形状记忆氢化双酚A型环氧树脂的制备与性能

为研究聚丙二醇二缩水甘油醚(JH-230)对热固性形状记忆环氧树脂基本性能的影响,将异佛尔酮二胺(IPDA)与具有不同分子量比的氢化双酚A型环氧树脂(AL-3040)、聚丙二醇二缩水甘油醚(JH-230)共混,经完全固化制备出一种新型的形状记忆氢化双酚A型环氧树脂。借助傅里叶红外光谱仪(FT-IR)、差示扫描量热仪(DSC)、动态热机械分析仪(DMA)和拉伸-回复形状记忆测试分析了热固性形状记忆环氧树脂的分子结构以及JH-230对固化体系玻璃化转变温度、储能模量和形状记忆性能的影响。研究表明,JH-230可以增加固化体系链段的柔韧性;固化体系的玻璃化转变温度与动态模量随JH-230含量的增加而降低;该形状记忆氢化双酚A型环氧树脂体系具有良好的形状记忆性能,且形变完全回复时间随JH-230含量的增加而延长。     

一种用于三维打印系统的光敏预聚物的合成

用聚丙二醇二缩水甘油醚作为原料与丙烯酸反应,合成聚丙二醇二缩水甘油醚二丙烯酸酯,较好的合成条件是反应温度宜控制在100℃~110℃,催化剂N,N-二甲基苄胺的质量分数为0.80%,阻聚剂选用对羟基苯甲醚,其质量分数为0.20%~0.40%。通过实验测试,用这种光敏预聚物制备的光敏树脂,可以作为三维打印快速成形系统使用的实体材料。     

一种含能热塑性聚氨酯弹性体的性能

采用熔融二步法合成了以聚叠氮缩水甘油醚(GAP)为软段、以2,2-二叠氮甲基-1,3-丙二醇和二环已基甲烷二异氰酸酯(HMDI)为硬段的含能热塑性聚氨酯弹性体(ETPUE),通过红外光谱(FT-IR),差示扫描量热(DSC),动态力学性能测试(DMA)及力学性能测试对材料进行了结构和性能的表征.结果表明,所合成的不同硬...     

聚丙二醇二缩水甘油醚对E51树脂力学性能的研究

利用聚丙二醇二缩水甘油醚增韧改性剂与E51共混制备改性树脂,研究聚丙二醇二缩水甘油醚增韧改性剂填量对复合材料常温力学性能及低温力学性能的影响。结果表明,当增韧改性剂填量为20%(质量分数)时,改性树脂的性能最优。在常温下拉伸断裂应变达到了7.5%,与改性前相比提高了82.9%,改性树脂浇注体的常温拉伸强度为93.3MPa,与改性前相比提高了25.2%,压缩强度为129.8 MPa,弯曲强度为116.60 MPa。在低温下改性树脂浇注体的拉伸断裂应变为5.4%,与改性前相比提高了50%,改性树脂浇注体低温拉伸强度为130.4 MPa,低温压缩强度为174.6 MPa,低温弯曲强度为154.9 MPa。     

四脚氧化锌晶须/氢化环氧树脂形状记忆复合材料的制备与性能EI北大核心CSCD

采用不同比例的四脚氧化锌晶须(T-ZnOw)与氢化环氧树脂(H-EP)共混,在聚丙二醇二缩水甘油醚(PPGDGE)和异佛尔酮二胺用量不变的前提下,经完全固化制备出一种新型的复合材料。通过动态力学性能测试、力学测试、红外光谱、扫描电子显微镜和U型形状记忆测试系统地研究了该体系的力学性能和形状记忆性能。实验结果表明,该体系复合材料的玻璃化转变温度最高可达到61.5℃,其力学性能比纯环氧树脂提高了15.87%。该试样具有良好的形状记忆性能,变形的试样几乎可以完全回复。     

照相乳剂坚膜剂二甘醇二缩水甘油醚

照相乳剂坚膜剂二甘醇二缩水甘油醚二甘醇二缩水甘油醚是二甘醇（乙二醇生产的主要副产品）深加工的精细化学品，用作卤化银照相材料的坚膜剂，它符合坚膜剂的一般要求，并具有使照相感光材料的乳剂层在高温高湿下不发生软化和粘结，在高温处理中不发生剥落和起皱的功能。...     

