Evaluation of Polyester Resin as a New Compatibilizer for SBR/PVC Blends

A polyester (PE) based on the glycolyzed products of PET was prepared and added in different concentrations to a series of SBR/PVC blends. The addition of the polyester showed that all properties of SBR/PVC blends were improved by incorporation of PE. Highest mechanical strength values were obtained at a polyester concentration of 7.5 phr. Thermal analysis as well as dynamic mechanical properties of SBR/PVC blends after the addition of 7.5 and 10 phr polyester indicated one single glass transition temperature. The dielectric losses (?") were analyzed in the frequency domains in the two terms of Fröhlich related to the Maxwell Wagner effect and the orientation of the aggregates caused by the movement of the main chain. The permittivity (?') values were found to increase by increasing the polyester content. This increase was followed by a decrease in the ?" up to a 7.5 phr polyester content after which no pronounced change was noticed.     

塑料啤酒瓶开发现状

介绍了塑料啤酒瓶的优点,详细介绍了各种以PET为基础的改性啤酒瓶材料,并列举了大量的开发实例。     

Crystal lattice deformation and the mesophase in poly(ethylene terephthalate) uniaxially drawn by solid-state coextrusion

The development of crystalline and mesophase structure on drawing of poly(ethylene terephthalate) (PET) has been studied. The uniaxial drawing has been done by solid-state coextrusion from 50 to 90°C. The unit-cell parameters of stress-induced crystallites in extrudates have been determined as a function of extrusion draw ratio (EDR) up to 4.4 and at an extrusion temperature (ET) above T_g, at 70 and 90°C. The higher the EDR, the longer the c-axis chain direction, the shorter the a and b axes and the smaller the unit-cell volume. In comparison with the conventional lattice parameters obtained by Bunn and Fisher, the highest elongation of the c axis is near 10%. These features imply that the lattice of stress-induced crystallites is far from the closest packing. Coextrudates made below the T_g of PET differ markedly from those made above T_g. Wide-angle X-ray diffraction (WAXD) patterns of PET extruded at 50°C (below T_g) even at high draw ratio exhibit small and/or imperfect crystallites. They appear much as a mesophase. The distance between macromolecular chains ranges from 3.2 to 5.4 Å. The shortest value in the mesophase approaches the interplanar crystal distance of 3.4 Å for the (100) crystal face, on which the benzene rings lie. The crystalline peak separation of the PET, WAXD curve has been evaluated to obtain absolute crystallinities and the content of mesophase and amorphous phase.     

高负荷下聚酯工艺参数的优化

介绍原 2 0万t/a装置增容到 2 4万t/a时的工艺参数优化。PTA平均粒径 95～ 110 μm ,n(EG) /n(PTA) =2 .6～ 2 .7,酯化液位 63 %～ 64 % ,温度 2 92～ 2 96℃ ;乙二醇锑催化剂 ,稳定EG、DEG量 ,选择TiO2 消光剂 ,滤除凝聚粒子 ;预缩聚温度 2 87～ 2 89℃ ,压力 2 .4～ 2 .8kPa,液位 42～ 48cm ;终缩聚温度 2 90～ 2 91℃ ,压力 2 .5～ 3 .0hPa,液位 60～ 62cm ,搅拌速度 2 .7r/min。     

Production of agrochemical from waste polyesters

In this study, agrochemical was produced from waste polyesters. Reactions of waste polyesters [poly (ethylene terephthalate) (PET) and poly (butylene terephthalate) (PBT)] powder with ethylene glycol (EG) in the presence of tetrahydrofurane (THF) using 0.003 mol lead acetate as a catalyst were carried out in a batch reactor at 470 K and at atmospheric pressure conditions. Reactions were undertaken with various particle size ranges from 50 to 512.5 μm, and reaction time from 30 to 70 min for reactions of polyesters. Low molecular weight product of polyester was obtained during this process. In the next stage, hydroxylamine hydrochloride (HAHC), cyclohexylamine (CHA), and potasium hydroxide (KOH) solution were introduced to convert low molecular weight product of polyester into terephthalohydroxamic acid (TPHA) by introduction of HCl (Hydrochloric Acid) as per stoichiometric requirement. TPHA can be used as an agrochemical (insecticide) with appreciable efficiency. To increase the polyester conversion rate, external catalyst (0.003 mol lead acetate) was introduced during the reaction. The product was deposited on the surface of unreacted polyester, which was removed from the surface by introducing dimethyl sulfoxide (DMSO). To accelerate the reaction rate, DMSO, CHA, and THF were introduced during the reaction, which has an industrial significance. Depolymerization of polyester was proportional to the reaction time. Depolymerization of polyester was inversely proportional to the particle size of polyester. Analyses of value‐added product (TPHA) and byproducts [EG and BD (1,4‐butanediol)] as well as polyesters were undertaken. A kinetic model is developed, and experimental data simulated with it, which was consistent with the model. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 2504–2510, 2006     

