PET薄膜表面改性研究进展

综述近年来聚对苯二甲酸乙二酯(PET)薄膜表面改性的研究进展,主要介绍了机械处理、化学处理、表面改性剂处理、火焰处理、等离子体处理、表面接枝、表面涂覆等方法对PET薄膜表面的改性,并对PET薄膜表面改性研究方向进行了展望。     

PET薄膜表面性能及其与紫外光固化涂层粘接性能相关性研究

通过粘结性能实验研究了表面处理方法对PET薄膜/紫外光固化涂层体系粘接性能的影响,结果表明:表面处理提高了PET薄膜/涂层体系粘接强度。研究了PET表面处理对PET表面性能如表面形貌、光泽度(粗糙度)、表面张力、表面官能团含量的影响,结果表明:PET薄膜经电晕处理后,其表面粗糙度有增大的倾向,而涂层处理对PET薄膜表面粗糙度无影响;经电晕处理和底涂处理后,PET薄膜表面张力均有增加,底涂处理提高PET薄膜表面张力的幅度更大。研究了PET薄膜表面性能与剪切强度的关系,发现PET薄膜/涂层粘接体系剪切强度τ与PET薄膜表面张力γ具有线性关系。     

改性纳米SiO_2及其树脂基复合材料的性能研究

对纳米SiO_2连续进行两步法改性,首先接枝PEG400,然后共聚自制低分子量PET,采用NMR、热失重仪、X射线光电子扫描仪对其结构进行了表征。采用熔融混合法分别制备了未改性纳米SiO_2、两种改性纳米SiO_2、低分子量PET与PET树脂的复合材料,利用SEM、毛细管流变仪对复合材料的性能进行了研究。结果表明:PEG400成功接枝到纳米SiO_2粉体表面,且自制低分子量PET共聚到了一元接枝纳米SiO_2上;改性后的纳米SiO_2粉体在PET树脂中的分散性得到改善;纳米SiO_2粉体通过PEG400和低分子量PET改性后可提高PET树脂的表观黏度,改善PET树脂的脆性。     

PET表面改性研究进展

综述了国内外聚对苯二甲酸乙二醇酯(PET)的表面改性研究进展.PET表面改性方法主要有:化学接枝改性、紫外光辐照接枝改性、高能射线辐照接枝改性、等离子体处理接枝改性以及臭氧氧化改性等;通过PET表面改性,可以改善PET的亲水性、抗静电性、粘附性和生物相容性等性能;介绍了改性PET在相关领域中的应用;指出PET的表面改性...     

PET抗静电复合材料的性能研究

以PET为基体树脂,研究了3种不同类型的抗静电剂与PET熔融共混制备的抗静电复合材料的力学性能、抗静电性能及微观形态。结果表明,含磺酸盐及聚醚的复合抗静电母料和聚醚型复合抗静电母料均可显著提高PET的抗静电性能,当两种母料的质量分数均为3%时,可使PET复合材料的表面电阻率均降低6~7个数量级,而对复合材料的力学性能影响不大;非离子型表面活性剂的改性效果较差。     

环氧丙烷/CO_2等离子处理对PET薄膜阻氧性能的影响

利用环氧丙烷/CO_2等离子体对聚对苯二甲酸乙二醇酯(PET)薄膜表面进行处理。傅里叶红外光谱分析表明,PET 表面沉积了树脂阻透层。采用气体渗透性测定仪对 PET 薄膜的阻透性能进行了研究。结果表明,环氧丙烷/CO_2等离子体的放电功率、工作压强、放电时间均会影响 PET 薄膜的阻透性能。随着放电功率和处理压强的增加,PET 薄膜的氧阻透性能先上升后下降。随着放电时间的延长,PET 薄膜的氧阻透性能不断增加,但增加的速度在后期放缓。     

纳米纤维素接枝PET纤维织物的制备和表征

表面修饰是工业生产和科研过程中对涤纶(PET)纤维改性的主要手段。纳米微晶纤维素在Lewis酸和交联剂2D树脂存在的条件下,接枝到PET纤维表面以改变织物性能,并通过TGA、TEM和FE-SEM对纳米微晶纤维素接枝PET纤维织物进行了表征。     

