4种马来酸酐接枝物对PA66/TLCP共混物界面的增容作用

利用差示扫描量热法（DSC）和傅里叶红外光谱法（FTIR）研究了4种马来酸酐接枝聚合物对聚酰胺66／热致性液晶聚合物（PA66／TLCP）共混物界面的增容作用，并对PA66／TLCP共混物进行了力学性能测试和扫描电子显微镜（SEM）的微观形貌研究。DSC结果表明，4种马来酸酐接枝聚合物对PA66／TLCP共混物的熔融温度、熔融焓、结晶温度、过冷度和结晶度均有不同程度的影响；FTIR证明共混物界面发生增容反应。4种马来酸酐接枝聚合物对PA66与TLCP的界面相容性均有不同程度的改善，使共混物的力学性能提高，且改变了分散相在基体中的分散形态。     

LLDPE-g-GMA对PA66/PE性能影响的研究

研究了LLDPE—g—GMA(甲基丙烯酸缩水甘油酯)对PA66／PE相容性的影响。结果表明LLDPE-g-GMA是PA66／PE合金良好的反应型增容剂，对于PA66／PE合金，LLDPE—g-GMA的加入使合金的拉伸强度、弯曲强度、Izod缺口冲击强度有明显提高。但刚性和耐热性略有降低，并且DMA谱图证实了LLDPE—g-GMA对PA66／PE的反应增容作用，计算出了PA66／PE玻璃化转变活化能。     

小磷酸生产新进展

分析我国小磷酸装置存在的问题,介绍解决这些问题行之有效的方法:磷矿均化,配矿使用;采用ZL型真空冷却装置移走反应热提高装置能力;以及在设备、机泵、流量自调方面的技术进展。对小磷酸技改规模及生产工艺控制要点与适宜条件提出建议。     

聚苯醚／聚酰胺合金的研究

借助扫描电子显微镜和差示扫描量热仪以及动态粘弹谱仪等仪器，研究了聚苯醚／聚酰胺合金的工艺、结构和性能的关系。实验表明，同一种聚苯醚／聚酰胺合金因其加工工艺条件不同，其结构形态不同；韧性相差较大的同类材料，其结构形态也不同，但其ＤＳＣ曲线与动态粘弹谱曲线却无明显区别。     

FT-IR spectroscopic study of hydrogen bonding in PA6/clay nanocomposites

Fourier transform infrared spectroscopy was used to investigate PA6/clay nanocomposites (PA6CN) with various cooling histories from the melt, including rapid cooling (water-quenched), middle-rate cooling (air-cooling) and slow cooling (mold-cooling). In contrast to pure PA6 dominated by the α-phase, the addition of clay silicate layers favor the formation of the γ-crystalline phase in PA6CN.We focus on the reason why silicate layers favor the formation of γ-phase in PA6. Vaia et al. suggested that the addition of clay layers forces the amide groups of PA6 out of the plane formed by the chains. This results in conformational changes of the chains, which limits the formation of H-bonded sheets so that the γ-phase is favored. If this assumption is correct, PA6CN is expected to show some differences as compared with PA6 with respect to hydrogen bonding.The silicate layers were indeed found to weaken the hydrogen bonding both in the α- and γ-phases. This was also confirmed by X-ray diffraction studies. The γ-phase is most likely concentrated in regions close to the silicate layers, whereas the α-phase is favored in the bulk matrix.     

PA6/ABS/ABS-g-MAH合金的研究

用自制的增容剂ABS- g -MAH对PA6 /ABS合金进行了改性研究。结果表明:当PA6与ABS二元共混时,力学性能很差;当加入增容剂ABS- g- MAH ( 2 0 % )时,三元合金的力学性能接近于纯PA的力学性能,相态结构分布均匀,同时三元合金的MFR比纯PA6的MFR下降约3倍,克服了纯PA6的流涎现象,热变形温度也比纯PA的提高38℃。     

Microstructures and mechanical properties of polypropylene/polyamide 6/polyethelene-octene elastomer blends

A series of polymer blends were designed and manufactured. They are composed of three phases: polypropylene (PP), polyamide-6 (PA6) and polyethylene-octene elastomer (POE) grafted with maleic anhydride. The weight fraction of PA6 was adjusted from 0 to 40% by increments of 10%, and the weight fraction of POE was systematically half that of PA6. The morphology, essentially made of PA6 particles dispersed in the PP matrix, was characterised by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). In the extruded plates prepared with the blends, the shape of the dispersed PA6 particles showed an elongated ellipsoidal shape, whose aspect ratio increased somehow with alloying content. The POE modifier was observed both as a thin interlayer (less than 100 nm thickness) at the PP/PA6 interface, and as a few isolated particles. The elastic modulus and yield stress in tension are nearly constant for PP and blends. By contrast, the notched Izod impact strength increases very much with alloying content. This remarkable effect is interpreted in terms of POE interphase cavitation, enhanced plastic shear deformation and resistance of PA6 particles to crack propagation.     

PA6/1212共聚物的性能研究

用差示扫描量热仪对尼龙6/1212(PA6/1212)共聚物的一次、二次熔融行为及结晶行为进行了研究,分析了组成与熔融峰、结晶峰的关系,发现了冷结晶现象;研究了PA1212单体含量为2%~20%的PA6/1212共聚物的力学性能与组成的关系。结果表明,在此组成范围内可制得刚性优良的共聚物,冲击强度也有所改善,当PA1212单体含量为11%时,可得到综合力学性能相对较好的共聚物。     

高聚物PA66压力诱导流动成型研究

采用一种新的压力诱导流动成型工艺，将传统熔融加工成型的块状塑料PA66在一定的温度下，压力诱导后像“熔体”一样流动成型。研究了压力诱导成型过程中的温度、压力以及保压时间对PA66力学性能和结构的影响，并对其成型后的结构进行了研究和表征。结果表明，这种压力诱导流动成型方法，形成了特殊的微观片状结构，大大提高了其力学性能，是简单而行之有效的加工方法。     

PP-g-MAH增容PP/PA66共混物的形态结构和性能

用固相接技法制备了马来酸酐接枝改性聚丙烯(PP-g-MAH),研究了PP-g-MAH增容PP/PA66共混物的形态结构和性能。结果表明,未用PP-g-MAH增容的PP/PA66共混物是热力学不相容的海岛型两相结构,而用PP-g-MAH增客的PP/PA66共混物虽是两相结构,但分散相粒子尺寸大大减小,PP-g-MAH对PP/PA66共混物实现了反应性增容。与不含PP-g-MAH的PP/PA66共混物相比,PP-g-MAH增容的PP/PA66共混物的拉伸强度提高约10 MPa,弯曲强度提高约10 MPa,弯曲模量增加10％,缺口冲击强度和伸长率保持不变。