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SGPAC型螯合剂吸附重金属离子的研究 总被引:4,自引:0,他引:4
本文采用红薯淀粉、玉米淀粉与环氧氯丙烷交联后,用丙烯腈接枝聚合后经皂化处理得到羧基淀粉产物。研究了接枝聚合的主要条件与产品螯合Cu~(2+)、Cd~(2+)等离子的容量关系,制得了几种络合容量相当高的SGPAC产品。并研究了这些产品的使用条件及反复利用的可能性。实践证明,SGPAC型螯合剂是一种重金属离子污染水的高效率处理剂。 相似文献
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两性淀粉接枝共聚物在中性抄纸中的应用 总被引:5,自引:0,他引:5
为考察两性淀粉与丙烯酰胺接枝共聚及阳离子合成的具有功能化、网络化的多元变性淀粉对纸张的增强效果,采用废纸浆为原料,在中性抄纸条件下,对该多元变性淀粉的增强应用性能进行了研究。结果发现,两性淀粉与丙烯酰胺接枝共聚物(AS-g-PAM)及其阳离子化的衍生物(AS-g-CPAM)比两性淀粉具有更好的增强效果,尤其可大幅度提高纸张的环压强度。与两性淀粉比较,用量为0.5%AS-g-PAM和AS-g-CPAM可分别提高环压指数22%和45%以上,对纸张的抗张指数、耐破度等也比使用两性淀粉有不同程度的提高,同时,AS-g-CPAM在0.05%的低用量时,仍具有较好的增强效果。 相似文献
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两性树脂总交换容量的测定 总被引:2,自引:0,他引:2
实验发现采用NaAc振荡平衡来测量两性树脂的总交换容量的方法有误[4],由此对旧方法进行了改进,提出了新的测定两性树脂总交换容量的方法。 相似文献
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互贯法合成强碱弱酸两性树脂及其性能研究 总被引:4,自引:2,他引:4
本文考察凝胶型和大孔型两性树脂的合成条件对所制得树脂的结构和形成内盐键强度的影响,研究了树脂的阴、阳基团含量比,交联度及弱酸基团的不同对树脂脱盐作用的影响。 相似文献
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郭黎平 《高等学校化学学报》1993,14(1):29-32
本文将自制Y式玻碳电极拉上两性接枝星形聚合物(GPSMA)的LB膜,用循环伏安法研究谈膜的屏蔽效应,讨论了接枝量、成膜条件等对膜缺陷的影响,并提出了减少缺陷的办法。 相似文献
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羧基淀粉接枝聚合物对重金属离子的吸附速率方程 总被引:10,自引:0,他引:10
以Ce^4+为引发剂,将丙烯腈接枝到高交联淀粉上,接枝产物再经皂化水解制得水不溶性羧基淀粉接枝聚合物(简称羧基淀粉)。研究了羧基淀粉吸附重金属离子的动力学行为。实验结果表明,羧基淀粉吸附速率快,吸附平衡时间短,吸附量随时间的变化规律遵从Q/Q∞=at(1+at)方程。 相似文献
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本文对含有环氧树脂分子链段、聚醚链段及三乙烯四胺链段的系列多嵌段聚合物(TETA-DGEPG-EPON828、TETA-DGEPG-EPON834及TETA-DGEPG-EPON1001加成物)进行了合成与表征。其HLB的估算值分别为16.6、15.8、13.0;浊点分别为91.0℃、89.0℃、81.0℃,它们能将水溶液表面张力从74mN•m-1降低到36.4~39.4mN•m-1。通过其理化性能的研究,结果表明TETA-DGEPG-EPON834具有优良的水溶性和良好的表面活性。选用它作为相反转乳化剂,可制备出稳定的纳米级的CARDURA E-10封端的EPON828-TETA加成物的水性环氧固化剂胺基分散体乳液。 相似文献
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Ascorbic acid (AA), also known as vitamin C, is a very popular skin-whitening agent used in cosmetics. However, the use of AA (and also its sodium or magnesium salts) in cosmetic products is limited owing to its labile oxidative properties. In order to avoid its early degradation, different derivatives have been designed, such as ascorbyl phosphate (APH; as magnesium or sodium salts) and ascorbyl palmitate (AP), and more recently the ascorbyl glucoside (AG). Bearing in mind that all these chemicals in skin-whitening cosmetic products must be determined in order to control the efficacy of such products, this paper focuses on developing a wide-ranging LC analytical method able to determine the above-mentioned compounds simultaneously in cosmetic products. The chromatographic variables were studied and selected in order to achieve the total separation and subsequent determination of all the analytes involved. Thus, an octadecylsilica (C(18)) stationary phase and a mobile phase gradient of ethanol: 50 mM phosphate buffer at different pHs (containing 0.1 M NaCl) were used. Detection was carried out with a UV/visible spectrometry detector set at different wavelengths. The LOD ranged from 2 to 6 microg/mL depending on the analyte. The proposed method was validated by analysing a laboratory-made and six commercial skin-whitening cosmetic samples. The method allows any mixture of the four skin-whitening agents studied to be both separated at good resolution and determined without interferences from samples, and moreover it does not require the use of either highly toxic organic solvents or hazardous chemicals. 相似文献
