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...     

聚萘二甲酸乙二醇酯的开发与应用

介绍了聚萘二甲酸乙二醇酯 (PEN)的性能、制造方法及其PEN制品的特性与用途 ,并与PET树脂进行了比较 ,展示了PEN良好的应用前景     

废聚对苯二甲酸乙二醇酯的醇解研究

研究了醇解条件对废聚对苯二甲酸乙二醇酯(PET)醇解过程的影响,并通过凝胶渗透色谱、差示扫描量热、红外光谱、紫外分光光度仪、黏度计等多种测试手段对醇解产物进行了表征。研究表明:随着反应时间的增加,固相的数均相对分子质量、结晶度先增加后下降;醇解液的特性黏度[η]增加,紫外光透过率下降。固相完全消失后继续延长反应时间,醇解液的[η]变化不大。在实验条件下,多元醇醇解废PET的反应活性大小顺序为乙二醇>丙二醇>甘油。     

聚萘二酸乙二醇酯及其共聚物的合成

采用直接酯化法,通过2,6-萘二酸和对苯二甲酸按一定比例混合,与乙二醇在有水存在的条件下反应,经缩聚制成性能良好的PEN与PET混合的阻隔性包装材料,达到既保持良好性能,又降低成本的目的。反应一开始就存在于系统中的水和催化剂能够最大限度的抑制副产物二甘醇醚键骨架（NDA—DEG）的产生,提高产品纯度。     

光敏聚对苯二甲酸乙二酯材料制备及性能

以聚对苯二甲酸乙二酯(PET)为基材,通过有机-无机原位反应法将改性后的CaCO3基质稀土光敏离子(CaCO3:Eu3+-G)引入,制备出具有高效发光防伪功效的PET复合膜和纤维.采用扫描电子显微镜、激光粒度分析仪、X射线衍射仪、荧光分光光度计、原子力显微镜等对样品的表观形貌和性能进行了表征、测试,结果表明:光敏粒子平...     

β-二酮铝和β-二酮酯铝催化合成聚对苯二甲酸乙二醇酯

采用对苯二甲酸(TPA)和乙二醇(EG)为原料,以自制的β-二酮铝和β-二酮酯铝为催化剂经酯化、缩聚,制得聚对苯二甲酸乙二醇酯(PET).探讨了反应条件对合成反应的影响.结果表明:β-二酮酯铝和乙酰丙酮铝优于其他β-二酮铝.EG与TPA的摩尔比为1.2∶1、催化剂的用量为0.5%(与TPA的摩尔比),酯化反应温度为26...     

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。     

生物可降解聚丁二酸乙二醇酯的合成与降解性能研究

以丁二酸和乙二醇为原料,直接熔融聚合,合成了高相对分子量的聚丁二酸乙二醇酯(PES),用FTIR,1H-NMR表征其结构;考察了不同聚酯反应催化剂对其聚合反应的影响,结果表明:三氧化二锑的催化效果是最佳的。同时,利用酶降解和体外水解的方法,对聚合物降解性能进行研究,结果表明:PES是一种可生物降解的聚合物,且在体外具有一定的降解性。     

聚(对苯二甲酸乙二醇酯-co-对苯二甲酸异山梨醇酯)等温结晶行为研究

以对苯二甲酸(PTA)、乙二醇(EG)、异山梨醇(ISB)为原料,通过直接熔融缩聚法合成聚(对苯二甲酸乙二醇酯-co-对苯二甲酸异山梨醇酯)(PEIT)共聚酯。利用差示扫描量热法(DSC)研究了共聚酯的结晶行为,采用Avrami方程分析了共聚酯的等温结晶动力学。结果表明,PEIT共聚酯结晶行为受共聚组成和结晶温度影响。随着ISB用量的增加或结晶温度的降低,共聚酯半结晶周期t1/2增加、结晶速率变慢;ISB摩尔分数超过20%,共聚酯无法结晶。     

二甘醇二苯甲酸酯的催化合成研究

以苯甲酸和二甘醇为原料,二(乙酰丙酮基)钛酸二丁酯为催化剂,通过酯化合成二甘醇二苯甲酸酯(DEDB),探索了增塑剂DEDB的最佳合成工艺条件,并通过FT-IR、核磁共振氢谱(1H-NMR)对合成产物进行了结构分析。研究结果表明:反应原料酸醇摩尔比为2∶1.1、带水剂用量为苯甲酸质量含量的18%、催化剂用量为苯甲酸质量含量的3.0%,反应温度为180℃,反应时间为5h,酯化率达到98.2%。     

Preparation,characterization, and properties of silicate/polyurethaneurea composites based on dipropylene glycol dibenzoate

The silicate/polyurethaneurea composites based on dipropylene glycol dibenzoate were prepared via a room‐temperature‐cured process. Characterization of the composites was accomplished using scanning electron microscope, X‐ray diffraction, Fourier transformation infrared spectrum, and Raman spectroscopy, and the mechanism, mechanical properties and stability were discussed in detail. The obtained results indicated that a durable silicate/polyurethaneurea composite with inorganic‐organic network structure had been successfully prepared. The composites were thermally stable below 210°C and the compressive and flexural strength of the material could reach 42.6 and 29.2 MPa after curing for 6 h, respectively. POLYM. COMPOS., 37–43, 2016. © 2014 Society of Plastics Engineers     

