有机海泡石对环氧树脂阻燃性能的影响

通过硅烷偶联剂对海泡石(SEP)进行改性制备有机海泡石(O-SEP),将O-SEP和环氧树脂(EP)复合制备EP阻燃复合材料。通过傅里叶红外光谱(FTIR)对O-SEP的结构进行表征,并利用热失重分析(TGA)、UL 94垂直燃烧测试和锥形量热测试(CCT)等手段对EP复合材料的热性能、力学性能和阻燃性能进行研究。结果表明:硅烷偶联剂可以实现SEP的有机改性;O-SEP的加入可以提高复合材料的弯曲强度和冲击强度;随着O-SEP含量的增加,复合材料的热稳定性逐渐提高,O-SEP的引入可以提高复合材料的阻燃性能。     

LCP增韧EP/GF/PET复合材料的制备及性能

采用自制液晶聚合物(LCP)增韧改性玻璃纤维(GF)/聚酯纤维(PET)增强的环氧树脂(EP)复合材料,并考察了LCP含量对EP复合材料力学性能及热性能的影响,研究了其增韧机理。结果表明,LCP的加入会使EP复合材料的冲击强度有所提高,韧性变好,当LCP含量达到5%,其冲击强度比不添加LCP的复合材料提高了20.89%。LCP的加入在降低储能模量的同时提高了EP复合材料的玻璃化转变温度,5%失重温度也有所提高。LCP的加入使得EP复合材料冲击断口变得粗糙,有利于吸收冲击能量。     

具有抗菌活性的氧化锌/环氧树脂基纳米复合材料的研究

为了提高环氧树脂(EP)的抗菌性能,延长其使用寿命,采用纳米氧化锌(ZnO)粉末对脂环族EP进行改性,利用溶液浇注法制备了纳米ZnO/EP抗菌复合材料。研究了不同含量的纳米ZnO经硅烷偶联剂表面处理后,对复合材料的抗菌性能及力学性能的影响。结果表明:硅烷偶联剂处理后的纳米ZnO能够在EP中均匀分散;复合材料的抗菌性能随着纳米ZnO用量的增加而显著增大,加入1%纳米ZnO对大肠杆菌的抗菌率达到99.06%,对金黄色葡萄球菌的抗菌率达到99.00%;加入3%纳米ZnO时达到抗菌饱和,且弯曲强度出现极值,为EP的1.66倍;而纳米ZnO的加入对EP原有的固化温度和玻璃化转变温度几乎没有影响。     

EP/AlN/MWCNTs导热复合材料性能研究

采用硅烷偶联剂KH–550对氮化铝(Al N)颗粒进行表面处理,对多壁碳纳米管(MWCNTs)进行氧化处理。通过溶剂和超声分散法,分别制备了环氧树脂(EP)/Al N,EP/MWCNTs及EP/Al N/MWCNTs复合材料,用万能试验机测试了复合材料的冲击强度与弯曲强度,用热导率测定仪测试了其热导率,用扫描电子显微镜和透射电子显微镜测试了其微观结构。结果表明,Al N,MWCNTs在EP基体中分散均匀;单独或同时加入填料Al N和MWCNTs均能够提高EP复合材料的力学性能和导热性能。随着Al N,MWCNTs含量的增加,EP/Al N,EP/MWCNTs及EP/Al N/MWCNTs复合材料的冲击强度和弯曲强度均呈现先增大后减小的趋势,而热导率呈现逐渐增大的趋势;EP/Al N/MWCNTs复合材料的热导率明显高于相同份数Al N的EP/Al N复合材料的热导率。当MWCNTs含量为1.5份、Al N含量为40份时,EP/Al N/MWCNTs复合材料的综合性能最优异,冲击强度为22.118 k J/m2,弯曲强度为124.40 MPa,热导率达到0.434 W/(m·K)。     

