聚酰胺/粘土纳米复合材料

聚酰胺／粘土纳米复合材料是一种新型的有机－无机纳米复合材料。在无机物含量远少于常规填充复合材料的情况下就可以具有较好的力学性能、阻隔性能等,热稳定性能也显著提高,并具有阻燃性和各向异性。是一种性能优异的、具有广泛应用前途的纳米复合材料。综述了该纳米复合材料的制备、性能和应用前景等。     

聚酰胺6/蒙脱石纳米复合材料的紫外光老化

聚合物 /层状硅酸盐纳米复合材料的研究十分活跃 [1～ 4 ] .聚酰胺 6/蒙脱石 ( PA6/MMT)纳米复合材料与纯聚酰胺 6( PA6)相比 ,模量和强度明显提高 ,耐热性能提高尤为显著 .光氧化行为材料科学领域的重要研究课题 .Admas等 [5]报道在紫外光照射下 ,聚丙烯 /粘土纳米复合材料的氧化速度要比纯聚丙烯的快 .对于 PA6/MMT纳米复合材料的光老化研究尚未见报道 .本文以傅里叶变换红外光谱定量研究手段 ,对比分析了 PA6/MMT纳米复合材料与 PA6的紫外光氧化性能 .1　实验部分　　采用熔体插层技术 ,将 PA6( Honeywell B1 0 0 MP)和有机蒙…     

聚酰胺／粘土纳米复合材料的掉备,结构表征及性能研究

聚酰胺／粘土纳米复合材料，由于粘土以纳米悄度均匀地分散在聚酰胺基体中以及粘土与基体间强的化学结合，较常规填充增强聚酰胺复合材料具有更高强度，模量，耐热，气体阻隔等性能，是一种性能优异的聚酰胺材料，本文重点综述了混杂材料的制备，结构表征，特殊的界面相互作用，力学性能，结晶行为及结晶动力学等方面的研究，并展望了该材料的应用前景。     

尼龙6/蒙脱土纳米复合材料的结晶行为

用广角Ｘ 射线衍射（ＷＡＸＤ）、差示扫描量热仪（ＤＳＣ）、小角激光散射（ＳＡＬＳ）等手段研究了尼龙６／蒙脱土纳米复合材料的结晶行为．结果表明分散在尼龙６基体中的蒙脱土纳米粒子起成核剂的作用．蒙脱土的表面改性增加了蒙脱土和尼龙６分子之间的界面粘接，它具有阻碍尼龙６结晶的作用，使结晶活化能增加     

聚丙烯基纳米碳纤维复合材料结晶行为研究

采用示差扫描量热法(DSC)研究了纳米碳纤维对PP／CNF复合材料中PP结晶行为的影响。结果表明：纳米碳纤雏可提高PP的结晶温度，但略降低其结晶速率和结晶度。提高纳米碳纤雏含量或减小纳米碳纤雏直径，PP结晶行为的上述变化更为明显，但结晶速率随纳米碳纤维含量出现先减小后增大的趋势。     

粘土/聚烯烃纳米复合材料研究进展

原位聚合;插层复合;粘土/聚烯烃纳米复合材料研究进展     

尼龙66/SiO2纳米微粒复合材料的结晶行为

采用双螺杆熔融共混法制备了尼龙66/S iO2纳米微粒复合材料,用X射线衍射法和示差扫描量热法比较了干态和湿态两种制备条件下复合材料的结晶行为;并用修正的Avram i方程的Jeziorny法研究了纳米复合材料的非等温结晶动力学行为.     

聚酰胺6／聚醚砜共混体系的结晶与熔融行为

聚醚砜（ＰＥＳ）是一种非晶特种工程塑料，具有强度好，使用温度高等特点，但熔体粘度高，加工上有一定困难．聚酰胺６（ＰＡ６）是部分结晶的工程塑料，有很好的强度和耐磨性能．加入适量的ＰＡ６，可显著地降低ＰＥＳ的熔体粘度，且可基本保持ＰＥＳ的原有性能［１］．...     

聚氧乙烯/粘土纳米复合材料的研究进展

聚氧乙烯(PEO)／粘土纳米复合材料．因为粘土的介入而具有更高的导电性、机械、热和界面稳定性，在电化学领域展现出了广泛的应用前景。本文对近十年来该材料的制备方法、插层结构、导电性、形态学以及流变学等研究进行了综述。     

聚合物/粘土纳米复合材料中的粘土有机化

回顾了聚合物/粘土纳米复合材料中所用粘土的有机化方法与有机粘土的热稳定性,及其对复合材料性能的影响,指出在聚合物/粘土复合材料中粘土片层间距的变化同样有可能受到层间插层剂构象变化的影响、聚合物/粘土纳米材料的长期热氧稳定性与热失重结果可能不一致。     

聚酰胺/粘土纳米复合材料的制备、结构表征及性能研究

聚酰胺／粘土纳米复合材料，由于粘土以纳米尺度均匀地分散在聚酰胺基体中以及粘土与基体间强的化学结合，较常规填充增强聚酰胺复合材料具有更高强度、模量、耐热、气体阻隔等性能，是一种性能优异的聚酰胺材料。本文重点综述了该混杂材料的制备、结构表征、特殊的界面相互作用、力学性能、结晶行为及结晶动力学等方面的研究，并展望该材料的应用前景。     

An Unusual Crystallization Behavior in Polyamide 6/Montmorillonite Nanocomposites

The crystallization behavior and structure of polyamide 6 (PA6) nanocomposites containing 3 wt.‐% montmorillonite (MMT) were investigated for different cooling conditions using differential scanning calorimetry and X‐ray diffraction. In sharp contrast to PA6 and other semicrystalline polymers, increased cooling rates resulted in higher crystallinity of PA6/MMT. The highest crystallinity (60.8%) occurred in the liquid nitrogen‐quenched PA6/MMT film. The results show that the γ‐crystalline form is dominant in the rapidly cooled PA6/MMT.     