γ-缩水甘油醚氧丙基倍半硅氧烷/甲基丙烯酸缩水甘油酯复合材料的制备和性能

以γ-缩水甘油醚氧丙基倍半硅氧烷和甲基丙烯酸缩水甘油酯以及阳离子光引发剂复合组成固化体系,紫外光照固化获得γ-缩水甘油醚氧丙基倍半硅氧烷/甲基丙烯酸缩水甘油酯复合材料,研究γ-缩水甘油醚氧丙基倍半硅氧烷含量变化对材料本体性能及表面性能的影响。结果表明:材料硬度随γ-缩水甘油醚氧丙基倍半硅氧烷含量增大而增大,γ-缩水甘油醚氧丙基倍半硅氧烷含量变化对复合材料本体热性能无显著影响。复合材料表面疏水性随γ-缩水甘油醚氧丙基倍半硅氧烷含量增大而增大,耐水性增强。XPS结果表明随着γ-缩水甘油醚氧丙基倍半硅氧烷含量增大,材料表面C元素含量降低,O元素含量降低,Si元素含量增大。光固化复合体系有望作为UV固化涂料使用。     

温度和pH双重敏感超支化聚醚胺的合成及在水溶液中的自组装EI北大核心CSCD

通过四官能度单体1,8-对孟二胺与二官能度单体聚乙二醇二缩水甘油醚、聚丙二醇二缩水甘油醚的亲核加成/开环反应,设计合成具有温度/pH双重敏感性的超支化聚醚胺,并采用红外光谱对超支化聚醚胺进行表征。探讨了所合成的一系列超支化聚醚胺的浊点与其分子结构中n(PO)/n(EO)比值的关系;此外,考察了在不同pH环境下,超支化聚醚胺浊点的变化。结果表明,超支化聚醚胺的浊点与分子中n(PO)/n(EO)的比值呈线性关系(y=-4.22x+50.36),浊点随pH的升高而降低。动态光散射和透射电镜分析表明超支化聚醚胺在室温时以纳米胶束形式均匀分散在溶液中,温度升高,胶束粒径增大至微米级,并发生相分离。     

温度和pH双重敏感超支化聚醚胺的合成及在水溶液中的自组装

通过四官能度单体1,8-对孟二胺与二官能度单体聚乙二醇二缩水甘油醚、聚丙二醇二缩水甘油醚的亲核加成/开环反应,设计合成具有温度/pH双重敏感性的超支化聚醚胺,并采用红外光谱对超支化聚醚胺进行表征。探讨了所合成的一系列超支化聚醚胺的浊点与其分子结构中n(PO)/n(EO)比值的关系;此外,考察了在不同pH环境下,超支化聚醚胺浊点的变化。结果表明,超支化聚醚胺的浊点与分子中n(PO)/n(EO)的比值呈线性关系(y=-4.22x+50.36),浊点随pH的升高而降低。动态光散射和透射电镜分析表明超支化聚醚胺在室温时以纳米胶束形式均匀分散在溶液中,温度升高,胶束粒径增大至微米级,并发生相分离。     

喷涂聚脲用羟氨基聚醚的制备及性能研究

通过聚丙二醇二缩水甘油醚和脂肪胺制备羟氨基聚醚,并利用FTIR对羟氨基聚醚的结构进行表征,结果显示有明显的氨基特征峰。用羟氨基聚醚合成了聚脲弹性体,利用DSC和TGA考察了产物的性能,并测试了产物的各项物理机械性能,结果表明羟氨基聚醚能有效降低聚脲的反应速率,制备的聚脲软硬段相混合程度较好,并且具有较好的力学性能。     

Toughening of Epoxy Resin with Solid Amine Terminated Poly （ethylene glycol） Benzoate and Effect of Red Mud Waste Particles

