共查询到18条相似文献,搜索用时 204 毫秒
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通过测定表面动态接触角研究了两亲性的苯乙烯/甲基丙烯酸嵌段共聚物(PS-b-PMAA)和苯乙烯/甲基丙烯酸(β-羟丙酯)嵌段共聚物(PA-b-PHPMA)的表面动态行为及温度、嵌段长度比等因素对其值的影响,讨论了聚合物表面当接触介质改变时链段或基团的再取向行为和表面性质。 相似文献
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主链含膦酸酯的聚酸酐药物控制释放材料研究 总被引:1,自引:0,他引:1
通过二氯膦甲(乙)酸乙酯与对羟乙氧基苯甲酸反应,制备了二羧苯氧乙氧基膦甲(乙)酸乙酯,并其转化成混合醋酐并通过熔融缩聚,合成了主链含膦甲(乙)酸乙酯的聚酸酐,以二羧苯氧乙氧基膦甲(乙)酸乙酯,分别与1,3-双(4-羧基苯氧基)丙烷(CPP)及癸二酸(SA)共聚,得到相应的共聚酸酐,对所合成的单体和聚合物的结构进行了表征,研究了它们的体外降解,酶促降解及其对抗肿瘤药物5-氟尿嘧啶和氨甲喋蛉的释放性能 相似文献
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氨基硅烷/马来酸酐接枝聚丙烯界面化学反应的研究 总被引:1,自引:0,他引:1
利用溶剂萃取与红外光谱(IR)、光电子能谱(XPS)技术研究了化学键接在玻璃纤维表面的硅烷偶联剂与接枝聚丙烯间的界面化学反应。结果表明:溶剂萃取可以除去玻璃纤维/树脂界面区物理结合的聚合物基体,减少基体信号的影响,在此基础上,利用IR、XPS可以直接证明氨基硅烷(APS)与马来酸酐接枝聚丙烯(MA-g-PP)间发生了界面化学反应,生成了含酰胺基的反应产物。进一步对不同化学状态的N1s的XPS定量分析发现,尽管APS在玻纤表面以开环直链和以氢键结合的环状两种结构形式存在,但在界面上主要是无环开链结构中的氨基与酸酐发生反应。 相似文献
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研究了富氧气氛中高密度聚乙烯(HDPE)的γ-射线辐照氧化及其与尼龙-6(PA6)原共混增容和共混材料的阻隔性能。FT-IR测试结果表明,经γ-射线辐照的HDPE与PA6发生了化学反应或产生了弱相互作用。SEM照片显示4γHDPE(4h辐照,66Gy/min)与PA6具有良好的相容性,PA6在共混体系中呈层状分布。共混材料的阻隔性能测试结果表明4γHDPE/PA6共混物对二甲苯的阻隔性能HDPE/PA6共混物有明显提高。力学性能测试显示4γHDPE/PA6共混物力学性能优良。 相似文献
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交联助剂对PPC/NBR弹性体结构和性能的影响 总被引:2,自引:1,他引:2
研究了马来酸酐(MA)及异氰脲酸三烯丙酯(TAIC)对聚丙撑碳酸酯/丁腈橡胶共混弹性体结构和性能的影响,发出加入MA或TAIC能有效地改善交联网络;加入适量MA能显著改善共混弹性体热氧老化稳定性;加入TAIC使共混弹性体具有优良的高弹特性和力学性能。 相似文献
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王笑天 《影像科学与光化学》2019,37(4):292-296
以双季戊四醇(DPE)为超支化核心,与偏苯三酸酐(TMA)和甲基丙烯酸缩水甘油酯(GMA)反应合成了超支化聚酯树脂。偏苯三酸酐半酯化后产生羧基,羧基再与GMA中的环氧基反应提供UV固化性能。同时研究了温度、催化剂等因素对反应的影响。 相似文献
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Study of properties of modified silicones at solid-liquid interface: fabric-silicone interactions 总被引:1,自引:0,他引:1
Silicones are special reagents that impart desired surface properties such as softness, bounciness and antiwrinkle properties to fabrics and related materials. Although these finishing processes have been practiced routinely, very little is known about the mechanisms involved in modification so that they could be improved. The current study was undertaken to develop basic understanding of the mechanisms responsible for surface modification of fibers using silicones. PDMS based amino silicone emulsions, quaternized to various degrees using dimethyl sulphate, were used in the present study. The electrokinetic properties of the modified silicones were studied as a function of pH. It was expected that the silicone emulsions would show a steady positive zeta potential throughout the pH range due to the quaternization by dimethyl sulphate. Surprisingly, a sudden drop in the zeta potential was observed around pH 8 with the samples turning hazy in the pH range of 8-10. Turbidimetric studies also showed a sudden increase in the turbidity in the pH range 8-10 where commercial processes also encounter problems. It was concluded that the emulsions were destabilized at pH 8-10 thus rendering them ineffective for surface treatment. In order to identify reason for the improvement in fabric properties, fiber structure was monitored using atomic force microscopy. It was observed that the treated fibers were far smoother, relaxed and uniform as compared to the untreated fibers. Thus the morphology of the fabric is modified in a specific way by treatment with specialty silicones. 相似文献
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在乙酸乙酯稀溶液中,将氨值为0.6 mmol/g、Mn=14100的聚(N-β-氨乙基-γ-氨丙基甲基硅氧烷-co-二甲基硅氧烷)(ASO)与羧值为0.3 mmol/g、Mn=4048的聚[γ-(β-羧基丙烯酰胺基)丙基甲基硅氧烷-co-十二烷基甲基硅氧烷-co-二甲基硅氧烷](RCAS)共混自组装,可获得一种静电复合的聚硅氧烷ASO/RCAS.以单晶硅和棉纤维织物作载膜基质,用原子力显微镜(AFM)和光电子能谱(XPS)等仪器对ASO/RCAS的膜形貌及应用性能进行了研究.结果表明,由ASO和RCAS复合成的ASO/RCAS,微观形貌呈连续丘陵状凸起,膜厚度为1.501 nm,在2μm×2μm扫描范围内其均方根粗糙度为0.5 nm.将其附着固定在棉纤维表面,ASO/RCAS不仅能引起纤维表面条纹状沟壑消失,而且能使纤维表面的均方根粗糙度从处理前的24.6 nm降低为处理后的11.7 nm.另外,用ASO/RCAS处理的棉织物,其弯曲刚度明显降低、亲水性增加,且表面有舒适的油润感.当ASO与RCAS的质量比为1∶1时,复合聚硅氧烷ASO/RCAS的应用性能最佳. 相似文献
