芳香族支链聚酰胺6的制备及共混纺丝研究

通过添加均苯四甲酸二酐水解聚合工艺制备芳香族支链聚酰胺6(PA6),采用熔融共混制备芳香族支链PA6/Ti O2母粒,然后与线型PA6共混纺丝,经拉伸后得到含芳香族支链PA6的共混纤维;研究了均苯四甲酸二酐含量对芳香族支链PA6流动性及热学性能的影响,以及芳香族支链PA6对芳香族支链PA6/Ti O2共混物结晶行为、可纺性及纤维力学性能等的影响。结果表明:随着均苯四甲酸二酐含量的添加,芳香族支链PA6的相对黏度逐渐降低,熔体流动指数增大,流动性增加,而结晶熔融温度逐渐降低;含芳香族支链PA6的共混体系纺丝温度较纯PA6降低4℃,芳香族支链PA6有助于提高PA6的可纺性,且纤维力学性能较好,含质量分数8%芳香族支链PA6的共混纤维的断裂强度为2.8 c N/dtex,断裂伸长率为45.4%。     

PA6对聚苯硫醚多峰熔融行为的影响

用差示扫描量热法（DSC）研究了聚苯硫醚（PPS）/聚酰胺（PA）6共混物熔融多峰行为，PPS及其共混物均出现熔融多峰现象。但共混物呈现更加复杂的熔融行为，虽然退火结晶温度，时间和DSC扫描速率不同，但共混物中PPS的低温熔融峰温明显地比纯PPS的高，认为PA6与PPS间的相互作用促使PPS无定形态的退火结晶完善性提高。熔融多峰现象用重组机理来解释。     

PA11/PA1010共混物的性能研究

采用熔体共混的方法制备了聚酰胺11/聚酰胺1010(PA11/PA1010)共混物,通过力学性能和差示扫描量热(DSC)测试,研究了PA11/PA1010共混物的力学与结晶性能。测试结果表明:PA1010对PA11同时具有增韧、增强作用;当PA11/PA1010为70/30时,共混物开始出现两个结晶峰和低温熔融峰;共混物的结晶和熔融以PA11为主,兼具有PA11和PA1010的优良性能;断裂伸长率、拉伸强度与缺口冲击强度均达到极大值。     

热致液晶聚酰胺对聚酰胺66结晶行为的影响

利用差示扫描量热仪（DSC）、广角X射线衍射（WAXD）和偏光显微镜（POM）等仪器研究了热致液晶聚酰胺（TLCP）对聚酰胺66（R％6）结晶行为的影响。结果表明：随TLCP的添加量从0增加到30％，共混物的结晶温度和结晶度分别从PA66的235．83℃和39．8％逐步下降为224．7℃和30．8％，PA66的结晶明显受到抑制；共混物中PA66衍射峰的强度随TLCP含量的增加而下降，（100）、（010）晶面间距分别从0．43667nm和0．37139nm增加到0．4414nm和0．37793nm；共混物球晶尺寸明显大于PA66，并且随TLCP含量增加PA66的球晶变得越来越不完善。     

聚酰胺6/丙烯酸酯橡胶共混物热性能和结晶行为研究

采用熔融共混法制备了聚酰胺6/环氧型丙烯酸酯橡胶(PA6/ACM)共混物,并通过差示扫描量热仪(DSC)、X射线衍射仪(XRD)和偏光显微镜(PLM)对PA6/ACM共混物的热性能和结晶行为及晶体形貌进行了研究。结果表明,随着ACM含量的增加,共混物的融熔温度(Tm)和结晶温度(Tc)均略有下降;由于环氧型ACM的加入,PA6的晶型也由γ晶型转化为 α晶型,且随着橡胶加入量的增加,结晶度逐渐降低,晶粒逐渐变小,结晶也越来越不完善;共混物的缺口冲击强度明显提高。     

PA6含量对PVC/PA6共混物形态结构与力学性能的影响

以EVA-g-MAH为相容剂,将PVC与自制的低熔点PA6共混制备了PVC/PA6共混物。通过扫描电子显微镜(SEM)和力学性能测试研究了PA6含量对PVC/PA6共混物形态结构及力学性能的影响。SEM分析结果显示:随着PA6含量的增加,PVC/PA6共混物的分散相尺寸逐渐增大,当PA6含量为10%时,共混物中分散相的分散尺寸最小为1μm;当PA6含量为50%时,共混物为两相共连续结构;当PA6含量为60%时,共混物中PA6为连续相,PVC为分散相。力学性能测试结果表明:当PA6含量为10%时,共混物的缺口冲击强度和拉伸强度都较PVC有明显提高,分别提高了约50%与30%,达到了6.29kJ/m2和60MPa。采用差示扫描量热仪(DSC)研究了PVC/PA6共混物的结晶温度,检测结果显示:PVC/PA6共混物呈现非晶结构。     

PA6/HBPA共混物的非等温结晶动力学研究

采用熔融共混法制备了聚酰胺6/含磷超支化聚酰胺(PA6/HBPA)共混物。通过差示扫描量热法(DSC)考察了该共混物的非等温结晶行为,并利用改进Avrami方程的Jeziorny法、Ozawa法和Mo法对DSC测试结果进行了非等温结晶动力学分析。结果表明:当HBPA用量为2%时,PA6基体的结晶度和结晶速率均有所提高,而进一步增大HBPA用量则会对PA6的结晶产生阻碍作用,致使结晶速率降低。另外,Ozawa法不适于描述PA6/HBPA共混物的非等温结晶动力学,Jeziorny法则仅适用于PA6/HBPA的结晶初期和中期,而Mo法很好地描述了PA6/HBPA共混物的非等温结晶行为,因而可用于PA6/HBPA的非等温结晶动力学分析。     

