补强剂和共混工艺对PA/PVC/NBR三元共混弹性体性能的影响

在选择三元共聚尼龙（PA）、聚氯乙烯（PVC）、丁腈橡胶（NBR）为主体材料，制备PA／PVC／NBR（10／30／60）三元共混弹性体的工作基础上，进一步探讨了填料品种和用量，共混温度，加料顺序等因素PA／PVC／NBR三元共混弹性体的影响。试验结果表明：在PA／PVC／NBR（10／30／60）共混体系中，补强型填料的补强效果优于非补强型的填料，6种填料补强效果依次是：快压出炭黑＞半补强炭黑＞白炭黑＞活性重质，CaCO3＞陶土＞滑石粉，快压出炭黑的适宜用量是20－50份。在制备PA／PVC／NBR三元共混物时，适宜的共混温度是122－140℃，并且采用二段法混工艺制得的共混物性能优于采用一段法共混工艺。     

PA66／TLCP原位复合材料的热性能、形貌及力学性能研究

通过挤出和注射成型制备了聚酰胺66／热致液晶聚酰胺（PA66／FLCP）原位复合材料，研究了其热性能、形貌及力学性能。DSC分析表明，PA66和TLCP相容性较好，随着TLCP含量的增加，PA66的结晶度、结晶速率下降；SEM分析表明，TLCP在PA66基体中分散均匀，两相相容性较好，当加入10％（质量分数，下同）的TLCP时，TLCP形成长径比比较大的纤维；拉伸试验结果表明，当加入TLCP后，PA66的力学性能有明显的改善。当加入10％的TLCP时，共混物的力学性能增幅最大，拉伸强度增加79．6％，拉伸模量增加120．4％，断裂伸长率明显下降。     

Synthesis and characterization of poly(hexamethylene terephthalate/hexamethylene oxamide) alternating copolyamide (alt-PA6T/62)

As a representative polyoxamide, poly(hexamethylene oxamide) (PA62) has good comprehensive performance. However, the high T_m (330°C) creates an obstacle for processing. To improve the processability of PA62, poly(hexamethylene terephthalate/hexamethylene oxamide) alternating copolyamide (alt-PA6T/62) was synthesized by hexamethylene diamine-terminated 6T6-diamine and dibutyl oxalate via solution/solid state polycondensation. Random copolyamide (ran-PA6T/62) was also synthesized for comparison. The structure and properties of the copolymer were analyzed by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Wide-angle X-ray diffraction (WAXD) and the saturated water absorption test. The NMR results confirm the alternating structure of alt-PA6T/62. The DSC and TGA results demonstrate that the novel alternating copolyamide alt-PA6T/62 (T_m = 321°C, T₅ = 420°C) exhibited better thermal properties than those of ran-PA6T/62 (T_m = 294°C, T₅ = 412°C). The saturated water absorption of alt-PA6T/62 was found to be 3.2 wt%. These results revealed that the novel alt-PA6T/62 had an alternating sequence distribution, showed a high melting point as well as good processability and thermal stability, and possessed low saturated water absorption and excellent dimensional stability.     

混料设计及调优软件在热熔胶配方实验中的应用

根据常规试验方法和混料设计及调优软件指导两种方法分别进行了两种聚酰胺热熔胶的合成实验 ,实验结果说明用混料设计及调优软件指导的试验只用 12次就得到常规试验方法 3 1次得到的结果     

Electrically conductive composite of polyaniline and poly (p-phenylene/diphenyl ether-terephthalamide)

In order to improve the flexibility and the anti-static properties of poly-(p-phenylene-terephthalamide) (PPTA), the copolymer of p-phenylene diamine, p,p′-diaminodiphenyl ether and terephthaloyl chloride (PPDTA) was synthesized. This copolyamide PPDTA was mixed with electrically conductive polyaniline (PAn) in concentrated sulphuric acid solution, and was processed to form film, or fibre, of the new composite PAn/PPDTA with high strength and good electrical conductivity. The composite is a lyotropic liquid crystalline polymer with electrical conductivity 10^?1 S/cm. The surface morphology of the PAn/PPDTA composite consists of an oriented fibre-like texture.     

工艺参数对薄型熔喷纤网均匀性的影响

采用称重法对在添加了辅助装置的熔喷设备上制得的以低熔点共聚酰胺为原料的热熔纤网的均匀性进行了测试。测试结果表明:随挤出量和辅助气流速度的增加纤网的重量不匀率增加;随主喷气流速度和接收距离的增加,纤网的重量不匀率先减后增。     

Synthesis and properties of nylon 6/66/510 used as hot melt adhesives for metal plate with low-surface-energy coating

In this work, nylon 6/66 and nylon 6/66/510 containing 5?～?20?mol % nylon-510 were synthesized to be used as hot melt adhesive for metal plate with low-surface-energy coating. The effects of mole fraction of nylon-510 (X_m) on the thermal and mechanical properties of nylon 6/66/510 were systematically studied. The results demonstrated that: (1) the melting point of the copolyamide decreases and the glass transition temperature decreases when the X_m value increases; (2) the tensile strength of nylon 6/66/510 remains almost unchanged and is almost equal to that of nylon 6/66; (3) the elongation at break of nylon 6/66/510 is significantly higher than that of nylon 6/66. The crystal structure of the copolyamide was also investigated by wide-angle X-ray diffraction (WAXD). The hot-melt adhesives (HMAs) were prepared from nylon 6/66/510, and the adhesive experiments of HMAs to aluminum sheet with low-surface-energy coating were carried out. The results showed that the peeling strength of HMAs based on nylon 6/66/510 reaches a maximum value when X_m = 15?mol %.     

可用于熔喷生产的低熔点共聚酰胺黏度与温度关系的研究

用自制的高温落球黏度计测试两种低熔点共聚酰胺的零切黏度,获得零切黏度与熔体温度的关系,为相应的理论研究打下了基础。从零切黏度的测试结果求出两种原料的黏流活化能。所测试的两种原料中原料2的黏流活化能较小,在同样温降范围内其黏度降也较小,即不容易发生热降解,因此更适合于熔喷生产。     

高抗冲POM／OOPA共混物的研制

研究了原料配比、制样工艺条件对聚甲醛／三元共聚酰胺(POM／COPA)共混物力学性能的影响，并用红外光谱仪、差热分析仪及扫描电镜对共混物中两相间存在的相互作用及共混物的微观形态结构进行了研究。结果表明COPA加入量及制样工艺条件对共混物的冲击强度有较大影响，共混物中POM与COPA分子间存在氢键作用。     

PA6/66/1010三元共聚酰胺流变性能

将PA6/PA66/PA1010按一定的比例混合进行共聚,制得低熔点共聚酰胺。对制得的低熔点共聚酰胺进行流变分析,与PA6的流变曲线进行比较。实验结果表明:共聚物的流变曲线与PA6的相似,都表现出切力变稀的行为。与PA6相比,共聚物的流变曲线表现出更明显的切力变稀行为。在同样的高出熔点45℃的条件下,在同样的剪切速率下,共聚物表现出更大的表观粘度。