Replication of liner collapse phenomenon observed in hyperbaric type IV hydrogen storage vessel by explosive decompression experiments

An experimental design based on representative sample is described in order to reproduce the detachment and deformation of the inner polymer layer (called liner) of hyperbaric hydrogen storage vessels during the emptying step. It is the first step of a better understanding of the mechanisms involved in the creation of a liner collapse. Results showed that a hydraulic testing machine fitted with a pressure hydrogen chamber enables to create a liner collapse on small samples by explosive decompression experiments. Tomographic observations have revealed that the collapse appears at the polymer liner/composite interface in areas that are not sufficiently bonded, nor consistently. Determination of liner collapse amplitudes, assessed by tomography, has underlined that, under some specific conditions, the deformation of the liner is permanent even when hydrogen has completely desorbed from the sample. In addition to liner collapses, composite cracks were also highlighted.     

锦纶莱卡包覆纱拉伸性能与包覆度的关系

用一定规格的锦纶丝、莱卡长丝在空心锭纺纱机上纺制了一系列不同包覆度的锦纶莱卡包覆纱,并对其成纱性能进行了拉伸试验分析,得到了包覆纱断裂强力、断裂伸长率与包覆度之间的相应规律.     

成核剂和乙烯马来酸酐共聚物混杂改性玻璃纤维增强聚酰胺复合材料

利用静电吸附方法制备了成核剂(P22)和乙烯马来酸酐共聚物(EMA)混杂改性的玻璃纤维(GF)增强体,并通过挤出成型制备了聚酰胺66(PA66)/改性GF增强体复合材料。采用扫描电子显微镜观察复合材料断面和刻蚀后断面。结果表明,P22吸附在GF表面可以诱导PA66在GF表面结晶,而EMA分子中的酸酐基团则可以与PA66分子链末端的氨基发生反应,使PA66附着在GF表面,改善了GF与基体的界面结合;良好的界面结合使PA66/GF-P22 、PA66/GF-EMA、PA66/GF-EMA-P22复合材料的层间剪切强度和动态储能模量(室温25 ℃)分别提高了18.3 %、25.4 %、32.4 %和15.4 %、24.1 %、35.9 %。     

涤锦超细纤维碱性染色研究

采用HG-3、磷酸二氢铵、AD-95三种助剂,对涤锦复合超细纤维染色作应用研究。通过对染物K/S值、表面色泽均匀度S值染色牢度的测试,认为HG-3是分散染料碱性染色的优良助剂。     

人丝/锦纶花色纱一浴法染色工艺的探讨

在对人造丝和锦纶两种纤维形态结构及染色性能分析的基础上,从染料、助剂及染浴条件等方面阐述了一浴两步法染色工艺的可行性,并给出具体染色工艺。     

尼龙织物圆网印花技术

从制版、配浆、印花、汽蒸和水洗固色后处理等方面,详细介绍尼龙织物圆网印花生产的工艺配方和操作技术特点,并对生产中常见的疵点进行分析,提出相应的解决措施。     

锦棉弹力闪光织物的染整工艺

锦棉弹力闪光交织物经向为棉纶有光丝,纬向为棉氨纶包芯纱。前处理前应先经预定形,以减少皱印;采用冷轧堆前处理、中性/直接混纺染料或活性染料一浴法染沟;定形温度不宜高,或两次定形。整个染整加工宜采用松式或低张力工艺,以确可产品的质量和风格。     

特达~在户外运动服中的运用

特达 ○R纤维是尼龙 6 6的改良产品 ,是通过异形、复合、混纤、变形等纺丝技术开发的差别化产品。不仅改善了尼龙的性能 ,而且赋予尼龙更好的功能。特达 ○R具有良好的强度和韧性、优良的耐磨性、弹性回复性以及染色性能 ,是用于户外运动服的好面料。     

In—situ Composite Based on Poly （ethylene terephthalate）,Polyamide and Polyethylene with Microfibres Formed through Extrusion and Hot Stretching

In-situ composites based on dispersed poly (ethylene terephthalate) (PET) or polyamide (PA),and continuous Polyethylene (PE) were prepared through a single screw extruder of Haake rheometer system with a rod-die relatively small in diameter.The extrudate was drawn at a drawing ratio of 3.1,and then quickly cooled in cold water.The specimens were obtained by injection molding at processing temperatures less than 190℃,far below the melting temperature of PET (265℃) and PA (230℃),which can maintain the solid state of PET and PA microfiber phase in the composites.Morphological observation with scanning electron microscopy (SEM) indicated that PET and PA can more or less form in-situ microfibers at compositions studied (0-20 wt pct PET or PA),and especially,PET and PA were almost deformed into fibers at the concentration of 15wt pct.Eensile strength and especially.PET and PA were almost deformed into fibers at the concentration of 15wt pct.Tensile strength and modulus of the blends reinforced by PET or PA microfibers showed to be increased from the tensile test results.The most noticeable improvement of the tensile properties occurred at 15wt pct of PET in PET/PE system,corresponding to the highest microfiber content,where the tensile strength reached 32.5 MPa,whereas only 19.5 MPa for the pure PE.     

R型及KE型活性染料在锦／棉染色中的应用

R型／中性－浴染色可将染色时间从原来的10h缩短为4－5h,修色可降温后直接加料。由于中性条件固色,避免碱性条件下的锦纶手感损伤。KE型活性染料染色后,在染锦纶时pH值不可太低,以6－7为宜,避免酸性条件下染料－纤维键断裂。