PTT纬编麂皮绒织物的开发及性能研究

PTT纤维作为一种新型原料被应用到纬编麂皮绒织物开发中，文章还对其部分性能进行研究，显示了PTT织物的优异拉伸性能和弹性。     

聚对苯二甲酸丙二醇酯的聚合研究及国产化设想

论述了聚对苯二甲酸丙二醇酯(PTT)的聚合工艺、催化体系、性能表征,并就目前国内存在的问题,提出了实现其产业化的建议。     

Physical characteristics and morphologies of PTT/m-iPP bi-component filaments of the island-in-sea type

The work discusses preparation, structure and selected properties of two special filaments based on poly(trimethylene terephthalate) (PTT) and metallocene isotactic polypropylene (m-iPP) bi-component filaments of the island-in-sea type. PTT microfilaments are formed by removing m-iPP from PTT (island)/m-iPP (sea) conjugated filaments. m-iPP exhaust dyeable filaments are produced from m-iPP (island)/PTT (sea) conjugated filaments. This study thoroughly investigates the physical characteristics and morphologies of PTT/m-iPP bi-component filaments of the island-in-sea type. The dye exhaustions of the fabrics made of PTT series filaments are compared. Experimental DSC results indicated that PTT and m-iPP crystallites formed an immiscible system. The tenacity of the PTT/m-iPP (and m-iPP/PTT) conjugated filaments initially declined and then increased as the proportion of m-iPP (and PTT) increased. Clearly, the 50/50 weight ratio PTT/m-iPP had the lowest tenacity. The experimental crystallinities revealed that PTT and m-iPP crystallites easily formed individual domains, indicating that PTT and m-iPP together constituted an immiscible system. On the morphology, the blends were had a dispersed phase structure. PTT and m-iPP polymers were immiscible. In this investigation, PTT microfilaments were produced and a large size from 2.3 to 2.6 μm in diameter was clearly observed. m-iPP exhaust dyeable filaments were also prepared. The dye exhaustions of various fabrics followed the order, m-iPP exhaust dyeable filaments, conventional PTT filaments, PTT microfilaments respectively.     

氮对高强度耐候钢钒析出行为的影响

在普通耐候钢的基础上采用单独添加或复合添加微合金元素的方法生产高强度耐候钢,并结合攀枝花现有资源特点,针对性地进行了不同氮含量含钒高强度耐候钢的研究。采用Glbeele-3500热模拟试验机、相分析等方法,研究了含钒高强度耐候钢在不同变形程度及变形温度条件下的钒析出-温度-时间关系(PTT曲线),探讨了氮含量、变形量对钒析出行为的影响。试验表明,试验钢的PTT曲线为典型的C曲线形状,在一定的奥氏体化条件下,钒析出过程存在所需时间最短的析出温度;增加氮含量会使PTT曲线明显向左移动;增加变形量可以加快V(C,N)在奥氏体中的析出过程,使PTT曲线向左移动;变形量越大,析出开始时间越短。通过研究,为进一步产品开发提供了技术支持。     

基于语音识别的地震现场对讲通信技术优化研究

当下,地震应急救援时使用对讲机通话是必不可少的通信方式。但救援人员通话时,必然要用手按住PTT才行,这就影响救援人员工作时便利性。基于此,研究采用最新数字运算处理技术以及编入了只识别人类声音的算法,使得外界声音和冲击等不被识别。当救援人员讲话时,自动识别产生PTT,就可以实现通话。救援人员的双手给彻底解放出来,讲话时对讲机自动发射,这对于通信方法优化,提高救援效率,都是有重大益处的。     

PTT/羊毛混纺织物的生产加工

为了充分发挥PTT/羊毛纤维混纺织物中二种纤维的特长,原料选择时,PTT纤维长度与羊毛纤维接近但略长,细度与羊毛纤维接近但略细,以增强毛型感,改善起毛起球。文中对纺纱、织造、后整理工艺等方面详述了具体的工艺参数,并指出生产过程中的相关注意事项。     

Research progress on polymer-inorganic thermoelectric nanocomposite materials

A thermoelectric (TE) material is a material where a potential difference is generated as a result of a temperature difference or the corollary of this where a temperature difference is generated when a voltage is applied. These phenomena can be used to generate electricity and/or control temperature. Traditionally, thermoelectric materials are inorganic semiconductors which have been limited in their application by low efficiency and high cost. Since the 1990s, both theoretical and experimental studies have shown that low-dimensional TE materials, such as superlattices and nanowires, can enhance the value of the TE figure of merit (ZT) which is an indicator of TE thermodynamic efficiency. To date it has not been feasible to apply these materials in large-scale energy-conversion processes because of limitations in both their heat transfer efficiency and cost. When compared to inorganic materials, organic conducting polymers possess some unique features, such as low density, low cost, low thermal conductivity, easy synthesis and versatile processability and their use in preparing polymer-inorganic TE nanocomposites appears to have great potential for producing relatively low cost and high-performance TE materials. Recently, an increasing number of studies have reported on polymeric and polymer-inorganic TE nanocomposite materials. The purpose of this paper is to review the research progress on the conducting polymers and their corresponding TE nanocomposites. Its main focus is the TE nanocomposites based on conducting polymers such as polyaniline (PANI), polythiophene (PTH), poly (3, 4-ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT:PSS), as well as other polymers such as polyacetylene (PA), polypyrrole (PPY), polycarbazoles (PC) and polyphenylenevinylene (PPV). Typically, polymer-inorganic TE nanocomposites are produced by physical mixing, solution mixing and in situ polymerization. The key factors that limit the use of these polymers and their polymer-inorganic TE nanocomposites as TE materials are their low ZT values. More recent developments designed to overcome the limitation including, for example, the use of carbon nanotubes and graphenes and the use of computational modelling to accelerate the selection of suitable pairs of conductive polymer and inorganic TE materials to achieve best possible nanocomposites are reviewed.     

A finite piece method for simulating polymer melt flows in extrusion sheet dies

A finite piece method is proposed to simulate three‐dimensional slit flows in extrusion sheet dies in this paper. The simulations concern incompressible fluids obeying different constitutive equations: generalized Newtonian (Carreau‐Yasuda law), and viscoelastic Phan‐Thien Tanner (PTT) models. Numerical simulations are carried out for the isothermal and nonisothermal flows of polymer melt through sheet dies. The Picard iteration method is utilized to solve nonlinear equations. The results of the finite piece method are compared with the three‐dimensional (3D) finite element method (FEM) simulation and experiments. At the die exit, the relative error of the volumetric flow between the finite piece method and the 3D FEM is below 1.2%. The discrepancy of the pressure distributions does not exceed 6%. The Maximum error of the uniformity index between the simulations and experiments is about 2.3%. It shows that the solution accuracy of the finite piece method is excellent, and a substantial amount of computing time and memory requirement can be saved. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

大豆/PTT分散/中性固色活性染料一浴一步法染色

探讨了染色温度、pH值、元明粉用量和染料用量对分散蓝2BLN与中性固色活性染料Argazol蓝NF-BG对大豆/PTT混纺织物一浴一步法染色后染色织物的表观色深K/S值的影响,测定了不同染料对染色织物牢度的影响。结果表明：当中性固色活性染料NF1.2%omf,分散蓝2BLN0.4%omf,染色pH为7,元明粉用量为50...