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.     

Curing mechanism of TDE-85/MeTHPA epoxy resin modified by polyurethane

Diglycidyl 4,5-epoxy tetrahydro phthalate/methyl tetrahydrophthalic anhydride （TDE-85/MeTHPA） epoxy resin modified by polyurethane （PU） was prepared with 1,4-butanediol （1,4-BDO）, trimethylol propane （TMP） and polyurethane prepolymer synthesized by polypropylene glycol and toluene diisocynate. Chemical reaction and curing mechanism of this system were discussed by incorporating the results of infra spectrum analysis. The results indicate that the epoxy polymeric network I is obtained by the curing reaction between TDE-85 and MeTHPA, while the PU polymeric network II is obtained by the chain-extended and crosslinking reaction between 1,4-BDO, TMP and polyurethane prepolymer（PUP）. The graft chemical bonds are formed between polymer networks I and II that therefore increase the degree of blend and compatibility between epoxy polymer and PU.     

环氧树脂改性聚氨酯羟基组分的合成及应用

为提高发泡聚氨酯材料的界面粘接性能,利用二乙醇胺与环氧树脂反应合成端羟基环氧树脂,再将其涂敷于发泡模具的内表面,加入聚氨酯羟基组分并与稍过量的异氰酸酯组分混合均匀后发泡成型,制得环氧树脂改性聚氨酯泡沫材料.研究了合成反应的温度、时间、配比以及反应动力学方程.红外光谱分析结果显示产物的环氧基特征吸收峰消失,且羟基特征吸收峰增强变宽,说明环氧基参与了反应并生成了端羟基环氧树脂.性能测试实验的结果表明:环氧树脂改性聚氨酯具有凝胶、固化快等特点,环氧树脂链段的引入可以将聚氨酯发泡材料的界面粘接强度提高约57％.     

Preparation, morphology and mechanical properties of acrylate-modified polyurethane/unsaturated polyester resin graft-ipns

0　ＩＮＴＲＯＤＵＣＴＩＯＮＰｏｌｙｍｅｒｂｌｅｎｄｓ ,ａｓｅｆｆｅｃｔｉｖｅｗａｙｓｔｏｄｅｖｅｌｏｐａｎｄｄｅｖｉｓｅｎｏｖｅｌｍａｔｅｒｉａｌｓｗｉｔｈｅｘｃｅｌｌｅｎｔｐｒｏｐｅｒｔｉｅｓ ,ｈａｖｅｇａｉｎｅｄｍｏｒｅａｎｄｍｏｒｅｉｎｔｅｒｅｓｔａｎｄｅｍｐｈａｓｉｓｉｎｒｅｃｅｎｔｙｅａｒｓ .Ｉｎｔｅｒｐｅｎｅｔｒａｔｉｎｇｐｏｌｙｍｅｒｎｅｔｗｏｒｋｓ (ＩＰＮｓ) ,ａｓａｓｐｅｃｉａｌｓｏｒｔｏｆｂｌｅｎｄｉｎｇ ,ｒｅｆｅｒｓｔｏｔｗｏｏｒｍｏｒｅｔｈａｎｔｗｏｋｉｎｄｓｏｆｐｏｌｙ…     

互穿网络高吸水树脂的研制及性能的测定

以淀粉、丙烯骏和聚乙烯醇为原料，以过硫酸钾为引发剂，采用水溶液共聚合方法研制互穿网络高吸水树脂，并对其吸水倍率、吸盐水倍率、保水率等性能进行测定。根据正交设计实验，确定最佳的反应条件及配方。所得高吸水树脂最高吸水倍率可以达到1555倍，吸0.9%NaCl水溶液倍率可达到100倍。     

Microstructure and properties of fluoroelastomer/butadiene-acrylonitrile rubber interpenetrating polymer networks

Interpenetrating polymer networks （IPNs） based on fluoroelastomer/butadiene-acrylonitrile rubber （FKM/NBR） by molten blending at a high temperature and chemical cross-linking of two components were prepared. The influence of the two networks component on the mechanical properties and thermostabilities was studied. The experimental results show that the mechanical properties of the IPNs are superior to those of the individual FKM and NBR networks due to forming the case of interpenetrating and intercross-linking between the two networks, the mechanical properties and thermal resistance exhibit higher values when 80/20 （w/w） FKM and NBR is blended and respectively cured simultaneously. The co-continuous morphology of the IPNs in the blends of 80/20 （w/w） FKM/NBR is found by transmission electron microscopy （TEM）, the differential scanning calorimetry （DSC） determination shows that the blends of 80/20 （w/w） FKM/NBR have better compatibility, and the glass transition temperature of the elastomer is -21.5 ℃.     

