氰酸酯树脂/纳米γ-Al2O3复合材料的制备及性能

将纳米γ-Al_2O_3粒子加入氰酸酯树脂(CE)及环氧树脂(E-54)中,由二月桂酸二丁基锡(DBTDL)引发体系发生自由基聚合反应,制得CE/γ-Al_2O_3系列复合材料。采用示差扫描量热分析、电镜分析及力学、导热性、介电性和耐酸碱腐蚀性测试研究了纳米γ-Al_2O_3粒子用量对复合材料性能的影响。结果表明,无机纳米γ-Al_2O_3粒子的引入有利于CE基体树脂的聚合,其质量分数为10.0%时,复合材料DSC峰顶温度由280.9℃降至218.9℃,导热系数增大8.19倍,电绝缘性良好。其质量分数为6.0%时,复合材料弯曲强度、冲击强度分别达到165.36MPa,14.18 k J/m~2,较纯CE树脂提高了95.34%和62.24%,强酸腐蚀率为0.078%,较纯CE树脂下降42.8%。其质量分数为7.0%时,复合材料强碱腐蚀率为0.162%,较纯CE树脂下降64.8%。综合考虑,无机纳米γ-Al_2O_3粒子的最佳添加质量分数为6.0%。     

CE/SEA-171改性SiC复合材料的制备及性能研究

采用硅烷偶联剂SEA-171对碳化硅粉体(SiC)表面改性,制备了氰酸酯树脂/碳化硅复合材料。研究了SiC含量对复合材料的静态力学性能、电绝缘性能、导热性能和摩擦性能的影响,采用扫描电镜对材料的断面形貌进行了观察。结果表明:SiC质量分数为7%时,复合材料的耐磨性相对于纯氰酸酯树脂(CE)提高79.8%。SiC的质量分数为8%时,复合材料的冲击强度、弯曲强度分别比CE提高94.7%和75.0%,摩擦系数比纯CE降低了45.6%。SiC质量分数为10%时,复合材料的导热系数较CE提高4.7倍。少量SiC粉体的引入能有效改善氰酸酯复合材料的静态力学性能、耐磨性能,且复合材料仍保持良好的电绝缘性能。     

纳米二氧化硅/超支化聚硅氧烷/氰酸酯树脂复合材料的性能研究

采用硅烷偶联剂表面处理过的纳米二氧化硅(nano-SiO2)作为填料改性超支化聚硅氧烷/氰酸酯(HBPSi/CE)树脂体系。结果表明:适量的nano-SiO2既可同时提高HBPSi/CE树脂的韧性和强度,又可改善其耐水性能;当nano-SiO2质量分数为3.0%时,nano-SiO2/HBPSi/CE体系的冲击强度(14.1 kJ/m2)和弯曲强度(118.4 MPa)分别比HBPSi/CE树脂提高了26%和12%,其吸水率低于HBPSi/CE树脂,介电常数略高于HBPSi/CE树脂,介电损耗角正切与HBPSi/CE树脂相当。     

聚丙烯/氧化石墨烯复合材料的制备，结构及性能

以石墨、浓硫酸、高锰酸钾和双氧水等为原料,通过Hummers法制备了氧化石墨烯(GO)分散液,对其冷冻干燥得到GO粉体,将GO粉体与熔融聚丙烯(PP)树脂共混制备PP/GO复合材料,采用FTIR、AFM、TEM、XRD、DSC及导热仪和氧指数测定仪等对GO及PP/GO复合材料的结构和性能进行了表征。结果表明,GO能够以双片层形式均匀地分散在PP基体中,GO/PP复合材料具有致密均匀的微观结构,其力学性能、耐热、阻燃和热传导等性能比对照样品(单纯PP树脂)有显著提高。当GO掺量为0.4%(以PP的质量为基准,下同)时,PP/GO复合材料的拉伸强度、弯曲强度和冲击强度比对照样品分别提高了29.6%、33.6%和62.7%,熔点从154.5℃提高为174.2℃,热导率提升了205.3%,极限氧指数从18.0提高到27.6。     

