尼龙66和马来酸酐LDPE接枝共聚物的力学性能

将马来酸酐和LDPE进行接枝反应后得到的共聚物，和尼龙66共混，由于LDPE－g-MAH上的酸酐基团与尼龙66上的胺基相互作用，它们有很好的相容性，随着LDPE－g-MAH加入量的增加，尼龙66的冲击韧性有很大提高。     

马来酸酐接枝聚乙烯黏合树脂对尼龙6的黏接性能

使用双螺杆熔融接枝制备了一系列马来酸酐接枝聚乙烯(PE-g-MA),相对接枝率范围从0.081～0.281。进一步将PE-g-MA和未经改性的线型低密度聚乙烯(LLDPE)共混制备黏合树脂,采用热压复合的方法研究其对PE/尼龙6(PA6)复合膜和PA6/PA6复合膜的黏接性能。当PE-g-MA的相对接枝率为0.081时,黏合树脂对PA6的剥离强度随PE-g-MA含量增加而增大;PE-g-MA含量为100%时对PE/PA6和PA6/PA6的剥离强度分别为60 N/cm和40 N/cm。提高PE-g-MA的接枝率,黏合树脂对PA6的剥离强度会随PE-g-MA含量增加而先增后减。PE-g-MA的含量为100%时黏合树脂对PA6的剥离强度随PE-g-MA接枝率升高而下降。通过表面全反射红外光谱(ATR-FTIR)表征复合膜剥离后的PA6表面的残余氨基含量,相比复合前最高下降46.5%。氨基残余量越少,剥离强度越大,MA基团和PA6端氨基的反应程度是影响剥离强度的直接因素。     

尼龙1010／马来酸酐接枝聚乙烯共混体系结晶行为和力学性能的研究

将尼龙1010与马来酸酐接枝聚乙烯进行熔融共混,使用DSC、扫描电镜等方法研究了共混物的结晶行为、共混物形态以及力学性能。结果表明:接枝聚乙烯通过与尼龙1010在熔融共混时生成的接枝共聚物改善了共混组份两相之间的相容性和共混形态;共混物中尼龙组份的结晶熔融热焓下降;共混物在保持较高刚性的同时其干态及低温冲击性能较纯尼龙1010有明显提高。     

聚乙烯接枝马来酸酐产品的组成和性能

通过反应性挤出可以得到聚乙烯接枝马来酸酐（ＰＥ－ＭＡ）产品。实验发现，ＰＥ－ＭＡ的接枝率（Ｇ）随引发剂ＤＣＰ用量的增加而增加，混合物料在挤出机料筒中停留２ｍｉｎ，接枝反应可充分完成，约有３５％的马来酸酐单体以化学键接枝到聚乙烯分子链上。力学性能的研究表明，ＰＥ－ＭＡ的拉伸强度略高于纯ＰＥ，且随ＰＥ－ＭＡ接枝率的增加而增大。流变学研究表明，ＰＥ－ＭＡ是符合幂律方程的非牛顿假塑性流体。其表观粘度随Ｇ的     

马来酸酐接枝聚丙烯对亚麻纤维增强高密度聚乙烯力学性能影响

通过双螺杆挤出造粒,制备了亚麻纤维增强高密度聚乙烯（PE-HD）复合材料,研究了相容剂马来酸酐接枝聚丙烯（PP-g-MAH）含量对于复合材料性能改善的效果。结果表明：复合材料力学性能得到了显著的提升,其中拉伸强度、弯曲强度和冲击强度最大值分别为32.75、37.21、43 kJ/m2;PP-g-MAH含量为5 ％或者10 ％时复合材料具有相对较好的力学性能;PP-g-MAH的加入能提高复合材料的耐热性,降低复合材料力学损耗。     

聚乙烯与马来酸酐熔融接枝及对铝片接枝性能研究

采用转矩流变仪，在过氧化二异丙苯（DCP）为引发剂，熔融接枝法制备LLDPE、HDPE与马来酸酐（MAH）的接枝共聚物，红外光谱表征了接枝物的结构，研究分析了产物的接枝率、熔体流动速率及对铝片的粘接后的剥离强度。     

尼龙6／马来酸酐接枝聚乙烯共混物力学性能的研究

尼龙6与马来酸酐接枝聚乙烯在螺杆挤出机中挤出共混、通过扫(?)电镜对共混物的形态分析以及对共混物冲击强度、拉伸强度、吸水率的测定、发现共混体系中两相具有(?)好的相容性。共混物干态、低温冲击强度较尼龙6有大幅度提高,并且尼龙6的吸水性也得到了改善。     