Isocyanate-terminatcd Polyethers Toughened Epoxy Resin： Chemical Modification, Thermal Properties, and Mechanical Strength

The toughening of the diglycidyl ether of bisphenol A epoxy resin with isocyanateterminated polyethers （ITPE） was investigated. The progress of the reaction and the structural changes during modification process were studied using FTIR spectroscopy. The studies support the proposition that TDI （tolylene diisocyanate） acts as a coupling agent between the epoxy and polyethers, forming a urethane linkage with the former and the latter, respectively. Me THPA-cured ER/ITPs blends were characterized using dynamic mechanical analysis （DMA） and thermogravimetric analysis （TGA）. It is indicated the glass transition temperature （T） of systems was lower than the T of pure epoxy resin and overfull ITPE separated from the modified epoxy resin and formed another phase at an ITPE-content of more than 10wt%. The thermal stability was decreased by the introduction of ITPE. The impact strength and the flexural strength of the cured modifiedepoxy increased with increasing the ITPE content and a maximum plateau value of about 24.03 kJ/m^2 and 130.56 MPa was measured in 10wt% ITPE. From scanning electron microscopy （SEM） studies of the fractrue surfaces of ER/ITPE systems, the nature of the micromechanisms responsible for the increases in toughness of the systems was identified.     

Synthesis and properties of perfluorinated alkyl silicone oil modified epoxy resin

Perfluorinated alkyl silicone oil （PFASO） was successfully synthesized from N-ethyl-N- hydroxylethyl perfluorinated octane sulfonamide, succinie anhydride and amino silicone oil by esterification and amide reaction at moderate temperature in the presence of different catalysts. The chemical structure of the synthesized samples was characterized by Fourier transform infrared spectroscopy （FT-IR）, the relative molecular mass（MM） and molecular mass distribution（MMD） of PFASO were tested by gel filtration chromatography（GFC）. A commercial epoxy resin （DGEBA） was modified with PFASO, with the content of PFASO 1-5 phr. Thermo-gravimetric analysis （TGA）, impact tests, scanning electron microscope （SEM） and water contact angle test were applied to provide accurate results on the thermal stability, toughness and hydrophobicity of PFASO/epoxy complex. The experimental results reveal that epoxy resins can be successfully modified by adding a small amount of as-synthesized modifiers via simple direct mixing, and verify that the as-synthesized modifier can improve the toughness and hydrophobicity of epoxy resin without sacrificing its thermal properties.     

改性环氧PBA／PMMA核壳乳胶粒子的制备与应用

采用半连续种子乳液聚合工艺制备核壳结构的聚丙烯酸丁酯,（聚甲基丙烯酸甲酯-衣康酸-双酚A环氧树脂）（PBA／P（MMA—ITA—DGEBA））乳胶粒子。并通过红外光谱仪（IR）对乳胶粒子进行了表征,证明乳胶粒子具有壮粒子结构。将壳层带有环氧基的核壳乳胶粒子对环氧树脂进行增韧,通过扫描电子显微镜（SEM）对固化物冲击断面进行观测,改性核壳乳胶粒子对环氧树脂起到明显增韧效果,并提升了与环氧树脂的相容性。     

新型环氧树脂固化剂的性能

采用亲核取代反应合成了新型含有醚酮键的芳香胺固化剂(BADK),并对其结构进行了表征。选用BADK作为固化剂,对含有联苯结构的环氧树脂和通用型环氧树脂E-51的固化条件、固化物耐热性和吸湿性进行了研究。实验结果表明:新型固化剂的使用提高了通用型环氧树脂E-51的热性能;含联苯结构的环氧树脂固化物与E-51相比,无论是热性能还是耐湿性都有很大的提高。     

Synthesis and Performance of Transparent Casting Polyurethane Resin

A series of transparent casting polyurethane resins (TCPU) were synthesized from cycloaliphatic diisocyaruae ( 1PDI or H12 MDI) , polyol, chain extender, crosslinking agents, catalyst and special aids (T),which were characterized by FTIR. The thermal stabilities of the obtained TCPU were examined by DSC and TGA , the glass transition temperature ( Tg ) was in the range of 95- 110 ℃ , the initial decomposition temperature (5% weight loss) was 250-265 ℃, and 10% weight loss at the temperature was in the range of 260-286℃ in nitrogen atmosphere. The morphologies of the fractured surfaces of TCPU were revealed by a scanning electron microscope (SEM). The crystalline-amorphous characters of TCPU were studied by WAXD, the result shows that TCPU possesses amorphous glassy characters. The optical properties of TCPU were studied by a UV7500 visible light absorbance measurement. All the samples exhibited excellent optical properties and possessed light transmittarwe in the range of 91%-93% .     

