Performance of CTBN(carboxyl-terminated poly (butadiene-<Emphasis Type="Italic">co</Emphasis>-acrylonitrile))-EP(diglycidyl ether of bisphenol-A (DGEBA)) prepolymers and CTBN-EP/polyetheramine (PEA) system

CTBN-EP prepolymers were synthesized from CTBN and epoxy resin under the catalysis of HTMAB. FTIR analyses indicate the formation of ester group between the carboxyl group of CTBN and the oxirane group of epoxy resin. The viscosity of modified prepolymer increases with CTBN content increasing, but the epoxy value of the prepolymer decreases greatly. DSC analyses verify that CTBN affects the curing process of CTBN-EP/PEA system. Mechanical testing presents the improved toughness of CTBN-EP/PEA curings for the decrease of tensile strength, flexural strength and compressive strength, and increase of impact strength and elongation-at-break with the CTBN content increasing. SEM micrographs show the rubber phase with many holes in diameter about 0.5–1.5 µm is formed when CTBN content is lower than 10 phr. However, the pattern of SEM graph shows some stalactite-like strips when CTBN content is higher than 15 phr. Furthermore, the SEM image of 25 phr CTBN sample forms a kind of co-continuous structure.     

半酯法合成环氧丙烯酸酯型光敏涂料

开发了一种用半酯法合成环氧丙烯酸酯型光敏涂料的方法。法首先使顺丁烯二酸酐与丙烯酸羟乙酯进行开环反应制和半酯化合物，然后使之和环氧树脂或环氧大豆油反应，制和光敏预聚物，以这些光敏预聚为基，在光敏引发剂和各种活性稀释剂的存在下，制得了代号为EP和SOYA的两种光敏涂料，并对其光固化膜的物性进行了表征。     

Curing Kinetics,Mechanical Properties and Thermal Stability of Epoxy/Graphene Nanoplatelets(GNPs) Powder Coatings

Epoxy/graphene nanoplatelets(GNPs) powder coatings were fabricated using ultrasonic predispersion of GNPs and melt-blend extrusion method. The isothermal curing kinetics of epoxy/GNPs powder coating were monitored by means of real-time Fourier transform infrared spectroscopy(FT-IR) with a heating cell. The mechanical properties of the epoxy/GNPs cured coatings had been investigated, by evaluating their fracture surfaces with field-emission scanning electron microscopy(FE-SEM) after three-point-bending tests. The thermal stability of the epoxy/GNPs cured coatings was studied by thermo-gravimetric analysis(TGA). The isothermal curing kinetics result showed that the GNPs would not affect the autocatalytic reaction mechanism, but the loading of GNPs below 1.0 wt % additive played a prompting role in the curing of the epoxy/GNPs powder coatings. The fracture strain, fracture toughness and impact resistance of the epoxy/GNPs cured coatings increased dramatically at low levels of GNPs loading(1 wt %), indicating that the GNPs could improve the toughness of the epoxy/GNPs powder coatings. Furthermore, from FE-SEM studies of the fracture surfaces, the possible toughening mechanisms of the epoxy/GNPs cured coatings were proposed. TGA result showed that the incorporation of GNPs improved the thermal stability of the cured coatings. Hence, the GNPs modified epoxy can be an efficient approach to toughen epoxy powder coating along with improving their thermal stability.     

环氧树脂改性聚乙烯材料的研究

用熔融共混方法,将环氧树脂和马来酸酐引入到聚乙烯（PE）中,制备出环氧树脂增强聚乙烯材料。力学性能测试表明,与纯聚乙烯相比,环氧树脂增强聚乙烯材料的弯曲强度有较大提高。红外光谱分析表明,在熔融共混制备环氧树脂增强聚乙烯材料的过程中,环氧树脂与马来酸酐接枝PE发生了官能团之间的反应,促进环氧树脂对PE的增强效果。形态分析表明,聚乙烯中加入环氧树脂和其它助剂后,材料的内部形态结构发生了改变。     

