环氧树脂改性MC尼龙的研制

论述了Ｅ－５１环氧树脂改性ＭＣ尼龙的方法和改性ＭＣ尼龙的性能，结果表明，改性ＭＣ尼龙的缺口冲击强度和耐磨性能均有明显提高，为ＭＣ尼龙的改性提供了一条新途径。     

LLDPE—氢氧化镁复合材料性能研究

研究了偶联剂种类及用量与以线型低密度聚乙烯（ＬＬＤＰＥ）为基体的复合材料ＬＬＤＰＥ－Ｍｇ（ＣＨ）２的力学性能关系；同时考察了处理与未处理的氢氧化镁对复合体系力学性能及阻燃性能影响。结果表明，经表面处理的Ｍｇ（ＯＨ）２填充到ＬＬＤＰＥ中，其复合体系的分散性、力学性能、流动性均优于未处理的ＬＬＤＰＥ－Ｍｇ（ＯＨ）２复合体系，且关剂对Ｍｇ（ＯＨ）２的表面改性处理，主要改善了材料的力学性能，对阻燃性能影响     

PP／EVA－15共混物的研究

应用ＳＥＭ和力学性能测试研究了ＰＰ／ＥＶＡ－１５共混物原料配比、工艺条件和微观结构形态对材料性能的影响，对共混物的增韧机理进行了分析。与弹性体（ＥＰＤＭ）改性ＰＰ所作的比较显示，ＥＶＡ－１５对ＰＰ有良好的改性效果，其综合性能优于ＰＰ／ＥＰＤＭ共混物。     

超高分子量聚乙烯纤维粘接性的研究

初步研究了拉伸倍率、共混改性、化学试剂表面处理对超高分子量聚乙烯（ＵＨＭＷ－ＰＥ）纤维粘接性和强度的影响。结果表明，用铬酸洗液对ＰＥ纤维进行物理和化学改性，是改善ＵＨＭＷ－ＰＥ纤维／环氧树脂粘接性较为有效的方法。     

HDPE／炭黑导电复合材料的改性

本文研究了导电炭黑的品种、含量及其对高密度聚乙烯（ＨＤＰＥ）性能的影响，以及动态硫化对改善ＨＤＰＥ／导电炭黑复合材料物性的贡献。结果表明，ＨＧ－４型导电炭黑填充ＨＤＰＥ具有很好的导电性，复合材料力学性能较差；ＡＣＥＴ炭黑导电性较差，复合材料力学性能最好。炭黑并用能有效地降低生产成本，而且保持了材料的性能。动态硫化法可以克服复合材料物性差的弱点，并能保持改性材料的高导电性。在ＨＧ－４型炭黑含量为７份时，材料的拉伸强度１３ＭＰａ，断裂伸长率３５０％，体积电阻率为２．１Ω·ｃｍ。     

聚醚砜改性的E—44／DDM胶粘剂

聚醚砜改性的Ｅ－４４／ＤＤＭ胶粘剂葛建芳（广东石油化工专科学校茂名５２５０００）［摘要］本文介绍了经聚醚砜（ＰＥＳ）改性的Ｅ－４４／ＤＤＭ胶粘剂的粘接性能及相态结构。［关键词］环氧树脂;聚醚砜;改性Ｅ－４４／ＤＤＭＡｄｈｅｓｉｖｅＭｏｄｉｆｉｅｄｂ...     