PET聚酯表面改性技术应用进展

PET聚酯的表面改性相对共混、共聚等改性手段灵活.不仅仅用于纤维成型过程,还可在织物、薄膜以及片材等加工过程实施,使最终产品性能得到极大的提升.详细地介绍了PET材料表面改性技术进展,包括纤维截面异形化技术、材料吸附涂层、化学蚀刻、接枝、光化学、等离子、离子溶液、超临界二氧化碳等新技术应用的进展;以及在亲水、改善染色、拒水、阻燃、气体阻隔、生物相容性、抗菌等功能性市场的开发和应用.以技术纺织品、聚酯瓶和聚酯薄膜为主的最终产品市场发展前景良好,PET表面改性技术为最终应用领域的市场拓展和可持续发展起到极为有效作用.     

非胶体钯活化PET塑料化学镀铜的研究

研究了PET塑料表面化学镀铜的表面预处理以及化学镀铜工艺对化学镀铜的影响，PET塑料经过碱性高锰酸钾处理后，表面的粗糙度大大增加，提高了塑料表面对金属镀层的附着力。研究表明，化学镀铜的速度与温度、pH值以及甲醛含量等因素相关，最佳pH为12．5，最佳温度为50℃，甲醛的最佳含量为15mL／L。     

钛白粉表面的有机改性及表征

通过钛白粉表面改性处理可实现钛白粉表面由亲水性改变为亲油疏水性,最终得到了一种在聚对苯二甲酸乙二醇酯(PET)基材中分散稳定的钛白粉。采用单一变量分析方法,研究了表面活性剂的种类、表面活性剂的添加量、改性时间和表面活性剂的加入方式等因素对改性钛白粉分散效果的影响,并将表面处理后的钛白粉加工成PET母粒,对母粒进行过滤压力值测试。实验结果显示,采用蠕动泵滴加的方式,加入质量分数为3%钛白粉的硬脂酸,反应时间20 min,最终可以得到分散性较好的钛白粉,且质量分数为3%硬脂酸改性钛白粉对PET基材的老化无明显的促进作用。     

Study of masterbatch effect on miscibility and morphology in PET/HDPE blends

The present work studies the morphology in poly(ethylene-terephthalate)/polyethylene (PET/HDPE) polymer blends and its impact on blend properties. Mixing process in blend preparation is the important parameter for the type of obtained blend morphology and final blend properties, so two different mixing processes were used. In the first one, all components are mixed together while another one includes two step mixing procedure using two different types of masterbatch as compatibilizers for PET/HDPE system. Such blends can be considered in terms of PET polymer recycling in the presence of HDPE impurities in order to find suitable compatibilizers, which will enhance the interactions between these two polymers and represents the possible solution in recycling of heterogeneous polymer waste. The morphology of the studied PET/HDPE blends was inspected by scanning electron microscopy to examine the influence of the mixing process and various compositions on blends morphology, and interactions between PET and HDPE. The surface properties were characterized by contact angle measurements. The effect of the extrusion on the samples thermal behaviour was followed by DSC measurements. FTIR spectroscopy was used for the determination of interactions between blend constituents. It can be concluded that the type of mixing process and the carefully chosen compatibilizer are the important factors for obtaining the improved compatibility in PET/HDPE blends.     

Improved compatibility of high‐density polyethylene/poly(ethylene terephthalate) blend by the use of blocked isocyanate group

The blocked isocyanate group (BHI) was synthesized to improve the storage stability of HI (2‐hydroxyethyl methacrylate combined with isophorone diisocyanate) and characterized by Fourier transform infrared spectroscopy (FTIR). High‐density polyethylene grafted with the blocked isocyanate group (HDPE‐g‐BHI) was used as a reactive compatibilizer for an immiscible high‐density polyethylene/poly(ethylene terephthalate) (HDPE/PET) blend. A possible reactive compatibilization mechanism is that regenerated isocyanate groups of HDPE functionalized by BHI react with the hydroxyl and carboxyl groups of PET during melt blending. The HDPE‐g‐BHI/PET blend showed the smaller size of a dispersed phase compared to the HDPE/PET blend, indicating improved compatibility between HDPE and PET. This increased compatibility was due to the formation of an in situ graft copolymer, which was confirmed by dynamic mechanical analysis. Differential scanning calorimetry (DSC) analysis represented that there were few changes in the crystallinity for the continuous PET phase of the HDPE‐g‐BHI/PET blends, compared with those of the HDPE/PET blends at the same composition. Tensile strengths and elongations at the break of the HDPE‐g‐BHI/PET blends were greater than those of the HDPE/PET blends. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 1017–1024, 2000     

