POE-MAH对PA66/PP共混物形态结构和相容性的影响

通过扫描电镜（SEM）观察、差示扫描量热法（DSC）和广角X射线衍射分析（WAXD）,研究了POE－MAH对PA66／PP共混物的形态结构和相容性的影响。实验结果表明,POE－MAH的加入可使PA66／PP共混物由不相容的两结构向相容的均质网状结构转变,共混物的相容性和分散度得以提高,并在POE－MAH含量为9％时,其增容效果最好。随POE－MAH含量增加,PA66／66共混物的结晶度随之降低,同时共混物中PP的结晶行为及PA66和PP的微晶尺寸亦与POE－MAH含量相关。     

PA6/POE/SWR-3A超韧共混改性的研究

采用SWR-3A（POE—g—MAH）作为增容剂，研究了POE对PA6／POE／SWR-3A共混物的力学性能、耐热性和流变性能的影响。结果表明：在12．5份增容剂SWR-3A存在的条件下，随着POE 8150用量增大，共混物的缺口冲击强度不断增大，而拉伸强度、维卡耐热温度、表观粘度降低。当POE 8150用量超过12．5份时，共混物达到超韧。在PA6／POE／SWR-3A共混体系中，SWR-3A具有增容和增韧的双重作用。     

PA6／POE／EAA共混体系的相态与性能的研究

采用乙烯－1－辛烯共聚物弹性体（POE）为增韧剂、乙烯－甲基丙烯酸共聚物（EAA）作为增溶剂制备了以尼龙6（PA6）为基体的PA6／POE／EAA共混合金。详细研究了弹性体用量与共混体系的亚微观相态、力学性能和流变性能的关系。结果表明随着弹性体含量的增加，共混体系的分散相粒子尺寸大小没有明显变化，共混体系的冲击强度增加，拉伸强度和弯曲弹性模量降低。弹性体的增加使体系的熔体粘度降低，改善了体系的加工性能，但当POE增加到20％时，随着POE的增加，粘度不再下降。     

POE和POE-g-MA对PA66复合材料结构和性能的影响

分别研究了乙烯一辛烯共聚物（POE）和马来酸酐接枝乙烯-辛烯共聚物（POE-g-MA）对尼龙66（PA66）和20wt％纳米碳酸钙／尼龙66（nano-CaCOJPA66）复合材料力学性能和熔体流动速率（MFR）的影响,用扫描电子显微镜（SEM）、差示扫描式量热法（DSC）和X射线衍射（XRD）等观察和表征了复合材料的形貌和结构。研究表明,POE或POE-g-MA可改善PA66熔体的加工性能,提高PA66的结晶温度。与非相容性POE／PA66和20wt％纳米CaCOJPOE／PA66共混体系相比较,POE-g-MA能明显地细微分散在PA66和20wt％CaCOJPA66复合材料中,促进界面结合,通过有效应力传递赋予复合材料较高的冲击韧性．使拉伸强度的降低程度减弱。     

PA66／PP／POE—MAH合金的形态结构与力学性能

通过直接共混法制备了PA66／PP／POE－MAH合金，性能测试表明PA66／PP／POE－MAH合金的常温及低温缺口冲击强度较原PA66有较大提高，而吸水率则明显下降，拉伸强度变化不大。DSC测试显示，POE－MAH可降低PA66及PP的熔点及热焓，表明POE－MAH影响着PA66和PP的两相界面作用和结晶行为，SEM照片显示分散相粒径大小及两相界面结构与POE－MAH含量相关。     

PS／PA6／SEBS-g-MA共混体系的非等温结晶行为、流变性能及力学性能的研究

聚苯乙烯（PS）／聚酰胺（PA6）共混物中加入5份的马来酸酐接枝氢化苯乙烯-丁二烯嵌段共聚物（SEBS-g—MA），提高了PA6的结晶度，但使结晶时问延长。非等温结晶动力学研究表明，在结晶前期，SEBS-g—MA可能对PS／PA6中的PA6有异相成核的作用，结晶后期，PS／PA6和PS／PA6／SEBS-g—MA的结晶方式基本一致。加入SEBS-g—MA，原位生成SEBS-g-PA6，提高了共混物的复数黏度（η^＊）和储能模量（G’），在G’相同的情况下，PS／PA6／SEBS-g-MA的损耗模量（G″）低于PS／PA6。PS／PA6／SEBS-g—MA（50／50／5）共混物的冲击强度较PS／PA6（50／50）略有降低，拉伸强度略有提高。当SEBS-g-MA的用量大于5份后，拉伸强度降低，断裂伸长率增加，共混物的冲击强度随SEBS-g—MA含量的增加不断提高，PS／PA6／SEBS-g—MA（50／50／20）的冲击强度提高了2．4倍。     

