尼龙6/环氧树脂共混物流变性能的研究

用毛细管流变仪研究了尼龙6／环氧树脂共混物的流变性能。结果表明,在实验范围内共混物熔体为假塑性流体;随着环氧树脂用量的增加,表观粘度（ηa）增大,非牛顿指数（n）减小,熔体稠度（K）增大,粘流活化能降低。     

环氧树脂对PA6/EPDM-g-MAH共混体系性能的影响

将两种不同型号的环氧树脂（EP(903)、EP(619D)）分别与PA6/EPDM-MA体系进行共混,制备了PA6/EPDM-MA/EP三元共混物。通过力学测试、动态流变(DMA)、差示扫描量热法（DSC）研究了不同EP添加量和环氧当量对PA6/EPDM-MA/EP共混体系性能的影响。实验结果表明：添加EP可以提高PA6/EPDM-MA共混物的拉伸强度,缺口冲击强度,并随着EP含量的增加而增加;而PA6/EPDM-MA/EP三元共混体系的动态储能模量（G′）,复合黏度（η*）随着EP含量的增加而增大,损耗因子（tanδ）减小;结晶度比未加环氧的共混物的结晶度稍高,并且随着环氧含量增加先增加后降低。此外,添加EP(903)的共混物各种性能变化比EP(619D)快。     

Cathodic Delamination of an Epoxy/Polyamide Coating from Steel

X-ray photoelectron spectroscopy (XPS) has been used to determine the mechanism responsible for debonding of an epoxy/polyamide coating from steel during cathodic delamination in 3.5% aqueous NaCl solutions. Coating failure always occurred near the interface between the coating and the oxide. The nitrogen content of the free surface of the prepared coatings was about 10%. However, the nitrogen content of the free surface dropped to only 5% after exposure to 1 N NaOH for four weeks and that of the coating failure surface after cathodic delamination was only about 2%, implying that the failure involved degradation of the polyamide curing agent by hydroxide ions formed at the steel surface by reduction of oxygen. That conclusion was supported by results obtained from curve fitting of C(1s) and O(1s) spectra. The intensity of components in the C(1s) spectra due to C—N and C≡O bonds in amide functional groups decreased significantly after coatings were exposed to NaOH or subjected to cathodic delamination. Small amounts of organic materials characteristic of the coating were observed on the substrate failure surface, perhaps indicating that the failure was cohesive within the coating but very close to the interface or that some products from degradation of the curing agent precipitated on the substrate. Use of silane coupling agents to retard cathodic delamination was also investigated. Coupling agents were added directly to the coating or applied to the substrate as a primer before application of the coating. Significant reduction in the rate of cathodic delamination was seen only when the silane coupling agent was applied to the substrate and cured at elevated temperatures before the epoxy/polyamide coating was applied.     

Research Advancement in High-Performance Polyamides and Polyamide Blends Loaded with Layered Silicate

Polyamide comprises one of the major classes of polymers. Layered silicates (nanofiller) may enhance properties of polyamide-based hybrids even at very low content. Aliphatic polyamides (nylons) have often been chosen for commercial applications because of excellent physical and chemical properties. Aromatic polyamides (aramids) and aliphatic-aromatic polyamides have been predominantly useful as high-performance materials due to stiffness, low density, and low cost. Recently polyamide blends have become an important route to high-performance materials. Binary blends of polyamide/polypropylene, polyamide/polystyrene, polyamide/polymethyl methacrylate, polyamide/polyurethane, and others have been reported for nanocomposite formation with organoclay. However, ternary blend nanocomposite with nanoclays (PA6/mSEBS, PA6/EPDM-g-MA/H-HDPE) is rarely explored.     

环氧树脂/水滑石纳米复合材料的研究进展

介绍了水滑石的结构、性能、制备方法及环氧树脂/水滑石纳米复合材料的制备方法;指出与环氧复合材料相比,环氧树脂/水滑石纳米复合材料具有良好的阻燃性能和抑烟效果,应用前景广阔.     