Thermostimulative shape‐memory effect of reactive compatibilized high‐density polyethylene/poly(ethylene terephthalate) blends by an ethylene–butyl acrylate–glycidyl methacrylate terpolymer

High‐density polyethylene (HDPE)/poly(ethylene terephthalate) (PET) blends were prepared by means of melt extrusion with ethylene–butyl acrylate–glycidyl methacrylate terpolymer (EBAGMA) as a reactive compatibilizer. The effects of the EBAGMA and PET contents, recovery temperature, and stretch ratio on the thermostimulative shape‐memory behavior of the blends were studied. The results show that the addition of EBAGMA to the HDPE/PET blends obviously improved the compatibility and the shape‐memory effects of the blends. The response temperature was determined by the melting point of HDPE, and the shape‐recovery ratio of the 90/10/5 HDPE/PET/EBAGMA blend reached nearly 100%. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

聚烯烃改性PET的研究

通过PET与PP、HDPE、EPDM挤出共混，注射模塑制得试样。经DTA、SEM和力学性能测试，表征了共混体系的热行为、结构形态和力学性能。结果表明，在PET/PP(EPDM、HDPE)共混体系中，加入少量的PP-g-MI(EPDM-g-MAH、PE-g-MI)，可较好地改善PEt与PP(EPDM、HDPE)之间的相容性，使分散相在PET基体连续相中分散均匀，分散相尺寸减小，增加了两相间界面的粘结力；同时对PET的结晶有较强的促进作用，使其冷结晶温度降低，改善了PET的加工性能；并且能大幅度提高共混物的冲击强度。     

Rheological behavior comparison between PET/HDPE and PC/HDPE microfibrillar blends

The rheological behaviors of in situ microfibrillar blends, including a typical semicrystalline/semicrystalline (polyethylene terephthalate (PET)/high‐density polyethylene (HDPE)) and a typical amorphous/semicrystalline (polycarbonate (PC)/HDPE) polymer blend were investigated in this study. PET and PC microfibrils exhibit different influences on the rheological behaviors of microfibrillar blends. The viscosity of the microfibrillar blends increases with increased PET and PC concentrations. Surprisingly, the length/diameter ratio of the microfibrils as a result of the hot stretch ratio (HSR) has an opposite influence on the rheological behavior of the two microfibrillar blends. The stretched PET/HDPE blend exhibits higher viscosity than the unstretched counterpart, while the stretched PC/HDPE blend exhibits lower viscosity than the unstretched blend. The data obtained in this study will be helpful for constructing a technical foundation for the recycling and utilization of PET, PC, and HDPE waste mixtures by manufacturing microfibrillar blends in the future. POLYM. ENG. SCI., 45:1231–1238, 2005. © 2005 Society of Plastics Engineers     

原位增容HDPE／PET共混体系反应挤出形态结构的研究

通过扫描电镜照片（ＳＥＭ）研究了ＨＤＰＥ／ＰＥＴ共混体系在双螺杆反应挤出过程中,共混合金冲击断面的形态特征。结果表明,增容剂ＥＶＡ或ＥＡＡ均对ＨＤＰＥ／ＰＥＴ共混体系具有一定的增容作用;使分散相颗粒减小,且变得较为均匀,两相界面变得模糊,界面粘结力增强。其中,ＥＡＡ的增容效果优于ＥＶＡ。在此增容的基础上,选用有机化合物Ｄ作为催化剂,在熔融加工的过程中,使ＰＥＴ与ＥＶＡ或ＥＡＡ发生酯交换或酸－酯交换反应,生成ＰＥＴ－ＥＶＡ或ＰＥＴ－ＥＡＡ接枝共聚物,达到了原位增容ＨＤＰＥ／ＰＥＴ共混体系的目的,从而进一步改善了体系的相容性,共混体系的力学性能也得到了有效的提高     

The effect of irradiation on morphology and properties of the PET/HDPE blends with trimethylol propane trimethacrylate (TMPTA)

