聚对苯二甲酸乙二酯的生产及应用

本文介绍了聚对苯二甲酸乙二酯的直接酯化的生产方法、应用领域及市场需求等情况。     

聚酯类共混改性聚对苯二甲酸丁二醇酯

讨论了聚碳酸酯(PC)、聚对苯二甲酸乙二醇酯(PET)以及聚苯二甲酸三甲酯(PTT)共混改性聚对苯二甲酸丁二醇酯(PBT)的研究进展。聚酯之间具有较好的相容性。通过添加其它聚酯弥补了PBT的一些缺点，从而拓宽了PBT的应用领域。     

聚对苯二甲酸丁二酯/聚丙烯皮芯复合驱蚊纤维

利用扫描电子显微镜观察聚对苯二甲酸丁二酯/聚丙烯皮芯复合驱蚊纤维的形态结构,并用单纤强力仪测试纤维的力学性能。研究发现:复合纤维表面平滑;当纤维中驱蚊剂质量分数低于6%时,纤维截面具有规整的同心圆结构,且皮芯结合紧密,纤维的断裂强度为2.5 cN/dtex,断裂伸长率为35%左右,力学性能良好;而当驱蚊剂质量分数高于8%后则出现皮芯分离现象,且此现象随着驱蚊剂含量的增高而愈发明显,力学性能随之下降。     

聚对苯二甲酸乙二酯的固态缩聚反应研究

测定了聚对茉二甲酸乙二酯固态缩聚反应动力学有关参数，表明反应级数ｎ＝１．５－１．８，活化能为３１．４ｋＪ／ｍｏｌ，同时基于本研究结果，说明缩聚反应发生在非晶区（液相），而不是在晶区（固相），所以称固厢缩聚是不准确的。     

聚对苯二甲酸丁二酯结构与性能研究进展

综述了关于聚对苯二甲酸丁二酯结构与性能研究的一些结果，以及这些结果对理论和其应用的意义。同时．简介了如何结合其结构和性能进行改性．开拓应用等问题。     

木质素与聚对苯二甲酸丁二酯的共混及相容性研究

利用微型双螺杆共混仪研究了木质素与聚对苯二甲酸丁二酯的共混过程。热力学分析和红外光谱分析表明:木质素与聚对苯二甲酸丁二酯共混体系有较好的相容性,主要原因是木质素与聚对苯二甲酸丁二酯间有强的氢键形成。     

3D打印用聚对苯二甲酸乙二醇酯的研究

选用聚对苯二甲酸乙二醇酯(PET)作为基体材料,通过添加聚对苯二甲酸丁二醇酯(PBT)、相容剂、增韧剂和成核剂制得适用于熔融沉积技术的PET丝材.结果表明,当PET:PBT为7:3时,熔体流动速率最低;过多相容剂在螺杆进料口架桥,不利于螺杆挤出;当增韧剂含量为15份(质量份,下同)时,材料能够正常打印,样条无翘曲且表面...     

聚对苯二甲酸乙二醇酯合成基本原理Ⅱ.聚对苯二甲酸乙二醇酯的合成

概述了聚对苯二甲酸乙二醇酯(PET)合成的基本原理,以及由对苯二甲酸乙二醇酯(BHET)单体经缩聚反应合成PET的反应机理、合成过程中的主要化学反应,详述了BHET缩聚合成PET的主要影响因素。由BHET缩聚合成PET属于逐步缩合聚合过程,缩聚过程中存在多个化学反应,包括链增长反应、链降解反应及网状结构凝胶物生成的副反应。BHET缩聚合成PET的影响因素主要有催化剂种类及其用量、稳定剂种类及其用量、反应温度、反应釜余压及物料的液层厚度等。今后,在PET及其共聚酯的合成中,应加大无毒催化剂的使用与推广、非石油基原料的开发及化学改性共聚酯的开发,以及废旧聚酯的化学法回收再生利用。     

聚对苯二甲酸乙二醇酯合成催化剂研究进展

探讨了各类锑系催化剂、钛系催化剂(包括乙二醇钛)等不同类型的催化剂在聚酯缩聚反应中的催化性能研究的最新成果,指出在各种类型催化剂中,由于具有作为催化剂时不会带入多余的杂质进入反应体系等优点,乙二醇锑和乙二醇钛的应用前景较为广阔。     