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测量了钆螯合物的磁共振成像(MRI)对比度增强试剂钆双胺(omniscan)在大鼠不同组织,包括肝、脾、肾、心脏、肌肉和血液中的核磁共振(NMR)弛豫度,以及在不同的大分子介质环境,如小牛血清白蛋白(BSA)和甲基纤维素(MC)溶液中的弛豫度.实验数据表明:增强试剂钆双胺在小鼠的不同组织中的弛豫度互不相同,在大分子介质溶液中弛豫度随介质大分子浓度的增大而提高. 相似文献
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在阻燃型高抗冲聚苯乙烯(HIPS)中,加入一定量的SiO2作为填充剂。采用偶联剂对无机填料进行表面处理,改善了HIPS与无机填料的界面结构。用电子显微镜观察了无机填料表面处理前后的形态变化。 相似文献
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Meng-Ying Sun Su-Xiang Wu Xin-Bo Zhou Jian-Ming Gu Xiu-Rong Hu 《Acta Crystallographica. Section C, Structural Chemistry》2016,72(4):291-296
Regorafenib {systematic name: 4‐[4‐({[4‐chloro‐3‐(trifluoromethy)phenyl]carbamoyl}amino)‐3‐fluorophenoxy]‐1‐methylpyridine‐2‐carboxamide}, C21H15ClF4N4O3, is a potent anticancer and anti‐angiogenic agent that possesses various activities on the VEGFR, PDGFR, raf and/or flt‐3 kinase signaling molecules. The compound has been crystallized as polymorphic form I and as the monohydrate, C21H15ClF4N4O3·H2O. The regorafenib molecule consists of biarylurea and pyridine‐2‐carboxamide units linked by an ether group. A comparison of both forms shows that they differ in the relative orientation of the biarylurea and pyridine‐2‐carboxamide units, due to different rotations around the ether group, as measured by the C—O—C bond angles [119.5 (3)° in regorafenib and 116.10 (15)° in the monohydrate]. Meanwhile, the conformational differences are reflected in different hydrogen‐bond networks. Polymorphic form I contains two intermolecular N—H…O hydrogen bonds, which link the regorafenib molecules into an infinite molecular chain along the b axis. In the monohydrate, the presence of the solvent water molecule results in more abundant hydrogen bonds. The water molecules act as donors and acceptors, forming N—H…O and O—H…O hydrogen‐bond interactions. Thus, R42(28) ring motifs are formed, which are fused to form continuous spiral ring motifs along the a axis. The (trifluoromethyl)phenyl rings protrude on the outside of these motifs and interdigitate with those of adjacent ring motifs, thereby forming columns populated by halogen atoms. 相似文献
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L沸石导向剂陈化机制的研究 总被引:3,自引:0,他引:3
应用核磁共振和拉曼光谱研究了L沸石导向剂的陈化机制。实验结果表明,当铝源与硅源混合后铝酸根离子与硅酸根离子之间聚合反应很快,同时高聚态硅酸根离子发生了解聚。L沸石导向剂陈化反应的控制步骤是低聚态硅铝酸根离子之间或低聚态硅铝酸根离子与低聚态硅酸根离子之间的定向聚合反应。 相似文献
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The reaction of aliphatic alcohols such as methanol, ethanol and t-butanol with zinc powder at 330 °C under solvothermal conditions produces ZnO nanoparticles. The reaction involves the cleavage
of the C-O bond of the alcohols, which occurs readily on the Zn metal surface. Addition of ethylenediamine to the reaction
mixture yields nanorods, the amine acting as a shape-controlling agent.
Dedicated to Professor Dieter Fenske 相似文献
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糜烂性毒剂是一种以皮肤糜烂为主兼有全身中毒为特点的毒剂。文章介绍了芥子气、氮芥和路易氏气等糜烂性毒剂的发现历史、理化性质、中毒机理、救治方法;同时探讨了无害化转化的方法,包括利用芥子气和路易氏气转化成为太阳能电池的重要物质和利用糜烂性毒剂的中毒机理来研究治癌的化疗药物。 相似文献