一缩二乙二醇双苯甲酸酯合成研究进展

介绍了增塑剂一缩二乙二醇双苯甲酸酯(DEDB)的合成方法及其研究进展,指出了其今后的发展方向。     

Influence of the glycol component in dibenzoate plasticizers on the properties of plasticized PVC films

A series of glycol dibenzoates was synthesized by transesterification of glycols with methyl benzoate. PVC films were prepared from suspension grade PVC and the dibenzoates at a constant content of the dibenzoates. The mechanical properties of the films were measured. In addition, the extractability and the absorption of various liquids was determined. The effect of the structure of the glycol component in the dibenzoates on the mechanical properties of the films and the plasticizing efficiency was investigated. Neopentyl glycol dibenzoate exhibits the highest plasticizing effect, followed by triethylene and ethylene glycol dibenzoates and the 2‐(n‐butyl)‐2‐ethyl‐1,3‐propanediol derivative. It was found that the ether linkages in the dibenzoates mainly contribute to the plasticization of PVC. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 822–824, 2005     

乙二醇单叔丁醚与乙二醇二叔丁醚的分离

在实验测定乙二醇单叔丁醚(TMBE)与乙二醇二叔丁醚(TDBE)相平衡数据的基础上,回归得到了Wilson方程的相互作用参数Λ12和Λ21,并利用回归参数的Wilson方程预测了TMBE和TDBE共沸组成随压力降低,TMBE的摩尔分数降低。根据此特性,文中设计了利用差压精馏分离TMBE和TDBE的流程,并在Pro/II流程模拟软件上,建立了差压精馏分离TMBE和TDBE的模型并进行了模拟计算。模拟结果表明:利用差压精馏可分别获得纯度(摩尔分数)大于99%以上的TMBE和TDBE。     

乙二醇对聚氨酯微孔弹性体工艺及性能的影响

聚氨酯微孔弹性体,由高活性聚醚多元醇、多异氰酸酯、醇类扩链剂、催化剂等高速混合,一次浇注成型,考察乙二醇用量对聚氨酯微孔弹性体工艺及性能的影响。结果表明,随着扩链剂乙二醇量的增加,聚合反应体系乳白时间和凝胶时间逐渐缩短,聚氨酯微孔弹性体材料密度略有增加,拉伸强度和硬度明显提高,断裂伸长率明显下降。     

Heterogeneous photocatalytic degradation of ethylene glycol and propylene glycol

The photocatalytic decomposition of ethylene glycol and propylene glycol was investigated by using UV-illuminated TiO₂ and metal-loaded TiO₂ catalysts. The effects of pH, initial concentration, and wavelength of light on the decomposition rate of the glycols were explored. Platinum-and palladium-loaded TiO₂ catalysts enhanced the rates of photodecomposition compared to unloaded TiO₂. The glycols were oxidized primarily to carbon dioxide and water. Formaldehyde was found to be an important reaction intermediate. A detailed chemical reaction mechanism for the destruction of ethylene glycol and propylene glycol in water via free radical pathway and trapped hole reactions at the particle surface is proposed.     

环氧乙烷/乙二醇生产技术进展

综述了传统石油路线乙烯氧化制环氧乙烷/乙二醇的技术进展,分析了不同类型银催化剂的技术特点、工业应用情况和发展趋势;研究了环氧乙烷生产工艺技术的主要进展,包括高选择性银催化剂在运行初期和老化阶段的配套开车技术,简化环氧乙烷吸收和解析工段流程、提高环氧乙烷纯度、减轻设备腐蚀的技术,催化水合技术,乙二醇产品精制技术和新型乙烯氧化反应器。概述了煤经合成气制乙二醇的技术开发、工业应用情况和存在的问题,提出了我国环氧乙烷/乙二醇银催化剂开发、成套工艺技术开发和煤制乙二醇产业发展的建议。     

Pressure-volume-temperature properties for binary and ternary polymer solutions of poly(ethylene glycol), poly(propylene glycol), and poly(ethylene glycol methyl ether) with anisole

Pressure-volume-temperature properties were measured for polymer solutions of poly(propylene glycol) (PPG)+anisole, polymer blends of PPG+poly(ethylene glycol methyl ether) (PEGME), and the blends of PPG+PEGME and poly(ethylene glycol) (PEG)+PPG with anisole at temperatures from 298.15 to 348.15 K and pressures up to 50 MPa. The Tait equation represents accurately the pressure effect on the liquid densities over the entire pressure range. The excess volumes change from positive to negative as increasing the mole fraction of PPG in the binary systems of PPG+anisole and PPG+PEGME. The volumetric data of the related binary systems were correlated with the Flory-Orwoll-Vrij and the Schotte equations of state to determine the binary parameters. By using these determined binary parameters, both equations predicted the specific volumes of the polymer blends with anisole to average absolute deviations of better than 0.13%.