LDPE／炭黑导电复合材料电学及力学性能研究

研究了炭黑种类及用量、极性共聚物（Ｅ－ＡＥ－ＭＡＨ）、润滑剂种类及用量和交联剂（ＤＣＰ）对ＬＤＰＥ／炭黑导电复合材料电学及力学性能的影响。结果表明,ＨＧ－４型炭黑导电性最好,ＡＣＥＴ炭黑导电性较差。极性共聚物能提高复合材料的导电性和力学性能。高分子蜡改善复合材料电学及力学性能的效果优于液体石蜡。交联剂使复合材料导电性变差,但力学性能提高     

PC／PE共混体系中增容剂最佳用量的确定

本文以聚碳酸酯（ＰＣ）／聚乙烯（ＰＥ）／聚乙烯蜡接技马来酸酐（ＰＥＷ－ｇ－ＭＡＨ）三元共混物为体系，研究了第三组份增容剂ＰＥＷ－ｇ－ＭＡＨ用量。共混物两相之间界面张力和共混物力学性能之间的相互关系。论证了通过测量高聚物之间界面张力来确定第三组份增容剂的最佳用量的技术途径。     

ABS和SMA对聚碳酸酯的共混改性

研究了聚碳酸酯和ＡＢＳ及少量ＳＭＡ的机械共混改性。聚碳酸酯和ＡＢＳ共混，可改善共混体系的加工性能和提高其冲击强度。共混体系中添加少量ＳＭＡ，使聚碳酸酯与ＡＢＳ在微观相界面上有较好的结合力，提高了聚碳酸酯与ＡＢＳ的相容性。从而进一步改善了共混体系的加工性能和提高了共混体系的冲击强度，其中低温缺口冲击强度的提高尤为显著。     

无机氟改性的HZSM—5分子筛催化1,2,4—三甲苯与甲醇烷基化合成…

用不同浓试的ＮＨ４Ｆ对ＨＺＳＭ－５分子筛进行改性制成偏三甲苯－甲醇烷基化反应的催化剂，考察反应时间、改性剂浓度、焙烧温度对其催化性能的影响。结果发现，无机氟改性使ＨＺＳＭ－５分子筛对偏三甲苯－甲醇烷基化合成均四甲苯反应的活性、选择性及催化剂的稳定性都有良好的促进作用，并且改性后的ＨＺＳＭ－５分子筛加入结合剂制成的催化剂仍具有良好的催化性能。采用ＳＥＭ、ＩＲ及ＴＰＤ等方法测试无机氟改性后ＨＺＳＭ－５     

Mechanical and morphological properties of carbon fiber reinforced–modified epoxy composites

Epoxy, prepared through aminomethyl 3,5,5‐trimethylcyclohexylamine hardening of diglycidylether of bisphenol‐A (DGEBA) prepolymer, toughened with polycarbonate (PC) in different proportions, and reinforced with carbon fiber, was investigated by differential scanning calorimetry, tensile and interlaminar shear strength testing, and scanning electron microscopy (SEM). A single glass transition temperature was found in all compositions of the epoxy/PC blend system. The tensile properties of the blend were found to be better than that of the pure epoxy matrix. They increased with PC content up to 10%, beyond which they decreased. The influence of carbon fiber orientation on the mechanical properties of the composites was studied, where the fiber content was kept constant at 68 wt %. Composites with 45° fiber orientation were found to have very weak mechanical properties, and the mechanical properties of the blend matrix composites were found to be better than those of the pure epoxy matrix composites. The fracture and surface morphologies of the composite samples were characterized by SEM. Good bonding was observed between the fiber and matrix for the blend matrix composites. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 3529–3536, 2006     

玻璃纤维／环氧树脂复合材料的热性能

本文采用E-玻璃纤维作为增强材料、双酚A环氧树脂和芳胺类固化剂作为基体制成复合材料试样,利用动态与静态热分析方法测定玻璃纤维／环氧树脂基复合材料的热性能,研究了玻璃纤维含量对复合材料动态热机械性能、玻璃化温度等热性能的影响。     

Mechanical properties of poly(styrene‐co‐acrylonitrile)‐modified epoxy resin/glass fiber composites