Crystallization Behavior and Thermal Properties of PP/MgAl LDH Nanocomposites Prepared in Non-polar Solution

Polypropylene(PP)/MgAl layered double hydroxide(MgAl LDH) nanocomposites were synthesized by refluxing PP and dodecyl sulfate-intercalated MgAl LDH[MgAl(DS)] in non-polar xylene. Their structure, thermal and crystallization properties were studied via X-ray diffraction(XRD), transmission electron microscopy(TEM), thermogravimetric analysis(TGA), differential scanning calorimetry(DSC), and polarized light microscopy(PLM). The nanoscaled dispersion of MgAl(DS) nanolayeres in the PP matrix was verified by the disappearance of the d(003) XRD diffraction peak of MgAl(DS) and observation of TEM image. The DSC data show that the SDS/LDH inorganic components negatively affect the crystallization properties of PP and decrease the size of PP spherulites because the inorganic components act as additional nuclei. The PP/MgAl LDH nanocomposites have a faster charring progress in a temperature range of 250―430 °C and a better thermal stability above 320 °C than pure PP.     

Influence of clay surface modification with urethane groups on the crystallization behavior of in situ polymerized poly(butylene succinate) nanocomposites

The crystallization behavior and fine structure of poly(butylene succinate) (PBS) nanocomposites with intercalation (30B20) and exfoliation (30BM20) morphologies, respectively, were investigated via isothermal crystallization testing and synchrotron small-angle X-ray scattering (SAXS). The dynamic viscosity of 30BM20 was markedly increased due to favorable interactions between the PBS matrix and the urethane group on the clay surface. However, 30BM20 showed similar crystallization rates to that of homo PBS because the surface urethane modification for 30BM20 precluded PBS matrix from the metallic group into clay to difficult in contact with each other, resulting in a reduced nucleation activity for the metallic group. SAXS profiles revealed that the long period and amorphous region size for 30B20 drastically decreased during isothermal crystallization. Meanwhile, 30BM20 was similar to those of homo PBS. This result also supports the above explanation for isothermal crystallization behavior. Considering all results in total, the introduction of a urethane modification considerably enhanced the physical properties of PBS but caused delayed crystallization rates.     

COMPARISON OF POLYAMIDE 66/MONTMORILLONITE NANOCOMPOSITES PREPARED FROM POLYAMIDE 6 AND POLYAMIDE 66 BASED MASTER-BATCHES

Two master-batches,polyamide 66 (PA66)/organo-montmorillonite (OMMT) and polyamide 6 (PA6)/OMMT, prepared by melt compounding with methyl methacrylate (MMA) as co-intercalation agent,have been used to prepare nearly exfoliated PA661montmorillonite (MMT) nanocomposites.The resulting nanocomposites are compared in view of their morphology and properties.Nano-scale dispersion of OMMT is realized in both types of nanocomposites,as revealed by XRD,TEM and Molau tests.PA66/MMT nanocomposites having superior me...     

Water Sorption in Polyamide 6/Poly(Amino-ether) Blends. II. Mechanical Behavior

Polyamide 6 (PA)/poly(amino-ether of bisphenol A) (Blox) blends were placed in water for different times in an attempt to both find out whether the positive effects of Blox on the mechanical properties of PA are maintained in wet conditions, and to study the effects of solvent sorption on the mechanical properties of polymer blends.

After one week's sorption, the positive effects of the presence of Blox on the mechanical properties of PA were much larger than the composition would indicate, as 20% Blox led to a 100% increase in the modulus of elasticity with respect to that of the wet PA. After sorption for six weeks, the positive effects had decreased, attributed to a decrease in the interactions between PA and Blox, which was a consequence of the high miscibilized water content. The sorption/desorption process appeared to be only partially reversible as significant water contents remained in the blends even after very long desorption times and cracking was observed in blends very rich in Blox.     

聚丙烯酰胺/层状无机物纳米复合材料研究进展

聚丙烯酰胺(PAM)/层状无机物纳米复合材料相比于纯PAM具有更好的力学性能、超吸水性能、热稳定性能和气体阻隔性能等,是一种性能优异并在采油、农业和卫生学等领域有着广泛应用前景的新型聚合物基纳米复合材料。本文对近年来聚丙烯酰胺/层状无机物纳米复合材料的研究进展进行了综述。首先重点介绍了层状双氢氧化物(LDHs)在有机溶剂和水中剥离分散方面的研究进展,接着综述了PAM/LDH和PAM/粘土纳米复合材料的制备与结构表征,最后阐述了PAM/层状无机物纳米复合材料的流变性能、力学性能和超吸水性能等。     

聚酰亚胺/蒙脱土纳米复合材料

利用插层法合成的聚酰亚胺／蒙脱土纳米复合材料相比于纯聚酰亚胺有更好的力学性能、热稳定性、气体阻隔性及更低的介电性、吸湿性和热膨胀性。是一种性能优异、具有广泛应用前途的新型有机、无机－纳米复合材料。这是因为粘土在聚酰亚胺基体中以纳米尺度均匀分散并与基体形成了强的化学结合。本文重点综述了该复合材料的制备、结构表征及性能等方面的研究，并展望该材料的应用前景。