聚对苯二甲酸乙二酯生产技术进展

阐述了PET的发展现状，着重介绍了一种新的聚酯生产工艺－－杜邦NG3工艺。此外还介绍了2种新的高效环保型催化剂。     

Rheological behavior of polyester blend and mechanical properties of the polypropylene–polyester blend fibers

The article deals with method of preparation, rheological properties, phase structure, and morphology of binary blend of poly(ethylene terephthalate) (PET)/poly(butylene terephthalate) (PBT) and ternary blends of polypropylene (PP)/(PET/PBT). The ternary blend of PET/PBT (PES) containing 30 wt % of PP is used as a final polymer additive (FPA) for blending with PP and subsequent spinning. In addition commercial montane (polyester) wax Licowax E (LiE) was used as a compatibilizer for spinning process enhancement. The PP/PES blend fibers containing 8 wt % of polyester as dispersed phase were prepared in a two‐step procedure: preparation of FPA using laboratory twin‐screw extruder and spinning of the PP/PES blend fibers after blending PP and FPA, using a laboratory spinning equipment. DSC analysis was used for investigation of the phase structure of the PES components and selected blends. Finally, the mechanical properties of the blend fibers were analyzed. It has been found that viscosity of the PET/PBT blends is strongly influenced by the presence of the major component. In addition, the major component suppresses crystallinity of the minor component phase up to a concentration of 30 wt %. PBT as major component in dispersed PES phase increases viscosity of the PET/PBT blend melts and increases the tensile strength of the PP/PES blend fibers. The impact of the compatibilizer on the uniformity of phase dispersion of PP/PES blend fibers was demonstrated. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4222–4227, 2006     

PTT/PP-g-MAH/PP共混材料形态和流变性能研究

以毛细管流变仪和扫描电子显微镜研究了聚对苯二甲酸丙二醇酯(PTT)/聚丙烯接枝马来酸酐(PP-g-MAH)/聚丙烯(PP)共混体系的形态和流变行为。讨论了共混物的组成、增容剂含量对共混物的形态、熔体流变行为的影响。结果表明:PP-g-MAH改善了PP与PTT的相容性,PP在PTT连续相中分散均匀,分散相尺寸随着增容剂含量的增加而减小。共混物熔体为假塑性流体,其非牛顿指数n、熔体黏度、黏流活化能随增容剂含量的增加而降低。     

Influence of Interfacial Activity and Micelle Formation on Rheological Behavior and Microstructure of Reactively Compatibilized PP/PET Blends

Dynamic and start‐up shear flow experiments along with SEM analysis are described for a PP/PET blend compatibilized by two reactive compatibilizers with different interfacial activity and rheological characteristics. The linear viscoelastic behavior of the blends is discussed using Palierne and fractional Zener models (FZMs). The nonzero value of G_e, the elastic modulus of spring element of FZM, is explained by the network‐like structure of the blends attributed to the interconnectivity between dispersed‐phase domains. G_e increases with increasing interfacial activity. Micelle formation due to extra amounts of compatibilizer in a system with higher interfacial activity leads to an increase of the elastic modulus, but to G_e = 0 in system with lower interfacial activity.

     

微孔发泡PP/PET/CNTs复合材料的制备及其电磁屏蔽效能研究

采用聚丙烯(PP)、聚对苯二甲酸乙二醇酯(PET)、碳纳米管(CNTs)制备了具有纤维结构的微孔发泡复合材料,借助层叠器内部流道的变化,实现了造粒阶段PET的连续化原位成纤.通过差示扫描量热仪(DSC)、扫描电子显微镜(SEM)、矢量网络分析仪和万能试验机对复合材料的结晶性能、表观形态、电磁屏蔽效能(EMI SE)和拉...     