Poly(styrene‐co‐acylonitrile) was used to modify diglycedyl ether of bisphenol‐A type epoxy resin cured with diamino diphenyl sulfone and the modified epoxy resin was used as the matrix for fiber‐reinforced composites (FRPs) to get improved mechanical properties. E‐glass fiber was used as fiber reinforcement. The tensile, flexural, and impact properties of the blends and composites were investigated. The blends exhibited considerable improvement in mechanical properties. The scanning electron micrographs of the fractured surfaces of the blends and tensile fractured surfaces of the composites were also analyzed. The micrographs showed the influence of morphology on the properties of blends. Results showed that the mechanical properties of glass FRPs increased gradually upon fiber loading. Predictive models were applied using various equations to compare the mechanical data obtained theoretically and experimentally. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

The role of the terminal functional group of self‐assembled monolayers on fiber matrix adhesion

Adhesion at the fiber‐matrix interface of a composite is often influenced by a combination of factors such as mechanical interlocking, physicochemical interactions, and chemical bonding in the fiber‐matrix interphase region. We demonstrate the use of an approach using self‐assembled monolayers (SAMs) for studying the impact of one of the factors, chemical bonding, on the overall adhesion of the glass‐fiber/matrix interface. Transformation of these monolayer surfaces using conventional chemistry with a focus on the creation of a terminal functional group that interacts with epoxy resin is reported. The modified surfaces were characterized by ellipsometry, X‐ray photoelectron spectroscopy, and contact angle techniques for chlorosilane coverage, and in situ conversion. The adhesion of diglycidyl ether of bisphenol‐A resin to modified SAMs on E‐glass fibers was measured by performing single‐fiber fragmentation test. The extent of adhesion between the fiber and matrix was found to be dependent on the type of functional group at the terminal end of the SAM in contact with the epoxy matrix. Methyl terminal group resulted in the least adhesion, while amine terminal groups resulted in the most adhesion. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

短玻纤增强聚丙烯的研究进展

综述了近年来有关短玻纤增强聚丙烯复合材料的力学性能、变形机理和断裂韧性等方面的研究工作。短玻纤取向后的复合材料注射样的力学性能是各向异性的 ,复合材料在取向方向上具有更高的拉伸强度。玻纤与树脂基体间界面结合力的强弱对材料的力学性能同样起着至关重要的作用。良好的界面结合力保证了应力有效地从基体向玻纤传递 ,从而提高了复合材料的强度。由于短玻纤的分布既不均匀又不规则 ,在受到负荷时的变形过程很复杂 ,包括玻纤 -基体的界面脱黏、脱黏后的摩擦、基体的塑性变形、玻纤的塑性变形、玻纤断裂、基体断裂和玻纤抽出等     

In-situ composites: Evaluation of the adhesion between the thermoplastic matrix and the fibers of liquid crystalline polymer

Mechanical properties of fiber reinforced composites depend on the formation of stable adhesive bonds between the constituents. In order to evaluate quantitatively the adhesion between liquid crystal polymer (LCP) fibers and a thermoplastic matrix of polycarbonate, the single fiber composite test (SFC), utilized for testing glass or carbon fiber composites, has been used. Neither chemical nor physical interaction has been found: the PC and LCP phases are completely incompatible. However, a mechanical friction between PC and LCP was observed during the drawing of the sample when the neck of the matrix started.     

玻纤增强尼龙6的挤出工艺及力学性能

采用长玻纤连续添加和短切玻纤制备了玻纤增强尼龙6(PA6)复合材料。主要考察了玻纤含量、玻纤种类以及挤出工艺条件对复合材料力学性能的影响,并利用扫描电子显微镜对复合材料的冲击断面和拉伸断面及玻纤形态进行了观察。结果表明,采用短切玻纤加入时,玻纤含量对GF/PA6复合材料的力学性能影响很大。随玻纤含量的增加,复合材料的力学性能越来越高,断裂伸长率变低。加工工艺参数对复合材料的力学性能有影响。采用长玻纤连续添加时,玻纤的添加位置对复合材料的性能影响不大。在玻纤含量相同时,采用长玻纤连续添加得到的材料力学性能明显优于采用短切玻纤时的性能。玻纤能均匀地分散在PA6基体中,玻纤的保留长度和长度分布对复合材料的性能有直接影响。     