含不同固化剂的EP/T–ZnOw复合材料的性能

研究加入不同固化剂T31和JA–1后对环氧树脂(EP)/四针状氧化锌晶须(T–ZnOw)复合材料性能的影响。测试了复合材料的拉伸强度、缺口冲击强度、导热性能和介电强度。结果表明,JA–1固化体系的力学性能和介电强度比T31固化体系更优越。当T–ZnOw含量为5份时,加入JA–1及T31固化剂时EP/T–ZnOw复合材料的拉伸强度最大值分别是31.4 MPa和27.6 MPa;加入JA–1固化剂时,当T–ZnOw含量为3份时EP/T–ZnOw复合材料的缺口冲击强度最高达到29.5 kJ/m2,加入T31固化剂的复合材料的缺口冲击强度基本在10 kJ/m2以内;当T–ZnOw含量为5份时加入JA–1和T31固化剂后复合材料的介电强度分别比纯EP增加了116%和106.7%。复合材料中加入T31固化剂后的导热性能要比JA–1固化剂的稍好。     

PET/硅灰石复合材料性能研究

主要研究了硅灰石含量对PET力学性能、耐磨性能和结晶性能的影响。力学性能测试结果表明:随着硅灰石含量的增加,PET的冲击强度和拉伸强度均先上升而后下降,在硅灰石质量分数为6%时冲击强度最大。另外,硅灰石的加入改善了PET的耐磨性能,9%的硅灰石对PET/硅灰石复合材料的耐磨性改善最佳。此外,从DSC测试结果可知:硅灰石能够促进PET结晶提高其玻璃化转变温度和结晶速率。     

蒙脱土改性环氧树脂及其复合材料性能研究

以蒙脱土(MMT)作为EP(环氧树脂)的改性剂制备EP/MMT纳米复合材料。考察了MMT含量对EP/MMT体系的凝胶时间、黏度和力学性能等影响。结果表明:MMT的加入明显缩短了EP体系的凝胶时间,并显著缩短了EP体系达到高黏度的时间;当w(MMT)=4%时,EP/MMT纳米复合材料的力学性能相对最好,其浇铸体的拉伸强度、弯曲强度和冲击强度分别为85 MPa、140 MPa和35 kJ/m2,其复合材料的拉伸强度和弯曲强度分别为160 MPa和200 MPa。     

PET石墨烯复合材料的制备及性能研究

将氧化石墨烯(GO)与精对苯二甲酸(PET)、乙二醇(EG)进行原位聚合,制备了氧化石墨烯/PET(GO/PET)复合材料,研究了氧化石墨烯对PET聚酯的热性能、结晶性能的影响,并制备复合材料纤维,测试了其力学性能.结果表明:GO的加入提高了PET的热稳定性、结晶温度及结晶速率但没有改变PET的成核方式和生长方式.与纯PET相比,加入GO后纤维的拉伸强度降低,断裂伸长率提高,但与低GO含量的PET纤维相比,GO含量较高的PET纤维的拉伸强度更高.     

有机累托石/环氧树脂(OREC/EP)复合材料的制备和性能研究

用单体原位插层技术制备了有机累托石/环氧树脂(OREC/EP)复合材料,考察了OREC的加入及其含量对复合材料OREC/EP体系的力学性能、耐介质性能和耐紫外线性能的影响。研究发现:OREC是一种良好的环氧树脂增韧改性剂,OREC的加入可改善复合材料的综合性能。当OREC质量分数为3%时,冲击强度和弯曲强度提高幅度最大,分别为6.25%和8.39%,耐海水性能效果最好;在添加质量分数为1%~7%时,复合材料体系的耐酸(碱)和耐紫外线性能均随OREC含量的增加而上升。     

氧化石墨烯增强环氧树脂复合材料的制备与性能

利用二乙烯三胺在氧化石墨烯(GO)表面引入氨基基团得到改性GO,然后与环氧树脂(EP)复合,制备出GO增强EP复合材料。性能测试结果表明,该复合材料具有良好的疏水性及力学性能。复合材料的吸水率随着改性GO含量增加先降低后提高,当改性GO含量为0.2%时,吸水率最低,浸泡12 d后吸水率为0.125%,与纯EP相比降低了81.48%,当改性GO含量继续增加,由于复合材料界面局部空隙的增加,吸水率反而大幅上升。复合材料的拉伸强度、冲击强度随着改性GO含量增加先提高后降低,当改性GO含量为0.05%时,拉伸强度、冲击强度最高,分别为50.94 MPa,5.78 k J/m2,相比纯EP增加了104%和90%。综合考虑,当改性GO含量为0.05%时,复合材料的分散性能、疏水性及力学性能较优。     