磷氮阻燃固化剂对环氧树脂阻燃性能的影响

为了提高环氧树脂固化体系的阻燃性能,以1,3-丙二胺(DPAN)和苯膦酰二氯(PPDC)为主要原料合成一种新型磷氮反应型阻燃固化剂(PPDPA),对合成化合物的组织结构和热性能进行了表征.以不同比例PPDPA为固化剂,制备一系列具有不同磷含量的阻燃环氧树脂,并对其进行热性能分析和阻燃性能测试.结果表明,添加PPDPA的环氧树脂体系的500 ℃残炭明显高于EP/DPAN体系,且残炭表面磷碳层具有明显的发泡现象.当磷的质量分数达到2.12%时,EP-2样品成功通过UL94 V-0阻燃等级测试,LOI值达到28.3%,PPDPA在环氧树脂材料中表现出了良好的阻燃性能.     

丙烯酸酯改性己二胺固化剂对环氧树脂性能的影响

利用丙烯酸酯类对己二胺进行改性,作为环氧树脂的室温固化剂。利用红外光谱分析了固化剂的氨解变化,讨论了改性固化剂对环氧树脂固化反应产物的拉伸、弯曲、冲击等性能的影响。实验结果表明,丙烯酸酯改性的己二胺固化剂可以在室温下固化环氧树脂,所得的环氧树脂具有较好的力学性能。     

玄武岩纤维布增强环氧树脂复合材料研究

以玄武岩纤维平纹布 (BF) 加入到环氧树脂 (EP) 中,采用模压工艺制备BF／EP 复合材料,研究加入不同层数的玄武岩纤维布对复合材料力学性能和断裂韧性的影响。实验结果表明,BF/EP复合材料的弯曲强度、冲击强度和断裂韧性明显优于环氧树脂;与未加BF的环氧树脂相比,加入三层BF后复合材料的弯曲强度提高了2.76倍,缺口冲击强度提高了19.67倍,无缺口冲击强度提高了5.94倍,KIC提高了2.97倍。     

水性环氧乳液的制备与性能

采用丁二酸酐对聚乙二醇单甲醚(mPEG)进行改性,得到羧酸型mPEG⁃COOH,将mPEG⁃COOH与环氧树脂反应,得到水性环氧树脂乳化剂。环氧树脂乳化剂与环氧树脂混合,通过相反转技术,得到稳定的水性环氧树脂乳液。采用红外光谱、高效液相色谱、粒度分析仪等对该乳化剂的结构及环氧树脂乳液的稳定性、粒径分布等进行表征。研究了乳化剂合成时甲氧基聚乙二醇相对分子质量、环氧树脂相对分子质量、乳化剂浓度等对乳液稳定性的影响。结果表明,成功制备出了水性环氧乳化剂及水性环氧乳液。水性环氧乳液的粒径分布在0.8~1.5 μm,且乳液稳定性良好。该水性环氧树脂乳液与胺类固化剂室温固化后,所得涂膜具有较好的耐水、耐污性能,其吸水率和耐水失重率分别为0.35%和0.25%。     

液体端羧基丁腈橡胶改性氰酸酯树脂的结构与性能

采用液体端羧基丁腈橡胶(CTBN)对氰酸酯树脂(CE)进行共混改性。利用红外光谱、扫描电子显微镜等手段表征共混物的结构,测定其力学性能、耐热性等。实验结果表明,液体端羧基丁腈橡胶改性氰酸酯树脂可形成典型的海岛状共混结构;当面均粒径为2～3μm时,增韧效果最佳;当CTBN加入10份时,冲击强度提高150%,最大失重率所对应的温度只下降3.5℃。     

Structural characteristics and properties of PU-modified TDE-85/MeTHPA epoxy resin