An investigation was carried out to modify the toughness of triethylene tetramine cured DGEBA （diglycidyl ether of bisphenol-A） resin using solid amine terminated poly （ethylene glycol） benzoate （ATPEGB） as modifier with and without red mud waste particles. The solid ATPEGB modifier synthesized from the acid catalyzed esterification reaction of poly （ethylene glycol） （PEG） and 4-amino benzoic acid was characterized by Fourier transform infrared spectroscopy （FT-IR） and ^1H-NMR （nuclear magnetic resonance） spectroscopies, viscosity measurements, and solubility parameter calculation. The unfilled and red mud waste filled modified epoxy networks were evaluated with impact, adhesive, tensile, flexural and thermal properties by differential scanning calorimetry （DSC）, thermogravimetric （TG） and dynamic mechanical analysis （DMA）. The effect of modifier concentration and red mud waste particles on toughening behavior was also investigated. The optimum properties were obtained at 12.5 phr （parts per hundred parts of resin） concentration of the modifier. The ATPEGB modified cured epoxy was thermally stable up to 315℃. The morphology on fracture surfaces of cured epoxy was also analyzed by scanning electron microscopy （SEM）.     

Metallization of cross-linked epoxy resins by reduction of polymer-incorporated metal ions

The metallization behavior of the poly(ethylene glycol) diglycidyl ether films cured with 5-(2,5-dioxotetrahydrofuryl)-3-methyl-3-cyclohexene-1,2-dicarboxylic acid anhydride (DMCDA) by reduction of polymer-incorporated cobalt chloride or nickel chloride was investigated by means of infra-red spectroscopy, dynamic viscoelastic measurement, X-ray photoelectron spectroscopy, scanning electron microscopy and electron probe microanalysis. For the film containing the metal chloride cured at finally 200 °C for 5 h, the metal ion was homogeneously distributed in the inner part of the film, except that the film surface at the air side had a higher metal ion concentration because of the chelation of the metal ion with carboxylic acid group generated by the reaction of DMCDA with water in air. By the reduction treatment in aqueous sodium borohydride at 20–50 °C, the metal ion migrated to both sides of the film and then reduced to pure metal. The metal layer generated at the air side was thicker than the one at the side of a polypropylene plate used in the preparation of film. The X-ray diffraction analysis of the reduced films revealed that the generated cobalt and nickel were almost amorphous.     

Toughening mechanism for a rubber-toughened epoxy resin with rubber/matrix interfacial modification

For a rubber-toughened piperidine-DGEBA epoxy resin, the interface between the rubber particle and the epoxy resin matrix was modified by an epoxide end-capped carboxyl terminated butadiene and acrylonitrile random copolymer (CTBN). The end-capping epoxides used were a rigid diglycidyl ether of bisphenol-A (Epon 828), a short-chain flexible diglycidyl ether of propylene glycol (DER 736), and a long-chain flexible diglycidyl ether of propylene glycol (DER 732). The microstructures and the fracture behaviour of these rubber-modified epoxy resins were studied by transmission electron microscopy and scanning electron microscopy. Their thermal and mechanical properties were also investigated. In the rubber-modified epoxy resins, if the added CTBNs were end-capped by a flexible diglycidyl ether of propylene glycol (DER 732 or DER 736) before curing, the interfacial zone of the undeformed rubber particle, the degree of cavitation of the cavitated rubber particle on the fracture surface and the fracture energy of the toughened epoxy resin were all significantly increased. The toughening mechanism based on cavitation and localized shear yielding was considered and a mechanism for the interaction between cavitation and localized shear yielding that accounts for all the observed characteristics is proposed.     