Influence of complexing treatment and epoxy resin coating on the properties of aramid fiber reinforced natural rubber

In this work, natural rubber/aramid fiber (NR/AF) composites were prepared with master batch method. AF was modified by using epoxy resin (EP) and accelerator 2‐ethyl‐4‐methylimidazole (2E4MZ) through surface coating on the basis of the complexing treatment with CaCl₂ solution. Hydroxyl‐terminated liquid isoprene rubber (LIR) was regarded as a compatibilizer between EP and NR. It is found that the crystallinity on AF surface is decreased by complexing reaction with CaCl₂ solution. Swelling and mechanical properties of the vulcanized composites, such as swelling degree, tensile and tear strength, tensile modulus at 300% elongation, are measured, and the tensile fracture morphology and dynamic mechanical analysis of the composites are investigated. The results show that the mechanical properties of composites with modified fibers are improved obviously and interfacial adhesion between matrix and the fiber is enhanced, especially for the AF coated with EP and imidazole. The best comprehensive mechanical properties of the composites are obtained with using CaCl₂‐EP/2E4MZ system when the ratio of m(EP)/m(AF) is 3%. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42122.     

Epoxy hybrid composites cured with octaaminophenyl polyhedral oligomeric silsesquioxane

Polyhedral oligomeric silsesquioxane-containing hybrids of epoxy resins are prepared via the cocuring reaction between octaaminophenyl polyhedral oligomeric silsesquioxane (OAPS) and brominated epoxy resin (EP). The gel time, dispersion, thermal properties, mechanical properties, water absorption, and dielectric properties of the OAPS/EP composites are studied. The gel time of the 1 wt % OAPS composites is significantly higher compared with that of the epoxy resin control. Wide angle X-ray diffraction and scanning electron microscopy show that, at the molecular level, the appropriate amount of POSS cages was dispersed in the epoxy matrix because the POSS monomer participated in the crosslinking reaction. The thermal and mechanical properties of the composites are enhanced as 1 wt % OAPS was added to the epoxy system. The water absorption of the 1 wt % OAPS composite significantly declines. The dielectric constant of the 1 wt % OAPS composite is 0.5 less than that of the epoxy resin control in the range of 100 Hz–40 MHz. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Thermal stability of surfactants with amino and imido groups in poly(ethylene terephthalate)/clay composites

Effects of thermal stability of surfactants with amino and imido groups on thermal properties of poly(ethylene terephthalate) (PET)/clay composites were studied. The imidosilane surfactant was synthesized successfully from the imide reaction between amino silane and phthalic anhydride. TGA shows that imidosilane decomposition behaviors have two major stages according to the degradations of different functional groups. After melt extrusion, the decomposition of amino functional groups in amino surfactants decreases the thermal stability of organoclay and accelerates the degradation behaviors of PET composites. Because of the enhanced thermal stability of imidosilane surfactants, PET/imido‐palygorskite (PT) composites represent enhanced thermal stability, good dispersion and low thermal expansion. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Preparation and EMI shielding properties of nickel‐coated PET fiber filled epoxy composites

Electrically conductive composites were prepared using epoxy resin (EP) as matrix and nickel‐coated polyethylene teraphthalate (PET) fibers as filler. The fibers were coated with nickel by plating and ultrasonic electroless deposition techniques. The coaxial transmission line method was used to measure the electromagnetic interference (EMI) shielding effectiveness of the nickel‐coated PET fiber/EP composites. The contents of nickel and phosphorus in the coating were determined by X‐ray photoelectron spectroscopy (XPS). As a result, the ultrasonic electroless nickel‐coated PET fiber/EP composites showed excellent electrical conductive capability and better EMI shielding effectiveness due to higher content of nickel and lower content of phosphorus in the coating than conventional plated nickel‐coated PET fiber/EP composites. POLYM. COMPOS., 27:24–29, 2006. © 2005 Society of Plastics Engineers     

Enhancement of thermal conductivity for epoxy laminated composites by constructing hetero-structured GF/BN networks