Diglycidyl-4,5-epoxycyclohexane-1,2-dicarboxylate (TDE-85)/methyl tetrahydro-phthalic anhydride (MeTHPA) epoxy resin was modified by polyurethane(PU), and its structural characteristics and properties were studied by infrared spectrum analysis (IR), scanning electronic microscopy (SEM), mechanics testing and thermogravimetric analysis (TG). The results indicate that epoxy polymeric network I and polyurethane polymeric network II are formed in the PU-modified TDE-85/MeTHPA epoxy resin. Meanwhile the PU-modified TDE-85/MeTHPA resins have heterogeneous structure. The miscibility between epoxy (EP) and polyurethane (PU) as well as the phase size are dominantly determined by the mass fraction of polyurethane prepolymer (PUP) in the EP/PU blends. With the increase of PUP mass fraction, the tensile strength, impact strength and thermal stability of the PU-modified TDE-85/MeTHPA epoxy resin all firstly exhibit increasing tendency, and decrease after successively reaching their maxima. When the number-average molecular mass of PPG is 1 000 and the mass fraction of PUP is 15%, the tensile strength, impact strength and thermal stability of materials obtained, compared with TDE-85/MeTHPA epoxy resin, are improved obviously.     

不饱和聚酯-环氧树脂嵌段共缩聚型光敏预聚物的合成与应用

提出了一种由不饱和聚醋和环氧树脂嵌段共缩聚，合成一类新型光敏预聚物的方法．该光敏预聚物采用两步法合成．第一步先合成具有一定分子量和端羧基的不饱和聚酯，第二步使该不饱和聚酯与环氧树脂反应，生成嵌段共缩聚物．该光敏预聚物的分子量通过调节不饱和聚酯的分子量控制．不同分子量的光敏预聚物呈现出不同的光敏性和力学性能．     

二氧化硅改性环氧树脂胶黏剂性能研究

采用聚氨酯增韧环氧树脂,并利用有机化的纳米SiO2为改性剂制备纳米改性环氧树脂胶黏剂.利用扫描电子显微镜( SEM)观察无机纳米粒子在聚合物基体中的分散性及复合材料的断面形貌,结果表明无机纳米粒子在复合材料中分散性良好,而且聚氨酯在环氧树脂基体中形成了“孔洞结构”.采用电子拉力机、TGA以及介电谱仪等方法测试了复合材料...     

水镁石/硼酸锌复合阻燃环氧树脂的制备与性能

针对环氧树脂在添加普通水镁石阻燃剂后力学性能恶化的问题,通过对水镁石的改性和复配制备了一种新型阻燃剂.通过SEM观察水镁石粉体及阻燃环氧树脂断面的表面形貌,利用弯曲强度测试考察阻燃环氧树脂的力学性能,测定氧指数考察其阻燃性能.结果表明,水镁石用量为30%时阻燃EP性能最好.用硅烷偶联剂Ⅰ和Z6173改性,阻燃EP的弯曲强度和氧指数分别为5.21 M Pa、28.9%和4.82 M Pa、29.1%.用6份的硼酸锌与硅烷偶联剂Ⅰ改性的水镁石复配制得的复合阻燃剂,其制备成的阻燃EP的弯曲强度和氧指数最高达到4.85 MPa和29.3%.     

梯度互穿网络聚合物增韧环氧树脂的研究

采用梯度IPNs方法对环氧进行增韧改性，提出一种新的数学模型描述梯度材料中梯度组分的分布，并采用逐层浇筑的方法制备了不同层数的EP／PU梯度互穿网络聚合物（IPNs）材料，通过冲击强度和拉伸强度评价其对环氧的增韧结果，并与普通IPNs的增韧效果进行了对比。研究结果表明梯度层数越多，增韧效果越好，当梯度层数超过7层后，增韧效果变化不大。增韧效果最好的7层梯度IPNs使环氧的冲击强度提高约3倍，普通IPNs仪提高约2倍．     

Influence of Matrixes on Microstructure and Properties of CTBN Toughened Epoxy Resins

The influence of the type of epoxy resins (E-51, F-51) on the mechanical properties and mi-crostructure of carboxyl-terminated butadiene nitrile rubber ( CTBN) toughened epoxy resins was investigated by determination of adhesive strength and toughness as well as observation of scanning electron microstructure (SEM). The resuhs indicate that the adhesive strength of CTBN toughened E-51 system is superior to CTBN toughened F-51 system. However, CTBN toughened E-51 system is inferior to CTBN toughened F-51 system in the toughness . This difference is related to the microstructure of two toughened systems . For CTBN toughened F-51, larger cavities and rubber particles are found in the system.. The larger cavities easily cause stress concentration and result in decrease of the adhesive strength. While the larger rubber particles may better terminate the development of crazing and shear banding and result in increase of the toughness .     

