聚酰胺酸齐聚物改性环氧树脂

以3,3′,4,4′-二苯醚四羧酸二酐和4,4′-二氨基二苯醚为原料合成了以三聚体为主的聚酰胺酸齐聚物(PAA-n)。通过红外光谱、差示扫描量热分析、电喷雾质谱对其进行了表征。用PAA-n作为环氧树脂的反应性改性剂,研究了PAA-n改性环氧树脂的热性能和力学性能。结果表明:合成产物为目标产物,与环氧树脂有很好的化学反应性和相容性,在合适的配比和固化机制下,改性后树脂体系的热性能有所改善,力学性能也有较大的提高。     

Kinetics of Reaction Bisphenol-S Epoxy Resin with Methylacrylic Acid

The reaction kinetics of bisphenol-S epoxy resin with methyl-acrylic acid in the presence of quaternary ammonium salt catalyst was studied. The reaction rate constants at different temperatures were determined. The reaction is first order with respect to epoxy group, zero order with respect to methylacrylic acid and 0.71 order with respect to quaternary ammonium salt catalyst, respectively. The mechanism of this reaction was discussed.     

LC Separation and Online MS Characterization of Saturated and Unsaturated Alginic Acid Oligomers

We report the complete separation and characterization by online high-performance liquid chromatography-electrospray ionization mass spectrometry (LC-ESI-MS) of fully saturated alginic acid (AA) oligosaccharides from DP1 to beyond DP23, obtained by a chemical process, and unsaturated oligomers from DP1 to DP10, produced by lyase treatment. A series of negatively charged species of different m/z ratio are seen for each oligosaccharide. Smaller AA species, from DP1 to DP4, mainly furnish [M–H]^? anions whereas the DP5 to DP9-10 oligomers predominantly exist as the 2- charge state. The AA oligomers from DP10 to DP17 are mainly represented by the [M–3H]^3? anions whereas species from DP18 to DP23 are characterized by the 4? charge state. Online LC-ESI-MS enabled separation and simultaneous characterization of complex saturated and unsaturated AA oligomer mixtures without previous sample treatment, in particular extensive removal of salts to obtain species compatible with ESI-MS.     

Synthesis of Amphiphilic Oligomers of Acrylic Acid

Synthesis of amphiphilic oligomers of acrylic acid via radical polymerization in the presence of thiols as molecular mass regulators is described. The effect of the length of the introduced hydrophobic terminal group on the critical micellization concentration of the acrylic acid oligomers has been elucidated. It has been shown that the incorporation of an antituberculous drug (prothionamide) in the micelles of acrylic acid oligomers is enhanced with the increase in the length of the hydrophobic moiety. The preparation of hydroxyapatite-filled calcium-polycarboxylate bone cements containing prothionamide (promising for the sealing of postoperative cavities) is described.     

查尔酮环氧树脂的合成及其固化性能

以4,4′-二羟基查尔酮为原料,和环氧氯丙烷反应合成了主链含有双键结构的查尔酮环氧树脂（CER）,其结构经¹H NMR和FT-IR确证。采用非等温DSC法研究了甲基四氢邻苯二甲酸酐和4,4′-二氨基二苯基砜两种固化剂对CER的固化反应热行为,通过动态热机械分析和热失重分析对CER的热性能进行了研究。结果表明：甲基四氢邻苯二甲酸酐体系固化的CER的T_g为152.73 ℃,初始热分解温度为350.6 ℃, 800 ℃时的残碳率为19.29%; 4,4′-二氨基二苯基砜体系固化的CER的T_g为251.94 ℃,初始分解温度为365.7 ℃, 800 ℃时的残碳率为46.44%。     

乙烯基三甲氧基硅烷与丙烯酸环氧树脂二元共聚物的合成

以丙烯酸环氧树脂(AE)和乙烯基三甲氧基硅烷(VTMS)为单体,通过溶液聚合法制备了含有机硅氧烷的二元共聚物溶液(AE-VTMS),其结构经IR表征.制备AE-VTMS的最佳反应条件为:AE61g,m(AE)∶m(VTMS)=6∶1,w(甲苯)=40%,w(引发剂)=7‰,于85℃聚合3h.在此条件下,转化率达62.98%.     