氰酸酯树脂/纳米三氧化二镧复合材料研究

将纳米三氧化二镧(La_2O_3)粒子加入氰酸酯树脂(CE)基体中,以二月桂酸二丁基锡(BDTL)为引发剂,制得CE/La_2O_3系列复合材料。通过力学性能及耐腐蚀性测试研究了纳米La_2O_3用量对材料性能的影响。结果表明,当纳米La_2O_3添加质量分数为0.3%时,材料弯曲强度达到155.45 MPa,较纯CE提高了83.8%,耐酸腐蚀性最佳,腐蚀率仅为0.09%。纳米La_2O_3添加质量分数为0.4%时,材料冲击强度达13.05 kJ/m2,较纯浇铸体板材提高了48%,耐碱腐蚀性最佳,腐蚀率仅为0.08%。将纳米La_2O_3粒子引入CE基体后,优化了CE树脂的性能。     

原位聚合法制备酚醛树脂/氧化石墨烯复合材料

以自制的氧化石墨烯(GO)为改性填料,采用原位聚合法制备了酚醛树脂(PF)/GO复合材料,通过X射线衍射仪、红外光谱、扫描电镜、热重分析及力学性能测试研究了产物结构,GO在PF中的分散以及GO含量对PF/GO复合材料性能的影响。结果表明,GO在PF基体中的分散度可达到微米级,且未与PF发生化学反应。适量引入GO,可有效提高PF的力学性能和热稳定性,当GO的质量分数为1.0%时,PF/GO的冲击强度和弯曲模量达到最大值7.15 kJ/m~2和19.57 GPa,分别比纯PF提高了14.04%和17.96%,当GO质量分数为1.5%时,PF/GO热稳定性最好,T_(5%)、T_(max)和800℃残炭率分别比纯PF提高58.3℃,8.2℃和2%。     

萘酚改性烯丙基化环保型酚醛树脂的合成及研究

分别以环保型PF(酚醛树脂)和萘酚改性环保型PF为母体,成功合成了烯丙基化PF和萘酚改性烯丙基化PF,并制备了萘酚改性烯丙基化PF/BMI(双马来酰亚胺)共聚树脂;然后分别以上述树脂作为基体树脂,制备了玻璃纤维增强型复合材料。结果表明:当基体树脂为萘酚改性烯丙基化PF/BMI共聚树脂时,相应复合材料的冲击强度(321.6 kJ/m2)和弯曲强度(524.1 MPa)比萘酚改性烯丙基化PF基复合材料提高了11.0%和46.3%,比未改性环保型烯丙基化PF基复合材料提高了42.8%和258.2%,说明萘酚改性烯丙基化PF/BMI共聚树脂的增韧效果优于萘酚改性烯丙基化PF;萘酚改性烯丙基化PF/BMI共聚树脂基复合材料的耐热性能优于未改性烯丙基化PF体系,这是因为前者800℃时的残炭率(39.62%)高于后者(10.92%)所致。     

纳米SiO2改性BOZ/BMI/BADCy共聚物的制备及性能研究

研究了纳米SiO2含量对苯并恶嗪树脂(BOZ)/双马来酰亚胺(BMI)/双酚A型氰酸酯(BADCy)/纳米SiO2复合材料力学性能、热性能和吸水性能的影响。结果表明,当纳米SiO2质量分数为3%时,BOZ/BMI/BADCy/纳米SiO2复合材料具有较高的强度和良好的韧性,其缺口冲击强度和弯曲强度比BOZ/BMI/BADCy共聚物分别提高了11.6%和8.5%;同时,纳米SiO2质量分数为3%时BOZ/BMI/BADCy/纳米SiO2复合材料具有优异的耐热性,其初始热分解温度和最大热分解温度分别为343.2℃和430.3℃。     

CE／HBPSi／GO复合材料的制备与性能

采用硅烷偶联剂表面处理的氧化石墨烯(GO)与氰酸酯树脂(CE)／超支化聚硅氧烷(HBPSi)共混制备了CE／HBPSi／GO复合材料,研究了GO含量对复合材料力学性能、介电性能、热稳定性和吸水率的影响。结果表明,添加适量GO可以有效提高CE／HBPSi的韧性和强度,还可以改善其介电性能、热稳定性和耐湿性。当GO的质量分数为0.8%时,CE／HBPSi／GO复合材料的冲击强度和弯曲强度达到最大值,分别为15.1 kJ／m2和131.6 MPa,并且该体系的介电常数、介电损耗角正切和吸水率均低于CE／HBPSi体系,热稳定性优于CE／HBPSi体系。     