聚苯醚接枝马来酸酐/聚酰胺66共混物的制备与性能

通过辐照法将马来酸酐(MAH)基团接枝到聚苯醚(PPE)上,制备了PPE-g-MAH,将其和聚酰胺(PA)66通过熔融共混挤出方法制备了PPE-g-MAH/PA66共混物。采用差示扫描量热、吸水性实验、维卡软化和热变形实验、拉伸和冲击性能测试及动态力学性能测试等对PPE-g-MAH/PA66共混物性能进行了研究。结果表明,与PPE/PA66共混物相比,PPE-g-MAH/PA66共混物的耐热性能、力学性能和吸水性能均得到改善;随PPE-g-MAH含量的增加,PPE-g-MAH/PA66共混物中PA66的熔融温度和玻璃化转变温度均向PPE方向移动,表明两者的相容性有所提升,且共混物的维卡软化温度、热变形温度、25℃之前的储能模量均升高,吸水率降低;当PPE-g-MAH含量较低时,共混物拉伸强度提升明显而冲击强度升幅较小,当PPE-g-MAH含量较高时,共混物冲击强度提升明显而拉伸强度基本不变。因此,可以根据实际的应用要求选择合适的PPE-g-MAH含量。     

TLCPa/PA 66的非等温结晶动力学

研究了新型热致液晶聚酰胺(TLCPa)与聚酰胺(PA)66熔融共混物的非等温结晶行为。w(TLCPa)为0～30％的共混物的结晶温度和结晶度分别从PA 66的235．83℃和39．8％逐步下降为224．70℃和30．8％．PA 66的结晶明显受到抑制。w(TLCPa)为10％的共混物的Ozawa指数从PA 66的3～4降为2左右,共混物有着不同于纯PA 66的成核和晶体生长机理。TLCPa与PA 66具有较好的相容性。     

制备方式对PA6/PA6-66-1010共混物结构与性能的影响

采用原位共混和熔融共混分别制备了尼龙(PA)6/PA6-66-1010共混物。利用傅里叶变换红外光谱仪、差示扫描量热仪、动态热机械分析、力学性能测试和扫描电子显微镜对共混物的内部氢键作用、结晶熔融行为、玻璃化转变温度、力学性能及拉伸断裂形貌进行了表征。结果表明,原位共混物的分子链段的运动性和柔性好于熔融共混物,结晶温度、熔融温度、结晶度均低于熔融共混物,强度和韧性均优于熔融共混物。     

纳米PA替代PA6作基础树脂用料的研究

介绍了纳米聚酰胺（PA）的制备方法,并在PA6的传统应用领域内将纳米PA与PA6进行了性能对比,试验证明,纳米PA具有更好的刚性、耐热性,透明性等性能,完全可以替代PA6作为基础树脂用料。     

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。     

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     

阻燃尼龙66的研究进展

介绍了阻燃尼龙(PA)66近几年的研究进展,详细阐述了卤系阻燃剂、磷系阻燃剂、氮系阻燃剂及无机填料型阻燃剂等对PA66的阻燃效果及研究现状,并展望了阻燃PA66未来的发展方向.     

国外聚酰胺工程塑料发展概况

介绍国外聚酰胺(PA)工程塑料近年来生产、需求、应用及技术发展状况,并对2000年PA工程塑料的发展及市场需求进行了预测。     

耐热性聚酰胺９Ｔ

介绍了耐热性聚酰胺９Ｔ（ＰＡ９Ｔ）的开发、制造技术、特性和用途,并与ＰＡ４６进行了性能对比,结果发现,ＰＡ９Ｔ的吸水率低,结晶性高,耐热性、韧性、耐药品性及尺寸稳定性均佳。     

Morphology,thermal behavior,and mechanical properties of PA1010/PP and PA 1010/PP-g-GMA blends

The modification of polypropylene (PP) was accomplished by melt grafting glycidyl methacrylate (GMA) on its molecular chains. The resulting PP-g-GMA was used to prepare binary blends of polyamide 1010 (PA1010) and PP-g-GMA. Different blend morphologies were observed by scanning electron microscopy (SEM) according to the nature and content of PA1010 used. Comparing the PA1010/PP-g-GMA and PA1010/PP binary blends, the size of the domains of PP-g-GMA were much smaller than that of PP at the same compositions. It was found that mechanical properties of PA1010/PP-g-GMA blends were obviously better than that of PA1010/PP blends, and the mechanical properties were significantly influenced by wetting conditions for uncompatibilized and compatibilized blends. A different dependence of the flexural modulus on water was found for PA1010/PP and PA1010/PP-g-GMA. These behaviors could be attributed to the chemical interactions between the two components and good dispersion in PA1010/PP-g-GMA blends. Thermal and rheological analyses were performed to confirm the possible chemical reactions taking place during the blending process. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 1489–1498, 1997     

PP／PA共混改性研究进展

综述了近几年国内外PP/PA共混改性研究的新进展,指出了其研究方向和发展前景     

PPO／PA合金的研究进展

综述了聚苯醚／聚酰胺合金的增容、增韧、增强等研究发展情况，并对已商品化的产品作了简单的介绍。