环氧树脂与苯乙烯对马来酸酐接枝聚乙烯性能的影响

实验通过工艺优化制备聚乙烯接枝马来酸酐(PE-g-MAH),研究了添加不同含量环氧(EP)、苯乙烯(St)制备的PE-g-MAH的熔融指数、接枝率和红外光谱性能。阐述了环氧、苯乙烯加入接枝体系的接枝机理。结果显示红外光谱显示加入环氧的接枝体系中马来酸酐(MAH)基团反应形成了酯,部分环氧接枝到了大分子链上。环氧树脂的加入大大增加了聚乙烯的交联,苯乙烯加入马来酸酐接枝聚乙烯体系后能得到很好的接枝率和熔体流动性。     

马来酸酐接枝聚乙烯

介绍在有机过氧化物引发剂作用下,马来酸酐熔融接枝聚乙烯的制备方法、工艺以及马来酸酐接枝聚乙烯的应用。重点讨论了含N、P、S等给电子体化合物对接枝产物的影响,及马来酸酐接枝聚乙烯作为粘合剂、无机填料处理剂、不相容或相容性较差的聚合物体系的相容剂等方面的应用。     

聚烯烃接枝马来酸酐接枝率的测定—聚乙烯接枝

以非均相化学接枝法和红外光谱法相结合的方法绘制了定量校正曲线,可用于红外光谱法测定聚乙烯接枝马来酸酐的接枝率。该方法简便快速,准确可靠,重复性好。     

Effect of different types and loadings of modified nanoclay on mechanical properties and adhesion strength of EPDM-g-MAH/nylon 66 systems

In this study, the effect of different levels and loadings of modified nanoclay (NC), nanoclay 1 CEC, 2 CEC and 4 CEC, cation exchange capacity on mechanical properties and adhesion strength of maleic anhydride grafted ethylene-propylene-diene terpolymer (EPDM-g-MAH)/nylon 66 systems were investigated. Fourier transform infrared (FTIR) data confirmed the reaction mechanism between maleic anhydride in the polymer backbone and the organomodifier of the nanoclay. Dynamic mechanical analysis (DMA) results showed that on increasing the levels of nanoclay modification, the storage modulus (Eʹ) increased as well as the glass transition temperature (T_g) was slightly shifted to lower temperature and the height of the damping property (tan δ) peaks decreased. The results revealed that the use of the three levels of modified clay with EPDM-g-MAH had significant effects on the tensile strength and elongation at break, especially at 5 parts per hundred rubber by weight (phr) filler content. Whereas in the case of lower nanoclay filler contents (i.e. 1 and 3 phr) the results clarified that they had little effect on tensile and elongation at break values. Pull-out adhesion tests showed that the adhesion force of NC 2 CEC nanocomposite was approximately twice that of the virgin polymer while the nanocomposite NC 4 CEC showed inferior adhesion values, especially at 5 phr filler content. Scanning electron microscopy (SEM) clarified that good wettability of elastomer took place, especially in case of NC 2 CEC which in turn led to an enhancement of the adhesion force between the elastomer and the nylon 66 cord.     

尼龙66基复合材料的研究进展

综述了近年来尼龙66(PA66)复合材料的研究状况和技术进展,重点讨论了PA66合金、PA66无机纳米复合材料和PA66填充增强改性,并对PA66复合材料的制备方法进行了介绍。同时对PA66复合材料的发展趋势及应用前景进行了分析和展望。     

Nanoindentation and morphological studies on nylon 66 nanocomposites. I. Effect of clay loading

Nanoindentation technique has been used to investigate the mechanical properties of exfoliated nylon 66 (PA66)/clay nanocomposites in present study. The hardness, elastic modulus and creep behavior of the nanocomposites have been evaluated as a function of clay concentration. It indicates that incorporation of clay nanofiller enhances the hardness and elastic modulus of the matrix. The elastic modulus data calculated from indentation load-displacement experiments are comparable with those obtained from dynamic mechanical analysis and the tensile tests. However, the creep behavior of the nanocomposites shows an unexpected increasing trend as the clay loading increases (up to 5 wt%). The lowered creep resistance with increasing clay content is mainly due to the decrease of crystal size and degree of crystallinity as a result of clay addition into PA66 matrix, as evidenced by optical microscopy and X-ray diffraction. At lower clay concentration (here ≤5 wt%), morphological changes due to addition of clay plays the dominant role in creep behavior compared with the reinforcement effect from nanoclay.     