The mechanical properties of poly(ethylene terephthalate)/high-density poly(ethylene) (PET/HDPE) blends were improved by γ-ray irradiation combined with using a cross-linking agent—trimethylol propane trimethacrylate (TMPTA). The effect of the weight ratio of PET/HDPE, the content of TMPTA and the absorbed dose on the phase morphology and the mechanical properties of the PET/HDPE blends were investigated through scanning electron microscopy (SEM), gel fraction, Fourier transform infrared spectroscopy (FTIR), tensile and impact tests. SEM images showed that the phase structure changed significantly as TMPTA coexistence. The results of tensile and impact tests indicated that their mechanical properties depended on their structures. FTIR spectra suggested that a new structure of HDPE-g-PET was generated. When the weight ratio of PET/HDPE blend was 80/20, the content of TMPTA was 1 wt% and the absorbed dose was 30 kGy, the tensile strength, elongation at break and impact strength of irradiated blends were improved greatly compared with non-irradiated blends.     

Processability and thermal properties of blends of high density polyethylene,poly (ethylene terephthalate), and ethyl vinyl acetate compatibilizer

Because of differences in chemical structure and rheological characteristics, high density polyethylene (HDPE) and poly(ethylene terephthalate) (PET) are incompatible when blended during recycling of PET soft drink bottles. To improve the properties of the blends, ethylene vinyl acetate copolymer (EVA) was used as a compatibilizer. Based on torque rheometer tests, the higher the concentration of PET in the blends, the higher the initial loading torque. Blends of 50% HDPE and 50% PET had the lowest equilibrium torque. Equilibrium torque was highest at 5% EVA. The presence of EVA made only a slight difference in the glass transition temperatures of HDPE/PET blends. Higher EVA content in the blend resulted in a lower melting endotherm. Thermogravimetric analysis showed that thermal stability was independent of EVA content; but the more PET in the blend, the lower the final weight loss.     

Mechanical and fracture characterization of 50:50 HDPE/PET blends presenting different phase morphologies

Uncompatibilized and compatibilized blends of poly(ethylene terephthalate) (PET) and high‐density polyethylene (HDPE) (50:50 PET/HDPE) have been prepared and characterized. A commercial grade of ethylene/methacrylic acid copolymer was used as compatibilizing agent and added to the blends in two different proportions, 1% and 7%. Compounded blends were processed following three different procedures: compression molding, extrusion, and extrusion followed by annealing. In every case, there is evidence that suggests that HDPE constitutes the matrix and PET is the dispersed phase. The PET phase shape was related to the processing procedure of the blends. PET adopted a globular morphology in the compression molded samples but it took the form of microfibers (microfibrillar‐like reinforced composites) in extruded samples, which were flattened during the postextrusion annealing process. According to the results obtained in tensile and fracture tests, extruded blends having 7% of ethylene/methacrylic acid copolymer appeared as the optimum combination of processing method and compatibilizer content. POLYM. ENG. Sci., 45:354–363, 2005. © 2005 Society of Plastics Engineers     

Effect of microfiber reinforcement on the morphology,electrical, and mechanical properties of the polyethylene/poly(ethylene terephthalate)/carbon nanotube composites

In situ microfiber reinforced conductive polymer composites consisting of high‐density polyethylene (HDPE), poly(ethylene terephthalate) (PET), and multiwalled carbon nanotube (CNT) were prepared in a twin screw extruder followed by hot stretching of PET/CNT phase in HDPE matrix. For comparison purposes, the HDPE/PET blends and HDPE/PET/CNT composites were also produced without hot stretching. Extrusion process parameters, hot‐stretching speed, and CNT amount in the composites were kept constant during the experiments. Effects of PET content and molding temperature on the morphology, electrical, and mechanical properties of the composites were investigated. Morphological observations showed that PET/CNT microfibers were successfully formed in HDPE phase. Electrical conductivities of the microfibrillar composites were in semi‐conductor range at 0.5 wt% CNT content. Microfiber reinforcement improved the tensile strength of the microfibrillar HDPE/PET/CNT composites in comparison to that of HDPE/PET blends and HDPE/PET/CNT composites prepared without hot stretching. POLYM. ENG. SCI., 2010. © 2010 Society of Plastics Engineers