热固性环氧树脂的合成与表征

以二乙烯三胺（DETA）、聚二胺基胍盐抗菌剂（PADG）和环氧树脂E-44为原料合成具有优良抗菌性能的环氧树脂。采用FT-IR、DSC、TGA和抗菌实验研究了该树脂的结构与性能。结果表明：该抗菌剂具有优良的热稳定性,能参与环氧树脂的固化反应。加入量不到1％就可使环氧树脂具有高效、持久、广谱的抗菌性,对大肠杆菌和金黄色葡萄球菌的抗菌率均达到99．99％以上,同时保持了环氧树脂优良的力学性能。     

新型多缩水直链聚甘油醚环氧树脂的合成

多缩水聚甘油醚是一种具有较高应用价值的环氧树脂材料。以直链聚甘油为原料,通过两步反应将原料的端羟基全部转化成环氧丙烷基团,得到3种新型多缩水聚甘油醚环氧树脂,其结构经¹H NMR, ¹³C NMR和HR-MS（ESI）表征。     

新型水性环氧树脂的合成研究

以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为改性剂,过氧化苯甲酰(BPO)为引发剂,通过溶液聚合,使环氧树脂获得水分散性。以改性环氧树脂的收率、粒径分布、反应体系酸值随时间的变化为指标,对反应历程进行了推断,并对改性产物的结构进行了红外光谱分析。结果表明,在整个反应中,AMPS与环氧树脂主链接枝反应和与环氧树脂的环氧基团的开环反应同时进行。高聚物收率可达76.72%,体系中的环氧基团约70%被保留下来。改性环氧树脂体系不需中和即可分散于水中。     

四溴双酚A双缩水甘油醚的合成研究

研究了四溴双酚A双缩水甘油醚的合成方法,探索了不同原料摩尔比、溶剂、反应温度、第一步反应中碱的用量以及第一步反应时间对反应的影响,并对产品进行了环氧当量的测定。     

Synthesis and Characterization of a Novel Curing Agent for Epoxy Resin Based on Phosphazene Derivatives

In this work, a novel amine-terminated curing agent for epoxy resin based on hexachlorocyclotriphosphazene (HCCP) was synthesized through two steps of nucleophilic substitution reactions by phenol and 4-aminophenol. Its chemical structure was characterized by ¹H-NMR, Fourier transform infrared spectroscopy (FTIR) and mass spectrometry (MS). This curing agent was liquid at room temperature which made it easy to disperse in the epoxy resin. The rheological test showed the viscosity of the pre-polymer fluid decreased as the proportion of the curing agent increased so it improved the process performance. The curing reaction was studied by differential scanning calorimeter (DSC). The novel curing agent had a wider range of curing temperature and relatively lower curing temperature in comparison with the widely-using curing agent 4,4′-Diaminodiphenylmethane (DDM). The wider range of curing temperature helped lower the heat accumulation which was an important factor in curing process.     

化学改性环氧树脂水基涂料的研究——涂膜性能

用对氨基苯甲酸改性环氧树脂 ,使其具有亲水亲油两亲性质 ,测定了改性产物和纯环氧树脂共混物的玻璃化转变温度 ,结果显示两者能够相容 ,并以改性产物及其与纯环氧树脂的混合物制备水基涂料 ,测定了涂膜的物理和化学性能。结果表明 ,涂膜性能优良 ,保持了溶剂型环氧涂料的抗冲击强度、光泽度和硬度等方面的优点 ,而附着力提高 ,同时柔韧性大为改善 ,涂膜耐水性和耐化学药品性能优良。     

新环氧树脂纳米复合材料的合成和结构研究

以具有层状硅酸盐结构的累托石(REC)为主体,以烷基季铵盐为改性剂合成了有机累托石(OREC),以有机累托石和环氧树脂复合,制备出纳米复合材料。累托石含量在0.8wt.% 时,纳米复合材料具有最佳力学和热学性能,冲击强度增加到65.6 kJm-2,断裂伸长率从4.7 %增加到20.2 %,玻璃化转变温度提高到 197.9 ℃。用X-小角衍射法、透射电镜和红外吸收光谱研究了材料的微观结构,XRD 衍射图显示,未经处理REC 的层间距d001 = 2. 2 nm,经有机改性后,累托石片层间距扩大到2.8 nm,与环氧树脂复合后,其层间距扩大到4.2 nm 左右,FT-IR图显示,有机累托石中出现十六胺的特征吸收峰,TEM照片显示该复合材料是一种纳米复合材料。     