Cathodic Delamination of an Epoxy/Polyamide Coating from Steel

X-ray photoelectron spectroscopy (XPS) has been used to determine the mechanism responsible for debonding of an epoxy/polyamide coating from steel during cathodic delamination in 3.5% aqueous NaCl solutions. Coating failure always occurred near the interface between the coating and the oxide. The nitrogen content of the free surface of the prepared coatings was about 10%. However, the nitrogen content of the free surface dropped to only 5% after exposure to 1 N NaOH for four weeks and that of the coating failure surface after cathodic delamination was only about 2%, implying that the failure involved degradation of the polyamide curing agent by hydroxide ions formed at the steel surface by reduction of oxygen. That conclusion was supported by results obtained from curve fitting of C(1s) and O(1s) spectra. The intensity of components in the C(1s) spectra due to C—N and C≡O bonds in amide functional groups decreased significantly after coatings were exposed to NaOH or subjected to cathodic delamination. Small amounts of organic materials characteristic of the coating were observed on the substrate failure surface, perhaps indicating that the failure was cohesive within the coating but very close to the interface or that some products from degradation of the curing agent precipitated on the substrate. Use of silane coupling agents to retard cathodic delamination was also investigated. Coupling agents were added directly to the coating or applied to the substrate as a primer before application of the coating. Significant reduction in the rate of cathodic delamination was seen only when the silane coupling agent was applied to the substrate and cured at elevated temperatures before the epoxy/polyamide coating was applied.     

脱水蓖麻油制备聚酰胺/环氧树脂体系的固化行为及固化工艺

采用脱水蓖麻油制得聚酰胺固化剂,并用差示扫描量热法(DSC)研究了该固化剂与环氧树脂体系的固化动力学模型。根据Kissinger方法和Crane方法得到该固化体系的动力学参数:表观活化能Ea为45.81kJ/mol,反应级数n为0.88,频率因子A为3.10×105s-1。由外推法得到体系最佳固化工艺为:起始固化温度为60℃,恒温固化温度为90℃,以及后处理温度为110℃。体系固化前后的红外光谱(FT-IR)进一步验证了该固化工艺的合理性。     

水性环氧固化剂的研发简史及其今后发展方向

阐述了水性环氧固化剂的研发简史,并对水性环氧固化剂各大类品种的特点做了扼要概括,同时指出了水性环氧固化剂今后发展的重点。     

无机生物涂层材料研究进展及应用

无机生物涂层材料是综合利用金属基体的高强度、高韧性、高塑性以及生物陶瓷的表面活性和生物相容性的优点，成为材料科学领域及生物医学工程领域研究的热点。文章详细介绍了惰性生物陶瓷涂层材料、生物活性玻璃涂层和生物陶瓷涂层的分类、性能及其应用。另外，对无机生物涂层材料的各种制备方法作了详细介绍，最后对无机生物涂层材料的研究前景作了展望。     

环氧树脂的无机增韧改性研究

为改善环氧树脂柔韧性差，耐蚀性不够理想的问题，对环氧树脂进行有针对性的纳米无机氧化物粉体改性处理，以获得综合性能优良的改性环氧树脂。通过本实验研究表明：在综合考虑改性环氧树脂产物性能和生产成本价格等因素的前提下，采用通用型环氧树脂CYD-127，保证催化剂A加入量合适，加入树脂量15％的纳米无机氧化物粉体N20进行改性，可以得到各方面性能满足要求的改性环氧树脂。     

纳米银系抗菌锦纶6的制备与应用

通过在纺丝过程中添加无机层状纳米银磷酸盐抗菌母粒制备出了一种持续、高效、广谱的抗菌锦纶6纤维。研究发现:采用低温纺丝技术,可有效地控制熔体氧化降解,减少断头和飘丝;减小侧吹风风速,降低纺丝速度,提高丝条上油量可降低条干不匀率;降低DTY加工速度、拉伸比、D/Y比及热箱温度有利于克服抗菌POY物理性能变化给DTY加工带来的不利因素。扫描电镜显示:抗菌粉体在纤维表面均匀分散,平均直径约1.0μm,较少发生团聚。抗菌实验表明:经洗涤100次后,纤维抗菌性能仍达99%。     

尼尼6／环氧树脂共混体系化学流变行为研究

利用转矩流变仪和应力流变仪对尼龙6/环氧树脂体系的化学流变行为进行了研究。结果表明：在热和剪切力的作用下，环氧树脂与PA6发生了化学微交联反应。使共混体系的转矩和熔体温度上升。研究了环氧树脂含量．转速和温度对共混体系的影响。反应共混物熔体量呈假塑性流体特征。随着环氧树脂含量的增加，共混物熔体的复数粘度和储能模量上升。     

尼龙6/环氧树脂共混体系化学流变行为研究

利用转矩流变仪和应力流变仪对尼龙6/环氧树脂体系的化学流变行为进行了研究。结果表明:在热和剪切力的作用下,环氧树脂与PA6发生了化学微交联反应,使共混体系的转矩和熔体温度上升。研究了环氧树脂含量、转速和温度对共混体系的影响。反应共混物熔体呈假塑性流体特征。随着环氧树脂含量的增加,共混物熔体的复数粘度和储能模量上升。     

Effect of Ultrasonic Dispersion Methods on Thermal and Mechanical Properties of Organoclay Epoxy Nanocomposites