Nanoindentation and morphological studies on nylon 66/organoclay nanocomposites. II. Effect of strain rate

Strain rate effects on surface deformation behavior of exfoliated nylon 66 (PA66)/organoclay nanocomposites have been explored by nanoindentation in present study. Sharp indenter (Berkovich) has been used to indent on the surfaces of polymer/clay nanocomposite with different strain rates. Significant strain-rate hardening has been found consistently existing in both neat PA66 and its nanocomposite systems from surface to subsurface (a few micron deep into the bulk). However, strain rate shows almost no effect on the elastic moduli of the neat system and the nanocomposites. The elastic modulus and hardness increase with the indentation depth due to inhomogeneous distributions of the crystalline morphology as well as clay concentration for the case of the nanocomposites along the indentation direction. The mechanical properties observed are correlated with the inhomogeneous microstructures of the studied systems. The plastic index of PA66 and the nanocomposites have been evaluated as a function of strain rate.     

Effect of polyurethane structure on mechanical properties of nylon-66/polyurethane blends

A polyamide (nylon-66, N66) was blended with a series of polyurethanes (PU) based on different polyols or chain extenders. The effects of PU structure and content on the mechanical properties of the blends were investigated. The morphology of the polyblends was examined by scanning electron microscopy. The Izod impact strength of the blends increased with increasing PU content and showed a maximum value at the composition of 15 wt % PU. The effects of moisture content on the mechanical properties of the blends were also investigated. It was found that the water-toughened N66 could be further toughened by the addition of PU. Polyester-type PU rather than polyether type PU was recommended for the toughening of N66 because the blends containing the former showed higher tensile strength and Izod impact strength except at very low moisture (0.3 wt %) content. Carboxyl groups was introduced into the molecular chains of PU by using dimethylol propionic acid as chain extender replacing part of 1,4-butanediol. The blends containing PU with carboxyl groups showed a lower Izod impact strength than those without carboxyl groups in the structure of PU.     

Aggregation structure and molecular motion of (glass-fiber/matrix nylon 66) interface in short glass-fiber reinforced nylon 66 composites

Aggregation structure and thermal molecular motion of an adhered polymer layer on a glass-fiber (GF) surface after a removal of nylon 66 from a short glass-fiber reinforced nylon 66 were studied on the basis of photoacoustic spectroscopy-infrared spectroscopy (PAS-IR), pyrolysis-gas chromatography (Py-GC), X-ray photoelectron spectroscopy (XPS) and scanning viscoelasticity microscopy (SVM). PAS-IR, Py-GC and XPS measurements of the GF surface showed the presence of strongly adhered nylon 66 layer on the surface of aminosilane-treated GF. The glass transition temperature, T_g, of the adhered nylon 66 layer on the glass-fiber surface was directly evaluated on the basis of SVM measurement. In the case of the GF treated with an aminosilane coupling agent and a sizing agent, the magnitude of T_g at the (GF/nylon 66) interfacial layer was higher than that of the matrix nylon 66 due to the effective restriction of thermal molecular motion of nylon 66 at the (GF/nylon 66) interfacial layer. It is reasonable to consider that the sizing agent affects the strong interfacial interaction between a glass-fiber surface and matrix nylon 66 with covalent bond formation accompanying the network structure formation.     

功能化聚丙烯的制备及对聚丙烯与尼龙66共混体系的增容作用

讨论了马来酸酐含量、反应时间、引发剂用量、抗氧剂用量等对马来酸酐功能化聚丙烯的影响,及马来酸酐功能化聚丙烯对聚丙烯与尼龙６６共混体系的增容作用。     

湿度对锦纶66帘线强伸性能的影响

进行了湿度对锦纶66帘线强伸性能影响的试验研究。通过统计分析断裂强力、断裂强力不匀率、定负荷伸长度、断裂伸长率、断裂伸长不匀率等旨标的试验数据并结合理论分析，得出随着相对湿度的增大，锦纶66帘线断裂强力下降，定负荷伸长率、断裂伸长率及断裂强力不匀率、断裂伸长不匀率增大的结论。     

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.