不同柔性链丙烯酸松香环氧树脂性能比较

以丙烯酸松香二缩水甘油酯(ARE)、丙烯酸松香乙二醇二缩水甘油醚(AR-EDGE)和丙烯酸松香丁二醇二缩水甘油醚(AR-BDGE)为研究对象,通过测定固化反应的凝胶时间、固化产物的耐热性、力学性能及耐溶剂性,研究了不同柔性链对松香基环氧树脂性能的影响。结果表明,松香基的稠环结构有着优异的耐热性,然而也会带来较大的脆性,需引入合适长度的柔性链。三种体系中,AR-EDGE综合性能最好,虽耐热性不及ARE,但其力学性能强于另两种体系;柔性链稍短的ARE因脆性大力学性能不好;柔性链稍长的AR-BDGE耐热性及耐丙酮性不佳,力学性能一般。     

Immobilization of drugs for glaucoma treatment

Recently there have been some developments in the preparation of controlled drug delivery systems for glaucoma. Many materials are being used in this area, namely gelatine and chitosan. Both of them present high levels of biocompatibility and biodegradability. In this paper, we wish to report the work we have been doing on the preparation and characterization of hydrogels based on gelatine and chitosan. The crosslinking agents used were 1-(3-(Dimethylamino)propyl)-3-Ethylcarbodiimide hydrocholide (CDI), 1,4-Butanodiol diglycidyl ether (epoxyde 1), Ethylene glycol diglycidyl ether (epoxyde 2) and genipin. The results obtained showed that all of the films were hydrogels. The surface and transversal cut showed a porous surface in all the films. The thermal analysis proved the modifications in the polymeric chains, with the stabilization of all of them by the crosslinking agents. The release pattern indicates that the gelatine films were the best since they release the adequate proportion of drug. Finally, the cytotoxicity showed that the gelatine films were all biocompatible, specially the ones crosslinked with one of the Epoxydes.     

环硫-环氧活性稀释剂的合成与性能研究

利用环氧活性稀释剂乙二醇二缩水甘油醚(商品名JX-21)和环硫化剂硫脲合成了新型的环氧树脂活性稀释剂,并利用红外光谱等手段研究了产品分子结构。该类活性稀释剂和E-44环氧树脂进行复合并以甲基六氢邻苯二甲酸酐(MeHHPA)为固化剂,考察了固化物力学性能、吸水性及玻璃化温度等。     

Morphology, dynamic mechanical and thermal studies on poly(styrene-co-acrylonitrile) modified epoxy resin/glass fibre composites

Poly(styrene-co-acrylonitrile) (SAN) was used to modify diglycidyl ether of bisphenol-A (DGEBA) type epoxy resin cured with diamino diphenyl sulfone (DDS) and the modified epoxy resin was used as the matrix for fibre reinforced composites (FRPs) in order to get improved mechanical and thermal properties. E-glass fibre was used as the fibre reinforcement. The morphology, dynamic mechanical and thermal characteristics of the systems were analyzed. Morphological analysis revealed heterogeneous dispersed morphology. There was good adhesion between the matrix polymer and the glass fibre. The dynamic moduli, mechanical loss and damping behaviour as a function of temperature of the systems were studied using dynamic mechanical analysis (DMA). DMA studies showed that DDS cured epoxy resin/SAN/glass fibre composite systems have two T_gs corresponding to epoxy rich and SAN rich phases. The effect of thermoplastic modification and fibre loading on the dynamic mechanical properties of the composites were also analyzed. Thermogravimetric analysis (TGA) revealed the superior thermal stability of composite system.     

Preparation of a novel class of phthalocyanine containing cross-linked polymers and their thin films

Prepolymers containing vanadyl phthalocyanines, prepared by the reaction of amino-substituted vanadyl phthalocyanines and diglycidyl ether of biphenol A, can be cured to give transparent network polymeric films, which show absorptions at 780 nm and 820 nm, respectively. The films are stable to organic solvents, inorganic bases and acids. Ultrafast optical responses were observed for both polymers with typical decay time of about 240 fs.     

海因环氧树脂/DDS体系的制备与性能

合成了海因环氧树脂,采用红外光谱和核磁共振进行了表征,制备了海因环氧树脂/二氨基二苯砜(DDS)体系,研究了海因环氧树脂/DDS体系的固化反应特性及固化物的性能。结果表明,树脂体系在100℃~296℃有一放热峰,峰值温度为197℃,140℃的凝胶时间长于42 min,在180℃下仅8 min;树脂浇铸体的氧指数为26.6,弯曲强度为111MPa,弯曲模量为4.14 GPa,冲击强度为14.8 kJ/m2。