This report highlights the importance of nanocomposite formation and dispersion upon improvements in properties for high performance epoxy based layered silicate nanocomposites. This is achieved through the preparation of epoxy nanocomposites with varying clay concentrations using ultrasonic and solvent based fabrication and standard shear mixing procedures. Ultrasonication (combined with a solvent), in comparison to shear mixing methods, produces superior nanoscale dispersion according to SEM and TEM. As a result of the improvements in nanoscale dispersion, the corresponding improvements in fracture toughness, strength, strain to failure (compressive and flexural) and char stability are presented. TGA shows that while the initial thermal decomposition process is not affected, the stability of the char layer formed during decomposition increases with improved nanoscale dispersion as well as increasing concentration. The effect of moisture upon the dynamic mechanical thermal analysis of the epoxy nanocomposites displays some dependence upon the clay dispersion with a modest increase in plasticisation for the sonicated samples. Overall, this work shows that for a high performance epoxy anhydride resin system, significant improvements in key properties can be achieved at low levels of addition if appropriate sonicated dispersion methods can be utilised.

     

环氧树脂E-44反应增容尼龙6/废印刷电路板非金属粉复合材料的力学性能和热变形温度研究

用环氧树脂E-44作为反应性的增容剂,采用熔融共混方法制备了尼龙6(PA6)/废印刷电路板非金属粉(N-PCB)复合材料。研究了E-44用量、挤出温度以及N-PCB粉末的粒径大小对PA6/N-PCB复合材料力学性能和热变形温度的影响。对复合材料抽提残留物的红外分析实验结果表明E-44与PA6/N-PCB复合材料中PA6以及N-PCB粉末表面发生了化学键合。添加1.25份E-44的PA6/N-PCB复合材料与纯PA6相比,其拉伸强度、拉伸模量、弯曲强度和弯曲模量最大增幅分别为29%、49%、73%和72%,热变形温度提高了42.8℃,但其韧性降低。与未加增容剂相比,其拉伸强度、弯曲强度和缺口冲击强度最大增幅分别为9%、8%和43%,热变形温度提高了9.3℃。     

环氧丙烯酸酯合成及应用的研究进展

介绍了环氧丙烯酸酯从双酯合成到双酯的改性,以及近几年新提出的单酯合成及应用的研究现状,评述了环氧丙烯酸酯,尤其是环氧丙烯酸单酯合成的研究进展。     

水性环氧树脂涂料研究与应用进展

系统地介绍了环氧树脂水性化技术,包括机械法、相反转法、固化剂乳化法及化学改性法,并对各方法进行了评论。环氧树脂分子链上带有环氧基、羟基等活泼基团,可以与其它树脂复合使用,提高水性环氧树脂涂料的综合性能,常用方法有聚氨酯改性、聚丙烯酸酯改性、磷酸酯改性、有机硅改性以及纳米粒子改性。介绍了水性环氧树脂涂料的主要应用领域,并对其发展前景进行了展望。     

环氧树脂与热塑性树脂的共混研究进展

综述了国内外有关环氧树脂与热塑性树脂共混研究的最新进展。介绍了热塑性树脂增韧环氧树脂体系相态结构的控制，环氧树脂改性热塑性树脂，以降低难加工聚合物加工温度、改进某些热塑性树脂(如PVC，PET)的力学性能，以及利用环氧基团的活性改善不相容热塑性树脂共混体系的相容性的研究进展。     

聚酰胺工程塑料生产、市场及其趋势

综述了全球聚酰胺工程塑料生产、市场、应用结构、需求预测和最新动向等,包括全球不同地区和国家聚酰胺6和聚酰胺66工程塑料的生产能力、消费量,在汽车和电子电器等工业上的应用,未来供需趋势和价格预计,并介绍了中国聚酰胺工程塑料工业现状。     

Study on the Flammability,Crystal Behaviors and Mechanical Performance of Polyamide 11 Composites by Intercalated Layered Double Hydroxides

Sulfamic acid-intercalated MgAl-LDH (SA-LDH) was prepared by an anion exchange method, and its structure was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). SA-LDH was introduced into polyamide 11 (PA11) by melt blending and to enhance the flame retardancy and mechanical properties. The scanning electron microscope (SEM) and XRD data showed that the lamellar structure of SA-LDH was partly disrupted. The cone calorimeter (CCT) results demonstrated that SA-LDH could effectively decrease the value of heat release rate, which may be ascribed to the better distribution of SA-LDH compared to LHD in the PA11 matrix. The effects of SA-LDH on the crystal behaviors of PA11 were investigated by XRD and differential scanning calorimetry (DSC), indicating that SA-LDH could induce the formation of new crystal forms and served as a heterogeneous nucleating agent. The mechanical progress caused by the incorporation of SA-LDH was correlated with compatibility improvement between SA-LDH and PA11.