Modification of Glass Fiber-Reinforced Epoxy with Amine Functional Aniline Formaldehyde Condensate (AFAFC)

Unmodified epoxy glass fiber laminates are brittle by nature. In this study, an improvement of the mechanical properties, such as impact, tensile and flexural strengths of the reinforced glass fiber diglycidyl ether of bisphenol-A based epoxy laminate, was carried out by incorporating an amine functional aniline formaldehyde condensate (AFAFC) modifier. AFAFC was synthesized by reacting aniline and formaldehyde in an acid medium (pH 4) and was characterized by FT-IR and 1-H NMR spectroscopy, viscosity measurements, elemental analysis and potentiometric titration. The fracture energies of the modified glass fiber composite were vastly improved and the improvement depended on the concentration of the modifier. The optimum properties were obtained by adding 10 phr (parts per hundred parts of epoxy resin) of the modifier. Furthermore, the fracture energies of the modified glass fiber composite increased with increasing the number of glass fiber layers. Scanning electron microscopy showed that round shaped AFAFC oligomer domains were formed in the matrix. These oligomer domains led to improved strength and toughness due mainly to the 'rubber toughening' effect in the brittle epoxy matrix. The thermal stability of the modified epoxy composites by thermogravimetric analysis was also reported.     

Improved thermosets obtained from diglycidyl ether of bisphenol A/4,4′‐diaminodiphenylsulfone based on a new epoxy‐terminated hyperbranched polymer

A new hyperbranched polymer (HBP) with a flexible aromatic skeleton and terminal epoxy groups was synthesized to improve the toughness of diglycidyl ether of bisphenol A. The HBP was characterized using nuclear magnetic resonance, Fourier transfer infrared spectroscopy and gel permeation chromatography. The effect of HBP on the thermomechanical and mechanical properties of modified epoxy systems was studied. For evaluating the efficiency of the modified epoxy systems, composite samples using glass fiber cloth were molded and tested. Using dynamic mechanical analysis, a slight reduction in glass transition temperature (T_g) with increasing HBP content was observed. Analysis of fracture surfaces revealed a possible effect of HBP as a toughener and showed no phase separation in the modified resin systems. The results showed that the addition of 15 phr HBP maximized the toughness of the modified resin systems with 215 and 40% increases in impact and flexural strengths, respectively. T_g and heat resistance of cured modified resin systems decreased slightly with an increase in HBP content and, at 15 phr HBP, only a 2.6% decrease in thermomechanical properties was observed. Meanwhile, a molded composite with HBP showed improved mechanical properties and retention rate at 150 °C as compared to that made with neat resin. © 2015 Society of Chemical Industry     

Epoxy‐modified cyanate ester resin and its high‐modulus carbon‐fiber composites

Epoxy E51‐modified bisphenol A dicyanate (BADCy) and its high‐modulus carbon fiber (M40) reinforced composites were prepared in this research. The carbon‐fiber composites were prepared by autoclave molding. Differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy of BADCy‐E51 blend systems showed that polycyclotrimerization of BADCy primarily took place at low temperature. Epoxy group reacted with triazine ring group and produced oxazolidinone at high temperature. The data of mechanical properties, water absorption, and heat deflection temperature (HDT) of cured castings showed that the matrix system containing 95 wt% BADCy and 5 wt% E51 had optimum characteristics. Scanning electron microscopy (SEM) analysis of M40 fiber and the fracture surfaces of M40/BADCy‐E51 composite displayed that the adhesion between M40 fiber and BADCy was good though the surface of M40 was inert. The high retention of mechanical properties of M40/BADCy‐E51 composite after long‐term exposure to environmental conditions indicated that the M40/BADCy composite was suitable for space applications. POLYM. COMPOS., 27:402–409, 2006. © 2006 Society of Plastics Engineers