低速纺制8.3tex三角异形有光PET长丝——Ⅰ.前纺工艺研究

用VC403纺丝机纺制题示纤维。对设备及工艺进行了改进:在切片干燥前加入0.01%的硬酯酸钙,以增加切片的润滑性能;干燥升温阶段放慢升温速率,冷却阶段通入减湿空气。在切片含水率≤0.006%的情况下,纺丝温度应控制比同规格半消光PET高8—12℃;吹风温度为40—50℃,吹风速度0.2—0.3m/s;加强喷丝板保温;改进吹风窗结构及设计水字形喷丝孔形。     

A multi-scale template method for shape detection with bio-medical applications

In this paper we present a novel methodology based on non-parametric deformable prototype templates for reconstructing the outline of a shape from a degraded image. Our method is versatile and fast and has the potential to provide an automatic procedure for classifying pathologies. We test our approach on synthetic and real data from a variety of medical and biological applications. In these studies it is important to reconstruct accurately the shape of the object under investigation from very noisy data. Here we assume that we have some prior knowledge about the object outline represented by a prototype shape. Our procedure deforms this shape by means of non-affine transformations and the contour is reconstructed by minimizing a newly developed objective function that depends on the transformation parameters. We introduce an iterative template deformation procedure in which the scale of the deformation decreases as the algorithm proceeds. We compare our results with those from a Gaussian Mixture Model segmentation and two state-of-the-art Level Set methods. This comparison shows that the proposed procedure performs consistently well on both real and simulated data. As a by-product we develop a new filter that recovers the connectivity of a shape.

CMSs/PET微胶囊阻燃PET纤维制备与表征

将采用原位聚合法自制的核-壳型碳微球(CMSs)/聚对苯二甲酸乙二醇酯(PET)微胶囊(PCMSs)作为阻燃剂,采用熔融纺丝法制备阻燃PCMSs/PET功能纤维。通过扫描电镜、声速仪、强伸仪、极限氧指数仪等测试设备对添加不同质量分数的阻燃剂的阻燃功能纤维的结构及性能进行测试和表征。结果表明:当阻燃剂PCMSs的质量分数为0.6%时,PCMSs在PET纤维基体中的分散性和相容性良好,此时纤维表面较为光滑,同时具有优良的吸湿性能和阻燃性能,但其力学性能稍低于PCMSs质量分数为0.2%时的PCMSs/PET纤维。     

具有保温性能的电纺LA/PET纳米纤维复合织物的制备与表征

本文制备了电纺月桂酸(LA)/聚对苯二甲酸乙二醇酯(PET)纳米纤维/机织物的复合织物,并对其进行了表征.选用纯棉纱线、毛纱线、涤棉纱线、腈纶纱线和涤纶纱线分别作为经纬纱线,在实验室制备机织物小样,同时,通过静电纺丝法制备LA/PET纳米纤维,将LA包裹在PET基材之中.之后通过缝合的方式,将电纺LA/PET纳米纤维和机织物构造成三明治结构的复合织物.对纳米纤维的形貌和热性能进行了表征,并分别探究了LA/PET的质量比,机织物组织结构和机织物材料对复合织物保温性能的影响.结果表明:LA/PET纳米纤维呈圆柱形,具有光滑表面,LA和PET展现出良好的相容性,热焓值略低于理论值,但相变温度改变不大.复合织物的热保温性能测试表明,复合织物的保温性能都优于未加入相变材料的织物,同时展现出良好的热循环稳定性.     

浅谈涤纶FDY生产新技术──TCS一步法的特点

ＴＣＳ系指德国巴马格公司最新推出的细旦涤纶纺丝技术，该技术突破了热辊拉伸这一传统的涤纶纺丝模式，以甬道中的热空气为传热媒体，使丝条在稳定均一的热环境中完成拉伸过程。ＴＣＳ与ＣＷ６超高速卷绕机配合使用，可在极高的纺速下一次形成比较完善的纤维结构，从而获得条干和染色性能优异的成品纤维。该文介绍了该技术的工艺流程、设备结构和产品特点等。