PA6/POE/黏土纳米复合材料的非等温结晶行为

采用差示扫描量热仪(DSC)方法研究尼龙6(PA6)及尼龙6/聚烯烃弹性体(POE)/黏土纳米复合材料的非等温结晶及熔融行为,随着降温速率的增加,PA6和PA6/POE/黏土纳米复合材料的结晶峰变宽,结晶峰向低温移动.在相同降温速率下,PA6/POE/黏土纳米复合材料在更高的温度下结晶;PA6和PA6/POE/黏土纳米复合材料中晶体呈三维生长.降温速率的增加和有机黏土的加入会使体系结晶速率增加;PA6/POE/黏土纳米复合材料的结晶活化能低于PA6.     

PA6/TPU共混物的结构与性能

采用X射线衍射仪、示差扫描量热仪和扫描电子显微镜测试了PA6／TPU共混物的结构和热性能。结果表明，PA6／TPU共混物为结晶高聚物，但其结晶度较PA6降低了15％左右；随着PA6／TPU共混物中TPU用量的增大，共混物的熔点降低，而结晶温度升高；当TPU用量为15份时，共混物的相态为“海一海结构”，具有良好的相容性。     

原位聚合法制备马来酸酐化EPDM/PA6共混型热塑性弹性体

采用电子同步转移反应（Ene Reaction）制备了马来酸酐化EPDM（EPDM—g—MAH），并在EPDM—g—MAH中原位聚合己内酰胺生成尼龙6（PA6）制备了EPDM—g—MAH／PA6共混型热塑性弹性体。采用X-射线衍射法（XRD）和差示扫描量热法（DSC）研究了原位聚合法和直接共混法制备的EPDM—g—MAH／PA6共混体系的结晶行为。研究表明，230℃下进行阴离子聚合得到的PA6为β-介晶型；EPDM对这种分散在橡胶相中的PA6的结晶具有异相成核作用；原位聚合可在反应增容的基础上使得共混物中PA6的结晶焓进一步降低。动态力学分析频率谱研究表明，增容和原位聚合在削弱PA6组分对刚度贡献的同时可提高橡胶相的弹性响应。     

相容剂对PP/PA6复合材料力学性能的影响

研究了2种相容荆PP—g-MAH（马来酸酐接枝聚丙烯）、POE—g—MAH（马来酸酐接枝乙烯辛烯共聚物）对PP／PA6（聚丙烯／聚酰胺6）共混体系力学性能的影响。研究结果表明，2种相容荆的加入都使PP／PA6体系的相容性增加，但PP—g—MAH的加入主要表现为增强效果，而POE-g-MAH的加入主要表现为增韧效果。     

Nonisothermal crystallization kinetics of PA6 and PA6/SEBS-g-MA blends

The non-isothermal crystallization kinetics of neat PA6 and binary blends of PA6/SEBS-g-MA were investigated by means of differential scanning calorimetry at four different coolings rates. Three macro kinetic models, viz. Avrami, Jeziorny and Tobin, were used to describe the non-isothermal crystallization kinetics. Primary and secondary crystallization were analyzed by Avrami equation. The results obtained by Avrami equation suggested that under non-isothermal condition, the mechanism of primary crystallization is more complex, while secondary crystallization showed one to three dimensional crystal growths. Tobin model described the overall crystallization kinetics and results were almost similar to those of Avrami model. The results obtained by Dobreva and Gutzowa method suggested that SEBS-g-MA did not act as a nucleating agent for PA6. Three isokinetic models (Augis-Bennet, Kissinger and Takhore) have been used for the evaluation of the activation energy of non-isothermal crystallization kinetics process. The value of activation energy ?E slightly increases in the presence of 5, 10, 20?phr content of SEBS-g-MA and then decreases with at 35 and 50?phr contents of SEBS-g-MA. These results showed that up to 20?phr SEBS-g-MA hinder the mobility of PA6 chain segments and at 35 and 50?phr SEBS-g-MA eases the mobility of PA6 chain segments.     