EP/BMI树脂基碳纤维复合材料的制备与性能表征

以环氧树脂(EP)、双马来酰亚胺(BMI)、4,4’-二氨基二苯砜(DDS)和短切碳纤维(SCF)等为主要原料制备了EP/BMI/DDS/SCF复合材料,并研究了SCF添加量对复合材料力学性能和热性能的影响。结果表明,当SCF添加量为0.25 %(质量分数,下同)时,EP/BMI/DDS/SCF复合材料的力学性能提高最大,其拉伸强度、弯曲强度、弯曲模量和缺口冲击强度比未添加SCF时的EP/BMI/DDS复合材料分别提高了48.52 %、32.15 %、25.77 %以及150.91 %;此外,SCF的加入有助于提高复合材料的热性能。     

氰酸酯树脂/纳米氧化铜复合材料制备及性能

将无机纳米氧化铜(CuO)粒子加入氰酸酯树脂(CE),以有机锡(DBTDL)实现自由基引发,定量加入环氧树脂(E–54)制得CE/CuO系列复合材料.测试了复合材料的力学性能、导热性能和耐酸碱腐蚀性能,讨论了复合材料性能得以改变的原因.结果表明,无机纳米CuO粒子的引入,有利于CE基体树脂的聚合,无机纳米CuO粒子含量...     

Synthesis,mechanical property,and thermal stability of reduced graphene oxide–zinc oxide/cyanate ester/bismaleimide resin composites

Reduced graphene oxide–zinc oxide/cyanate ester/bismaleimide resin (RGO–ZnO/CE/BMI) composites were synthesized via a blending method. The RGO–ZnO composite was incorporated into the CE/BMI copolymer to improve the properties of RGO–ZnO/CE/BMI composites. The structure, elements, and morphology of the RGO–ZnO composite were studied with XPS, FTIR, XRD, and SEM analyses. It indicated that the ZnO micro-sphere was attached to RGO by electrostatic attraction and the RGO–ZnO composite was prepared successfully. The mechanical properties and thermal stability of RGO–ZnO/CE/BMI composites were investigated. When RGO–ZnO composite was 1 wt.%, the flexural and impact strengths of RGO–ZnO/CE/BMI composites were 1.07 and 1.35 times of the CE/BMI copolymer, respectively. However, the RGO–ZnO composite tended to aggregate in the CE/BMI matrix with high loading. According to the SEM analysis, appropriate RGO–ZnO composite was evenly dispersed in the CE/BMI copolymer. Compared to the CE/BMI copolymer, the thermal stability of the RGO–ZnO/CE/BMI composites was good. Thus, the RGO–ZnO composite was successfully filled in the CE/BMI matrix; the mechanical properties and thermal stability of the RGO–ZnO/CE/BMI composites were enhanced.     

超支化聚硅氧烷/Ni/石墨烯纳米带/BMI复合材料的摩擦学性能研究

为了改善石墨烯与双马来酰亚胺(BMI)树脂基体的相容性并使其在摩擦过程中快速形成高质量自润滑转移膜,本文以超支化聚硅氧烷(HBPSi)和纳米Ni粒子共同改性石墨烯纳米带(GNRs)制备出HBPSi/Ni/GNRs复合粒子,并将其引入BMI树脂中制备出HBPSi/Ni/GNRs/BMI复合材料。采用FT-IR、SEM、TEM、摩擦磨损试验机及分子动力学模拟对复合粒子的结构、形貌及引入量和复合材料的摩擦学性能的影响进行了研究,并探究了其摩擦磨损机理。结果表明：HBPSi和Ni纳米粒子成功负载到GNRs表面。HBPSi/Ni/GNRs相比于GNRs能够显著提升其BMI复合材料的摩擦学性能。当HBPSi/Ni/GNRs添加量为0.6 wt%时,HBPSi/Ni/GNRs/BMI复合材料的摩擦系数和体积磨损率均降至最低值,分别为0.18和1.9×10_-6 ^mm₃^/(N.m)。此外,分子动力学结果表明,HBPSi/Ni/GNRs与BMI强的界面作用是导致其复合材料抗剪切能力提升的关键。     

Preparation,characterization, and properties of silanized graphene oxide reinforced biobased benzoxazine-bismaleimide resin composites

Silanized graphene oxide (SiGO) was synthesized and characterized using KH570 as a modifier on graphene oxide (GO). Subsequently, high performance silanized graphene oxide/cardanol based benzoxazine (C-fa)-bismaleimide (BMI) resin composites (SiGO/C-fa/BMI) were prepared by blending and step thermal curing. The reaction and dispersion of SiGO in C-fa/BMI matrix were studied by FTIR and XRD. The effects of SiGO on the thermal and mechanical properties of the SiGO/C-fa/BMI composites were investigated. The results shown that SiGO has good dispersity in CFa-BMI matrix. The thermal decomposition temperature and char yield of SiGO/C-fa/BMI composites was improved markedly. Comparing with that of neat C-fa/BMI resin, the young's modulus and tensile strength of SiGO0.5/C-fa/BMI composite increased by 110.8% and 142.0%. The water absorption of SiGO/C-fa/BMI composites also decreased significantly. The great improvement in thermal and mechanical properties of SiGO/C-fa/BMI composites make them as a potential alternative high performance resin composite candidate in aerospace and electronic area.     

