氨酸在三氟乙醇和水中的溶解量、三氟乙醇的浓度和混合顺序,以溶剂法实现尼龙6和ε-聚赖氨酸真溶液分散,然后经过旋转蒸发和真空干燥,制备得到不同ε-聚赖氨酸含量的尼龙6系列复合材料。利用热重分析仪和差示扫描量热仪考察商品尼龙6、ε-聚赖氨酸和系列样品的热性质,结果表明:通过溶剂法处理,提纯和重结晶商品尼龙6,尼龙6的结晶温度提高了9℃,熔点提高了7℃;ε-聚赖氨酸的加入影响了尼龙6的规整度,使尼龙6的熔点和结晶温度稍有变化,变化幅度小于3℃,不影响其加工性能。