Mechanical and dielectric breakdown properties of PBT/TPE,PBT/PBT/PET,and PBT/antioxidant blends

To improve the thermal aging flexibility of poly(butylene terephthalate) (PBT), PBT was melt‐blended with three type thermoplastic elastomer [poly ether‐ester type (TPE1), polyester‐ester type (TPE2), and poly(buthylene 2,6‐naphthalate)/poly(tetramethylene glycol) block copolymer type (TPE3)], PBT/poly(ethylene terephthalate), (PET) alloy (Alloy), and phosphate type antioxidant (T1). The content of the three type TPEs and Alloy was fixed at 20 parts per 100 g of PBT. The morphology and thermal behavior of these blends have been investigated with scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermogravimetry (TG). In the case of PBT/Alloy‐20 and PBT/TPE3–20 blends show clean fractured surface, whereas for PBT/TPE1–20 and PBT/TPE2–20 blends, the elongated pieces or fiber can be seen abundantly which indicates a good compatibility. TG traces show a significant shift of the weight loss toward higher temperature for PBT/Alloy‐20, whereas PBT/TPE1–20, PBT/TPE2–20 and PBT/TPE3–20 blend decrease in thermal stability than PBT. To investigate the applicability for insulation material, the prepared blend samples were extruded an electric wire and flexibility and electric breakdown voltage (BDV) of wire after thermal aging were studied. For PBT/TPE1–20 and PBT/TPE2–20 blends did not show any cracks after flexibility test at 130°C for 6 h and 225°C for 30 min. In contrast PBT, PBT/Alloy‐20, PBT/TPE3–20, and PBT/T1–1 showed a partial crack in the insulation after flexibility test at 130°C for 6 h although its good flexibility at 225°C for 30 min. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

螺杆组合对PP/PET共混体系混合效果影响的研究

对啮合同向双螺杆挤出机捏合块的2种组合进行了流场模拟和统计学分析。通过对2种组合在不同转速下的模拟,计算了流道内停留时间分布、最大剪切速率分布以及累积应变分布,并对分析结果进行了分析和实验研究。结果表明,分散型构型获得的聚丙烯/聚对苯二甲酸乙二醇酯（PP/PET）共混体系的拉伸强度较好;PP/PET共混体系中PET粒径大小影响冲击强度,PET粒径过小会降低冲击强度。     

PET/EVA共混物的制备及其流变性能研究

以PTE和EVA为原料 ,用带有静态混合器的螺杆挤出机制备了PET/EVA共混物 ,并对其流变性进行研究。结果表明 :在所研究的温度和剪切速率范围内 ,PET/EVA流体属于假塑性流体 ,且随着EVA含量的增加 ,共混物流体的黏度增大     

PP/PET/MFIAA/HET原位成纤复合材料的力学性能与熔体流动性

研究了聚对苯二甲酸乙二醇酯（PET）含量、基体性质、成型加工温度对橡纤混杂型PP/PET/多功能界面活化剂（MFIAA）/高效增韧剂（HET）原位成纤复合材料力学性能和熔体流动性的影响。结果表明,MFC、HET用量不变,PET含量增大,微纤的数量增加,长径比增大,复合材料的刚性提高,韧性有所降低;基体PP的熔体流动速率增大,有利于PET微纤在制品中的保持,基体熔体流动速率为16.2 g/10min时,复合材料的缺口冲击强度、拉伸强度和弯曲模量分别达到原料PP的3.49倍、99 %和1.73倍,韧性显著提高的同时刚性保持率也很高;受熔体流动性和分散相形态的双重控制,PP/PET/MFIAA/HET较为适宜的成型加工温度为（200±10） ℃。PET微纤是造成PP/PET/MFIAA/HET流动阻抗增加的主要原因,随着PET含量的增大,复合材料的熔体流动性急剧降低。     

Properties of PP/PET bicomponent melt blown microfiber nonwovens after heat‐treatment

Polypropylene (PP)/poly(ethylene terephthalate) (PET) bicomponent (bico) fibres are successfully melt blown in the Reicofil® meltblown (MB) pilot line commissioned at the Textiles and Nonwovens Development Center (TANDEC), the University of Tennessee, Knoxville. The bico fibers possess a cross‐sectional side‐by‐side configuration. The originally expected greater fiber crimp due to density and fine structure gradients on the different sides of the bico fibers was not commonly observed in the normal MB webs. These fabrics were exposed to dry heat for a period of time. The properties before and after the heat treatment were determined and compared to investigate the effects of heat on their properties. It was found that the bico webs are thermal dimensionally stable and many of their properties were not significantly affected. A mechanism is suggested on the thermal dimensional stability of the PP/PET bico MB webs. © 2003 Society of Chemical Industry