PP／PA66原位复合材料的成纤性与力学性能

用挤出－拉伸－注塑法制备了PP／PA66原位复合材料，研究了拉伸比（λ）和增容剂用量（Cg）对PA66成纤性和材料力学性能的影响。结果表明：增大λ有利于成纤，能明显提高材料的冲击强度（αk），拉伸强度（σt）也有增益；增加Cg不利于成纤，导致αk下降，但能改善界面粘结而使σt明显提高；材料σt和αk分别主要受界面结构和纤维形态控制，决定了它们随λ和Cg的变化规律。     

阻燃剂对玻纤增强尼龙66性能的影响

比较和分析了不同类型阻燃剂对玻纤增强尼龙（PA）66性能的影响。结果表明，在PA常用阻燃剂卤化物，红磷和氮化物中，红磷是帛得具有良好力学性能，电性能的阻燃增强PA66的最佳阻燃剂：溴化物阻燃的玻纤增强PA66也具有良好的综合性能；氮化物需加入较多的用量才能获得同样的阻燃效果；采用氮－磷或溴－磷复合阻燃体系可提高阻燃效果，减少阻燃剂总用量，从而保持玻纤增强PA66较高的力学性能，使其有更优异的使用性能。     

PA66／EVA-g-MAH／绢云母复合材料的研究

为了弥补EVA-g-MAH增韧聚酰胺66时导致强度下降过多的缺点，采用绢云母作为增强剂，通过双螺杆挤出机采用熔融挤出法制备了聚酰胺66／EVA-g-MAH／绢云母复合材料。绢云母用偶联剂处理前后体系的界面形态的SEM照片表明，偶联剂提高了绢云母与树脂的界面结合力，改善了绢云母粒子在树脂中的分散状态，增加了两相的相容性。使用偶联剂后，PA66／EVA-g-MAH／绢云母体系较之未加绢云母体系和绢云母未用偶联剂处理体系，其拉伸强度、弯曲强度和热变形温度等性能都有提高，是一种综合性能较好的复合材料。     

Thermal decomposition kinetics of photooxidized nylon 66

The thermoanalytical method offers a convenient means for testing a starting material before the end application. Differences in the kinetic parameters between neat and irradiated nylon 66 samples were estimated in the temperature range of 25°C–800°C by thermogravimetric analysis (TGA) and in the range of 25°C–300°C by differential scanning calorimetry (DSC). Under nitrogen flux the average activation energy for decomposition was in the range of 12.2–26.9 kcal/mol for the neat sample and 15.7–33.1 kcal/mol for the irradiated sample (250 h). Activation energy is affected by the process of bond breaking at the C? N bonds, which is the rate‐determining step of the decomposition in nylon 66. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 87: 2146–2150, 2003     

氯化钙对尼龙6/66结晶态结构的影响

本文采用示差扫描量热法(DSC)、傅立叶变换红外光谱法(FTIR)研究了CaCl2对尼龙6/66结晶态结构的影响.DSC测试结果表明,随着尼龙6/66中CaCl2含量的增加,尼龙6/66的结晶温度、熔融温度降低,结晶度逐渐减小直至变为无定型态.红外光谱研究结果证实了钙离子能够插入尼龙6/66分子链,与尼龙6/66分子链上的羰基发生络合作用,破坏尼龙6/66原有的氢键,阻碍尼龙6/66分子链的自由运动,从而使其无法结晶.     

Influence of thermal processing on the perfection of crystals in polyamide 66 and polyamide 66/clay nanocomposites

A study of the changes in crystal perfection of polyamide 66 (PA66) and polyamide 66/clay nanocomposites (PA66CN) due to different thermal processing was carried out. We designed three series of thermal processing including melt-quench (MQ), post-annealing MQ sample (MQA), and melt–slow cooling–annealing (MSA). The annealing temperature was set as 180 or 210 °C, which is within Brill temperature range of PA66. Fourier transform infrared (FT-IR) spectroscopy and wide angle X-ray diffraction (WAXD) were employed to characterize the perfection in short-range order and long-range order structures, respectively. The results showed that the crystal perfection of PA66 and PA66CN with different thermal processing is quite different, and the changing fashions with thermal processing for different ordered structures are not similar. In this work, MSA is optimal thermal processing for high crystallinity and crystal perfection. Exfoliated nanoclay layers exert considerable impact on the perfection of long-range ordered structures, but little on that of short-range ordered ones.     

改善染色尼龙66的湿牢度和抗沾污性的研究

用酸性染料染色后的尼龙66样品置于试验主染色机中，用合成丹宁进行后处理，浴比：1：20。合成丹宁的用量为2％(o．w．f），用醋酸调节PH至3．5-4。处理浴比的温度为40℃，然后升温至80℃，保温30分钟。测色结果显示：经处理后的染色尼龙66明显改善了其湿处理牢度和强物的沾色性能。     

New kinetic model for polymerization process of nylon 66 salt solution based on functional group non-isoactivity

The polymerization process of nylon 66 salt solution is a dynamically controlled process. Based on the assumption of unequal activity of functional carboxyl and amido groups, a new nylon 66 salt solution polymerization kinetic model was established by introducing the nylon salt dehydration reaction to the acid-catalyzed third-order reaction kinetic model and fitted to obtain the corresponding key kinetic parameters. The fitted salt dehydration reaction rate constant was 8.17×10^-3 kg?mol^-1?h^-1, while the activation energy was 19859 cal?mol^-1, respectively. Compared with Mallon model, the new developed model has a better fitting effect and can accurately predict the change of the polymerization process in a wider range of temperature and water content. Simulation results showed that salt dehydration reaction has an important effect on the polymerization process and the polymerization efficiency was relatively lower with higher concentration of nylon salt, especially under low temperature and high water content. Appropriately increase the reaction temperature or reduce the initial water content can accelerate the nylon salt dehydration reaction, thereby increasing the polymerization reaction efficiency. New nylon salt polymerization kinetics modeling method is not only applicable to nylon 66, but also to nylon 1212 and other salt solution polymerization systems.     

硫酸钡填充改性聚酰胺66的研究

研究了聚酰胺66（PA66）／硫酸钡复合材料的形态结构和力学性能，探讨了硫酸钡的表面处理对复合材料形态结构的影响以及活化硫酸钡对复合材料力学性能的影响。结果表明，在20％（质量分数，下同）活化硫酸钡和5％的乙烯-辛烯共聚物熔融接枝马来酸酐共混改性PA66复合体系中，少部分的硫酸钡对PA66具有异相成核剂的作用，大部分的硫酸钡对PA66具有增韧作用。与未加活化硫酸钡的相比，材料的拉伸强度提高了11SPa、弯曲强度提高了12SPa，简支梁缺口冲击强度提高了9kJ／m^2。     

低纤型1790dtex/2锦纶66浸渍帘布在轮胎中的应用

对低纤型1790dtex/2锦纶66浸渍帘布替代1870dtex/2锦纶66浸渍帘布在轮胎中的应用进行了研究。结果表明，采用低纤型1790dtex/2锦纶66浸渍帘布生产的10.00-2016PR轮胎的静负荷性能，压穿强度均符合国家标准，耐久性能达到国家A级产品水平，每条轮胎可降低成本1.6元。