石墨烯/玻璃块体复合材料的制备及性能

本文报道了还原氧化石墨烯/钠钙硅(rGO/SLS)玻璃块体复合材料的热压制备和力学性能。首先以3-氨基丙基三乙氧基硅烷为表面活性剂修饰玻璃粉微粒;然后在水溶液中带负电的氧化石墨烯(GO)纳米片通过静电自组装与被氨基修饰过带正电的玻璃颗粒相结合生成复合颗粒。通过高温真空热压烧结,GO被还原成rGO,从而原位生成rGO/SLS玻璃块状复合材料。结果表明,rGO均匀分布在玻璃基质中,并明显增强了复合材料的机械性能。rGO/SLS玻璃块体复合材料中rGO的含量为0.5%(质量分数)时,复合材料的弯曲强度比纯的SLS玻璃提高了约一倍。     

氧化石墨烯/天然橡胶复合材料的制备与性能

采用己内酰胺（CPL）改性氧化石墨烯（GO）（CPL-GO）,与天然橡胶（NR）复合后通过熔融共混法制备了CPL-GO/NR复合材料。考察了CPL-GO用量对CPL-GO/NR复合材料物理机械性能、界面相互作用和气体阻隔性能的影响。结果表明,CPL改性GO后,X射线衍射层间距增加,片层堆砌更为松散,CPL-GO与水接触角增至91.2°。当CPL-GO的质量分数为2.0%时,CPL-GO/NR复合材料的拉伸强度为26.1 MPa,较纯NR提高了50.9%。随着CPL-GO用量的增加,复合材料的储能模量增加,损耗因子的峰值减小,表明GO经CPL表面改性后与NR复合,增强了两相界面间的相互作用,从而提高了复合材料抵抗变形的能力。在40 ℃下,当CPL-GO的质量分数为3.0%时,CPL-GO/NR复合材料的气体渗透系数较纯NR下降了57.1%。     

聚酰亚胺/氧化石墨烯复合材料的制备及其性能

以自制的氧化石墨烯(GO)为改性填料,通过原位聚合法制备了聚酰亚胺(PI)/GO复合材料,并对其形貌、结构和性能进行了表征和测试。结果表明:GO的引入未对PI结构产生破坏作用,且有效提高了PI的力学性能、热稳定性和介电性能,降低了吸水率;当GO质量分数为1.5%时,PI/GO复合材料的拉伸强度达126.9 MPa,较PI提高了55.7%;吸水率由3.65%降至0.92%,质量损失5%时的温度较PI提高了5.8℃;当GO质量分数为2.0%时,介电常数(0.1 MHz)较PI提高了83.1%。     

Mechanical and thermal properties of biphenyldiol formaldehyde resin/gallic acid epoxy composites enhanced by graphene oxide

In this study, the gallic acid‐based epoxy resin (GA‐ER) and alkali‐catalysed biphenyl‐4,4′‐diol formaldehyde resin (BPFR) are synthesized. Glass fibre‐reinforced GA‐ER/BPFR composites are prepared. Graphene oxide (GO) is used to improve the mechanical and thermal properties of GA‐ER/BPFR composites. Dynamic mechanical properties and thermal, mechanical, and electrical properties of the composites with different GO content are characterized. The results demonstrate that GO can enhance the mechanical and thermal properties of the composites. The glass transition temperature, T_g, of the BPFR/GA‐ER/GO composites is 20.7°C higher than the pure resin system, and the 5% weight loss temperature, T_d5, is enhanced approximately 56.6°C. When the BPFR: GA‐ER mass ratio is at 4 : 6 and GO content is 1.0–1.2 wt %, the tensile and impact strengths of composites are 60.97 MPa and 32.08 kJ/m² higher than the pure resin composites, respectively. BPFR/GA‐ER composites have better mechanical properties, and can replace common BPA epoxy resins in the fabrication of composites. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42637.     

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。