Due to the rapid development of multifunctional and miniaturized electronic devices, the demand for polymer composites with mechanical properties, high-thermal conductivity, and dielectric properties is increasing. Therefore, the heat dissipation capacity of the composite must be improved. To solve this problem, we report a glass fabric (GF)/boron nitride (BN) network with a highly thermally conductive hetero-structured formed using polyvinyl alcohol (PVA) as an adhesive. The GF and BN are furtherly modified by (3-aminopropyl)triethoxysilane (APTES) for better thermal conductivity enhancement. When the BN content is 30%, the thermal diffusion coefficient and thermal conductivity of obtained PVA-mBN@mGF (PBG) are 2.843 mm²/s and 1.394 W/(m K), respectively. Epoxy (EP) resin is then introduced to prepare PBG/mBN/EP laminated composites via the hot pressing method as applied as thermal conductive composites. A highest thermal conductivity of 0.67 W/(m K) of PBG/mBN/EP laminated composites is obtained, three times higher than that of pure EP. In addition, the PBG/mBN/EP laminated composites also present favorable mechanical, electrically insulating, and dielectric properties.     

聚碳酸酯改性环氧树脂的固化动力学与热性能研究

用动态DSC法研究了聚碳酸酯(PC)改性环氧树脂(EP)体系的固化行为,采用Flynn-Wall-Ozawa法分析了EP/PC体系固化活化能与转化率的关系,利用Kissinger和Crane方程研究了EP/PC体系固化动力学参数,并用TG和DSC研究了复合体系的热性能。结果表明:PC的加入没有改变EP的固化机理,反应级数基本不变,但是降低了EP固化物的热分解温度和玻璃化转变温度。     

摩尔质量对软质PVC/EP树脂复合材料性能的影响

以环氧树脂(EP)为改性剂,研究了三种不同摩尔质量软质聚氯乙烯(S-PVC)的力学性能,考察了EP含量,后热处理等条件对S-PVC/EP复合材料性能的影响。实验结果表明:EP能有效降低S-PVC的压缩永久变形;后热处理使得EP进一步固化,有利于压缩永久变形的降低;随着PVC摩尔质量的增加,S-PVC/EP复合材料的力学性能提高。     

超支化聚合物接枝纳米TiO_2/环氧树脂复合材料的制备与表征

利用偶联剂KH-550和超支化聚(胺-酯)(HBP)对纳米TiO2进行改性,并制备了纳米TiO2/环氧树脂(EP)复合材料。对复合材料的结构、力学性能、加工性能以及热性能进行了研究。研究结果表明,HBP接枝改性纳米TiO2(TiO2-g-HBP)的引入可明显提高复合材料的力学性能、热性能及加工性能;当w(TiO2-g-HBP)=1%时,复合材料的力学性能最好,其冲击强度和弯曲强度比纯EP分别提高了135.51%和22.98%;扫描电镜(SEM)结果显示,TiO2-g-HBP/EP复合材料由脆性断裂转变为韧性断裂。     

Effects of the recycled poly(ethylene terephthalate) fibers on the rigid polyurethane foam

Recycled poly(ethylene terephthalate) (PET), subjected to the treatment with the flame retardant first, was used to reinforce the rigid polyurethane foams (RPUFs). Different loadings of PET fibers (3–12 wt %) of different lengths (5, 10, 15, and 20 mm) were added into RPUF. The mechanical properties of composites were studied by compressive strength test and shear stress test. The flame-retardant properties were evaluated by cone calorimeter and limited oxygen index test. The results showed that the proper addition of PET fibers could improve the mechanical and flame-retardant properties of the material. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47758.     

聚丙烯/环氧树脂复合材料的制备及其性能研究

在聚丙烯(PP)基体中加入环氧树脂(EP)、固化剂、马来酸酐接枝聚丙烯(PP-g-MAH),通过动态固化制备了PP/EP复合材料,并对其相容性、力学性能、结晶性能等进行了研究。结果表明:PP/EP为不相容体系,PP-g-MAH作为反应性增容剂对体系的刚性和模量影响较大;通过EP和PP-g-MAH的接枝反应,增强了两相间的界面作用力,降低了EP分散相的尺寸,改善了PP/EP复合材料的力学性能。力学性能测试结果表明,EP与PP-g-MAH的最佳配比为1:1;等温结晶的偏光照片和DSC数据表明,EP阻碍了PP的结晶,使其球晶微细化、结晶度降低。