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Espinosa-Jiménez M Padilla-Weigand R Ontiveros-Ortega A Ramos-Tejada MM Perea-Carpio R 《Journal of colloid and interface science》2003,265(2):227-233
Data are presented on the adsorption of the colloidal dye Disperse Blue 3 onto polyester fabric (Dacron 54, Stile 777), the fabric being pretreated with different amounts of the surfactant potassium ethyl xanthogenate (PEX). This study has been made by means of both the evolution of the zeta potential of the fiber/dye interface and the behaviour of the surface free energy components of the above systems. The kinetics of adsorption of the process of dyeing, using 10(-4) M of PEX in the pretreatment of the fabric, shows that increasing temperature of adsorption decrease the amount of colloidal dye adsorbed onto the fabric. This fact shows that the principal mechanism involved in this adsorption process is physical in nature. The adsorption isotherms of the colloidal dye onto polyester pretreated with different amounts of PEX, shows that the adsorption of the dye is favored with the increase in the concentration of the surfactant used in the pretreatment. This fact shows that the pretreatment with PEX is a very interesting aspect of interest in textile industry. The zeta potential of the system fabric/surfactant shows that this parameter is negative (about -25 mV) for the untreated fiber and decreases in absolute value for increasing concentration of the surfactant on the fiber, the value of the zeta potential of the system being -5 mV for 10(-2) M of PEX. This behavior can be explained for the chemical reaction nucleophilic attack between the carboxyl groups of polyester, ionized at pH 8, and the thiocarbonyl group of the xanthogenate ion. On the other hand, the zeta potential of the system polyester pretreated with PEX/Disperse Blue 3 at increasing concentrations of the surfactant and the dye shows that this parameter increases its negative value strongly with increasing concentration of the surfactant used in the treatment. This can be explained for the hydrogen bonds between the hydroxy groups of the dye and the S- ions of the thiocarbonyl group of the surfactant preadsorbed onto the fiber. 相似文献
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Chonghui Wang Shigeo Nakamura 《Journal of polymer science. Part A, Polymer chemistry》1995,33(13):2157-2163
Aromatic polyester, copolyester, and poly(ester-amide-thioester) having pendant carboxyl groups are directly synthesized by the organic phase/water phase interfacial polyconden-sation using low-molecular and polymeric phase transfer catalysts. Spectral analysis of the resulting polymers indicates that the nucleophilicity of salts of phenols to diacid chloride is far higher than that of salts of carboxylic acids and chemoselective esterification occurs in a 100% yield. Even if the polymeric catalyst having amino acid moiety as a nucleophilic group is used in the polycondensation, the polymers do not contain anhydride groups. The polyester can be almost quantitatively converted to polymers with different reactive groups by reacting the pendant carboxyl groups with alkyl halides in a DMAc-H2O mixture con-taining K2CO3. A bifunctional catalytic mechanism is proposed for the chemical modification of the polyesters. © 1995 John Wiley & Sons, Inc. 相似文献
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以4个杂环芳香胺为重氮组分, 3个N,N-二氰乙基芳香胺为偶合组分, 经重氮化、 偶合反应合成了12个杂环-双氰乙基系列偶氮物; 采用紫外-可见吸收光谱、 红外光谱及核磁共振氢谱等对其结构进行了表征; 还考察了它们在涤纶织物、 乙酰化杉改性木粉和氰乙基化改性木粉上的染色性能. 结果表明, 12个偶氮物为目标产物, 在N,N-二甲基甲酰胺(DMF)中的最大可见吸收波长为417~621 nm, 摩尔吸光系数均大于104. 这些化合物染色涤纶织物的色光分属黄色、 红色、 紫红色和蓝色系列, 并具有高水洗牢度和高日晒牢度; 染色乙酰化木粉和氰乙基木粉的色光和水洗牢度与染色涤纶织物相近. 这12个分散染料具有色谱范围广、 色泽鲜艳、 高发色强度和高牢度等特点, 可用于多种纤维的染色. 相似文献