耐腐蚀水乳液的制备及其在涂料中的应用

水性化技术是消除传统溶剂型涂料中挥发性有机物（VOC）的有效手段,但现有水性涂料的耐腐蚀性与溶剂型产品相差较大。本文以二元醇、异氰酸酯、环氧树脂等为基本原料,合成一种自乳化型耐腐蚀水乳液并制备相应涂料,对乳液进行红外表征,优化乳液固化条件,并对固化后涂料的耐热性及其基本性能进行分析测试。结果表明:所制备的乳液分子中各原料发生了预设的反应;二元醇分子量对产物耐腐蚀性能有一定影响,当分子量为4 000时,产物耐腐蚀性最优;乳液与固化剂质量比为8:1时达到最优配比;该涂料的耐中性盐雾试验时间可达1 100 h以上;其他各种性能良好。     

螺环原碳酸酯的预聚物对环氧树脂的改性研究

利用一种新的带羟基的螺环原碳酸酯单体，３，９－二羟甲基－３，９－二乙基－１，５，７，１１－四氧杂螺（５．５）十一烷，用膨胀计测试其在聚合过程中体积的变化，膨胀率为２．０％，并利用它的两种预聚物对环氧树脂进行改性，测试了固化改性环氧树脂的热性能，以及改性环氧树脂作为粘合剂使用时的拉伸强度和剪切强度。     

液晶改性芳纶增强环氧树脂的相容性与力学性能

针对环氧树脂复合材料存在的应力开裂以及与基体界面相容性差等问题,采用液晶和离子单体对芳纶纤维进行改性,再与环氧树脂及固化剂按一定比例混合,制得液晶改性芳纶增强环氧树脂复合材料.正交试验结果表明,常温下固化20min,芳纶、环氧树脂与固化剂的质量比为0.07∶35∶11,复合材料的弯曲应力为445.6MPa,应变为0.975%,比水解芳纶增强环氧树脂复合材料、芳纶增强环氧树脂复合材料的弯曲应力分别提高了29%和33%.扫描电镜研究表明,复合材料中分散相在基体中的分散性较好,有良好的界面相容性,断面处的断裂方式由脆性断裂变为韧性断裂.红外光谱研究表明,加入液晶改性芳纶的复合材料出现了磺酸基团和氮氮双键的特征吸收峰.     

双马来酰亚胺与环氧改性氰酸酯固化工艺研究

研究了双酚A型二氰酸酯树脂（BCE）与双马来酰亚胺树脂（BMI）、环氧树脂（EP）的共聚反应；通过差示扫描量热法（DSC）对其性能进行了研究和表征。实验发现，BMI与BCE的反应性不如EP与BCE的反应性好，故采用先使BMI与BCE反应，然后再加入EP的方法得到了较为良好的树脂浇铸体样品。用FTIR对树脂的固化进行跟踪分析。研究结果表明，体系的固化反应中包含BMI自聚合反应、BCE自聚合反应、BCE与BMI共聚反应、BCE与EP共聚反应等。     

纳米微波吸收剂对改性环氧胶粘剂微波固化性能的影响

选取4种典型的纳米材料作为微波吸收剂,研究其对改性环氧胶粘荆在微波作用下固化时间及固化后力学性能的影响.结果表明,在相同固化条件下,纳米微波吸收荆能明显降低改性环氧胶粘剂的微波固化时间.随着添加量的增加,固化时间大大缩短,其中纳米Fe和纳米siOx 尤为突出.当添加质量分数超过3%时,固化时间小于5 min.力学性能测试表明,添加纳米Fe和纳米Fe3)4后,胶粘剂微波固化后的拉伸强度和弹性模量没有明显变化,当添加质量分教为4%时,拉伸强度分别为33.8 MPa和34.1 MPa;而添加纳米siOx和SiC后,拉伸强度和弹性模量值略有下降.