PA6－PEG共聚纤维和PA6－PEG／PA6共混纤维的物理与力学性能

研究了ＰＡ６－ＰＥＧ共聚纤维以及不同组成比的ＰＡ６－ＰＥＧ／ＰＡ６共混纤维的各项性能。得到了平衡吸湿率可达８％左右的改性纤维。纤维的染色性和手感也有显著改善，力学性能可满足纺织加工的要求。     

PA6－PEG共聚纤维和PA6－PEG／PA6共混纤维的物理与力学性能

研究了ＰＡ６－ＰＥＧ共聚纤维以及不同组成比的ＰＡ６－ＰＥＧ／ＰＡ６共混纤维的各项性能。得到了平衡吸湿率可达８％左右的改性纤维。纤维的染色性和手感也有显著改善，力学性能可满足纺织加工的要求。     

Exfoliated PA6,6 nanocomposites by modification with PA6

Minor amounts of a fully exfoliated PA6/commercial OMMT nanocomposite were used as a master-batch to produce exfoliated PA6,6 based nanocomposites. The major component PA6,6, which was fully mixed with PA6, did not largely affect the interactions between the OMMT and the surrounding polymer, as the exfoliation level of OMMT increased upon blending with PA6,6. Both the phase behaviour and the mechanical properties of the nanocomposites were compared with those of the PA6,6-rich matrix, to assess the separate effects of the PA6 and the OMMT. The large exfoliation level attained, led to increases in the modulus of elasticity that reached 46% with 5 wt% OMMT, and to the presence of highly ductile materials up to 3 wt% OMMT content.     

PA6/PA6-g-MAH/云母复合材料的增韧研究

分别以乙烯-乙酸乙烯共聚物(EVA)、乙烯-1-辛烯共聚物(POE)、苯乙烯-丁二烯-苯乙烯共聚物(SBS)为增韧剂,研究了它们对聚酰胺6(PA6)/聚酰胺6接枝马来酸酐(PA6-g-MAH)/云母复合材料力学性能的影响。结果表明:以EVA为增韧剂所得复合材料的力学性能优于以POE或SBS为增韧剂所得复合材料;复合材料的冲击强度随EVA用量的增大而上升,当EVA用量为10%时,其冲击强度达到19.01 kJ/m2,较未经增韧改性的复合材料提高了5.29 kJ/m2;但复合材料的拉伸强度和弯曲模量均随增韧剂用量的增大而降低。     

Morphology evolution of miscible blends between crystalline PA6 and amorphous PA6IcoT

The morphology evolution of miscible blends of a semicrystalline polyamide 6 (PA6) and an amorphous polyamide 6Ico6T (PA6IcoT) was investigated using an internal Brabender mixer at a temperature range 220–260°C. Morphology of the blends was characterized by scanning electron microscopy (SEM) and laser particle analysis. Temperature rising dissolution was used to separate the different phases of the blends and the phase compositions were determined by Fourier transform infrared (FTIR) spectroscopy. The particle size evolution of the dispersed phase (PA6) was calculated and agreed well with experimental observation. It was found that the particle size was quickly reduced to nanometer scale after several minutes of processing. A convection‐diffusion model was adopted to study the phase evolution during melt–melt mixing stage and compute the dimension of each phase. The results strongly support the notion of existence of distinct phases during blending, whose development can be well described by the model. The dispersed phase is reduced mainly by stretching of flow, while the broadening of the blending phase can be primarily attributed to molecular diffusion. The study also suggests the possibility to prepare novel polymer blends with nanometer sized domain of high uniformity. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

尼龙6共混改性研究进展

系统介绍了国内外用聚乙烯、聚丙烯、PVDF、PAR、PET、PVOH、ABS、PC、PPO、SAN、弹性体、TLCP等改性尼龙 6的系列方法、研究成果及其性能 ,并提出了反应挤出共混改性和无机纳米材料改性尼龙 6的设想     

尼龙6/尼龙66合金的性能研究

研究了相容剂、增韧剂对改性尼龙6／尼龙66合金性能的影响。研究结果表明，以EVA／PE－g－MAH为相容剂、以PA6和PA66为基料、以EAA及PE为得合增韧剂改性的PA6／PA66合金，其吸水率有较大降低，且综合性能较好。