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。     

环氧树脂/BPEA-2潜伏性固化体系固化物的热行为研究

采用热膨胀仪、差式扫描量热分析仪（ Ｄ Ｓ Ｃ） 、热重分析仪（ Ｔ Ｇ） 等方法对 Ｂ Ｐ Ｅ Ａ － ２／ Ｃ Ｙ Ｄ１２８ 潜伏性固化体系的固化物的热稳定性及热形变进行了研究结果表明：体系固化物的热变形温度与固化剂的用量有一定的关系,固化物的热稳定性良好,其初始分解温度在３００ ℃左右,快速分解温区在３００ ～４８０ ℃之间, 体系固化物的热降解活化能约为１６１ ．３ｋ Ｊ／ ｍｏｌ     

TDE-85/芳香胺树脂基体及碳纤维复合材料性能

选用了一种改性芳香胺来固化TDE－85环氧树脂,得到了一种耐热性、工艺性及机械性能都很好的环氧树脂基体,并结合FT－IR,DSC及凝胶化时间的测试分析对该基体的固化反应进行了研究。优化了固化工艺制度,并对该基体的T－700碳纤维复合材料的性能进行了研究。实验证明,该基体与碳纤维粘结良好,纤维强度转化率最高可达86．5％,可用作碳纤维复合材料湿法缠绕成型用高性能树脂基体。     

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.     

环氧-丙烯酸胶乳型互穿聚合物网络稳定性的研究

采用乳液聚合技术,合成了环氧-丙烯酸LIPN,通过对聚合物乳液的收率和Ca2 稳定性的测定,对环氧树脂用量、复合乳化剂的配比、复合乳化剂用量、聚合工艺、水溶性单体以及引发剂用量等影响环氧-丙烯酸LIPN聚合物乳液稳定性的因素进行了分析研究.     

酚醛环氧树脂作为预聚物的紫外光固化涂料的制备及性能研究

以酚醛环氧树脂(F-51)、邻甲酚缩水甘油醚(JX-017)、聚己内酯二元醇(Polyol-0201)和三芳基锍鎓六氟锑酸盐(UVI-6976)作为组分制备一种阳离子型紫外光固化涂料,利用凝胶率测定法对其紫外光固化涂料的光敏性进行研究。同时,对该紫外光固化涂料的贮存稳定性以及它的光固化膜的拉伸性能,冲击强度和铅笔硬度进行了研究。在F-51质量分数60%,JX-017质量分数20%,Polyol-0201质量分数15%和UVI-6976质量分数5.0%时所制备的紫外光固化涂料,其紫外光光固化膜的拉伸强度、断裂伸长率、冲击强度和铅笔硬度分别为30.95 MPa、5.95%、9 kg·cm和5H。     

有机累托石／环氧树脂纳米复合材料制备及其流变性能研究

采用自制离子液体型累托石,用熔融插层法制备有机累托石／环氧树脂／桐油酸酐纳米复合材料。分别用XRD、DSC、旋转流变仪对复合材料的微观结构、固化动力学和流变性能进行测试。结果表明,有机累托石含量较低时在环氧树脂基体中形成了剥离型纳米复合材料;有机累托石的加入,降低了环氧树脂／桐油酸酐体系固化反应的活化能和频率因子,但环氧树脂／桐油酸酐体系的固化反应不是简单的一元反应,有机累托石的加入并不改变其固化反应机理;随着有机累托石含量的增加,环氧树脂／桐油酸酐体系的黏流活化能逐渐增大。     

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%.     

多元改性酚醛树脂/玄武岩纤维复合材料的制备与性能

选用纳米二氧化硅分散液、硼酸、有机硅防水剂、七钼酸铵/季戊四醇复合阻燃剂分别对一种水溶性酚醛树脂进行改性,利用所制备的改性酚醛树脂进一步与玄武岩纤维针刺毡复合,再通过干燥、固化、定型等工艺制备复合板材,并用傅里叶红外光谱仪和示差扫描量热仪分析其结构与固化性能.结果表明,酚醛树脂与各个改性剂结合较好,改性树脂中耐高温结构增多,耐热性能得到改善.将各个改性剂进行复配、优化后提出了最佳配方,使用该配方制备的改性酚醛树脂/玄武岩纤维复合板材具有较好的机械强度与疏水性能,防火性能达到GB8624-2006的A1级标准,与同类产品综合比较优势明显,且该板材在生产加工过程中可以同步实现树脂改性与板材成型,在建筑外墙防火保温领域具有发展潜力.