TEG-99环氧树脂的合成与性能研究

以松节油为原料合成出新型TEG - 99环氧树脂 ,研究了它分别与典型胺类、聚酰胺类及酸酐类固化剂的固化反应和固化产物的性能。结果表明 ,以松节油为原料合成TEG - 99环氧树脂的过程简单、稳定 ,产物具有与双酚A型环氧树脂相似的外观、理化性能、固化特征等 ,是松节油综合利用的一个有前景的途径     

有机硅改性环氧树脂的合成与性能研究

用氨基硅油和双酚A型环氧树脂为原料合成一种新型的环氧树脂。研究了不同反应时间、不同反应温度以及不同氨基硅油含量对改性环氧树脂性能的影响,用热重法对改性树脂的耐热性进行了表征。结果表明,用工业产的氨基硅油合成的改性环氧树脂同样具有良好的韧性和耐热性。     

Modification of Epoxy and Amine Oligomers with Oligohexamethyleneguanidine Fatty-Acid Salts

Oligohexamet diglycidyl ether hyleneguanidine (OHMG) stearates and palmitates, which have a higher solubility in epoxy oligomers (EOs) (glycidyl ethers of diphenylolpropane, Epikote 828, and polyglycidyle ether of oligooxypropilene oligooxypropylene polyol, Laproksid 703) than the widely used OHMG hydrochloride has, have been synthesized and characterized. Probably due to the better solubility, pronounced chemical interaction between EOs and OHMG fatty-acid salts occurs to yield adducts of EOs and OHMG, which are completely compatible with an initial EO. It has been proposed to incorporate OHMG fatty-acid salts into epoxy-amine networks via the preliminary synthesis of EO–OHMG adducts.     

双酚A型环氧改性R-122环氧树脂的研究

用双酚A环氧树脂(E-44)改性脂环类环氧树脂(R-122),通过对改性R-122环氧树脂力学性能和热性能的测定,探讨了固化工艺,固化荆体系对改性R-122环氧树脂韧性的影响。结果表明：改性R-122环氧树脂冲击强度提高40％,弯曲强度提高75％,断裂能提高81％,而热变形温度和玻璃化转变温度基本不变。R-122树脂基复合材料随E-44的加入冲击强度和弯曲强度分别提高12％和18％。     

新型环氧丙烯酸树脂增韧剂的合成

用马来酸酐和聚乙二醇1000合成具有反应活性端基的聚乙二醇,用红外与核磁共振进行了表征,并用其对环氧丙烯酸树脂进行改性;研究反应温度、反应时间对反应及产物性能的影响;用红外对反应性聚乙二醇和环氧丙烯酸树脂的固化物进行分析.结果表明,反应性聚乙二醇参与了环氧丙烯酸树脂的固化反应,可在交联网络中构成不同长度的柔性链段,显著地提高了环氧丙烯酸树脂的冲击强度.     

Synthesis and Crystal Structure of a Two-hydroxyphenyl Adamantane-type Epoxy Resin

A two-hydroxyphenyl adamantane-type epoxy resin oligomer,namely 1,3-bis(4-(2,3-epoxpropyloxy)phenyl) adamantine(BEPAD),has been synthesized and structurally characterized by single-crystal X-ray diffraction. The unit cell of C_(28)H_(32)O_4: M_r = 432.5,monoclinic,space group P2_1/n,with a = 10.510(6),b = 16.972(9),c = 13.374(7) ?,β = 109.356(6)o,V = 2251(2) ?~3,Z = 4,D_c = 1.277 Mg×m~(-3) and μ(Mo Kα) = 0.084 mm~(-1). In BEPAD,the methylene and epoxide rings on two ends are statistically disordered. The intermolecular interactions are also discussed,suggesting that the intermolecular interactions in BEPAD are stronger than that in the crystals of similar compounds due to the large adamantine group between the two benzene rings.