共查询到20条相似文献,搜索用时 218 毫秒
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本文研究了温度、时间、特别是热处理操作对平板玻璃的银扩散着色效果的影响,并用光电子能谱(XPS)、俄歇电子能谱(AES)和电子微分分析(EDAX)等方法,对着色层的元素组成和着色物质的存在状态进行了研究。结果表明,在未经热处理的着色玻璃表层中,着色物质以AgO的形式存在;热处理以后,着色物质以金属银的形式存在,颜色变深则可能是由于胶态银粒长大所致。 相似文献
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溶剂染料是高级塑料着色剂及聚酯纺前着色剂,具有着色力强、耐热性好、耐晒牢度高,色泽鲜艳等优点,在日用塑料、有机玻璃、PVC包装材料、装饰材料、油漆油墨、色母粒等材料的着色,化纤、涤纶、尼龙、醋酸纤维等着色喷丝上应用广泛。溶剂染料属油溶性染料范畴,能溶解于有机溶剂, 相似文献
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刘会超黄意龙龚静华马敬红杨曙光徐坚 《高分子通报》2013,(10):179-183
采用原液着色技术制备了掺杂无机、有机染料的原液着色阻燃共聚酯切片,并对其可纺性及所得着色阻燃纤维性能进行了研究。通过差示扫描量热仪(DSC)、热失重分析仪(TGA)、极限氧指数仪(LOI)、声速仪及纱线强伸度仪等对所得样品进行了表征测试。结果表明,染料的加入对阻燃共聚酯的结晶性能及热稳定性能影响很小,且原液着色阻燃共聚酯的LOI在33%~35%之间,呈现良好的阻燃性能。原液着色阻燃共聚酯切片具有很好的可纺性,热收缩测试表明染料掺杂阻燃共聚酯纤维的热收缩性能有所降低,尺寸稳定性有所提高,着色阻燃纤维的断裂强度能达到2.0cN/dtex以上,可满足纺织品对纤维的强度要求。 相似文献
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利用溶胶-凝胶法制备反射膜、抗反射膜以及着色涂层的研究近年来较引人注目。山本雄二等报道过CoO-SiO_2、CuO-SiO_2、NiO-SiO_2等二元系统着色涂层,涂层的颜色基本上与其中所包含的有色离子颜色相同。本文采用溶胶-凝胶法制备了CoO-CuO-SiO_2着色涂层,得到了具有Co~(2+)和Cu~(2+)的混合颜色的着色涂层,并确定了该体系的成膜区。 相似文献
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Robert N. MacDonald Allan Cairncross J. B. Sieja W. H. Sharkey 《Journal of polymer science. Part A, Polymer chemistry》1974,12(3):663-678
The recent demonstration of an easy synthesis of diiminosuccinonitrile (DISN) from hydrogen cyanide and cyanogen, the reduction of DISN to diaminomaleonitrile (DAMN), and the use of these compounds to form difunctional heterocycles has made several new polyamide intermediates accessible. The 1- and 2-methyl-1,2,3-triazole-4,5-dicarbonyl chlorides have been polymerized interfacially to form high-melting polyamides of good heat stability. Interfacial polymerization of 1-methylimidazole-4,5-dicarbonyl chloride and trans-2,5-dimethylpiperazine has given a polyamide that is water-soluble. The 2,6- and 2,3-pyrazinedicarbonyl chlorides have been similarly converted to high-melting polyamides. 2,6-Dicyano-3,5-dipiperazinylpyrazine has been prepared from tetracyanopyrazine and piperazine and reacted with toluene diisocyanate to form a strong, stiff polyurea. Polyamides were also made from 2,3-diaminoquinoxaline, 1,4,5,6-tetrahydro-5,6-dioxo-2,3-pyrazinedicarbonitrile, and DAMN. 相似文献
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Romina Marín Abdelilah Alla Sebastin Muoz‐Guerra 《Macromolecular rapid communications》2006,27(22):1955-1961
Summary: The formation of stereocomplexes from the pair of enantiomorphs of the chiral polyamide poly(hexamethylene di‐O‐methyl tartaramide) was investigated for a variety of experimental conditions. DSC and X‐ray diffraction data evidenced that efficiency in enantiomeric association is highly sensitive to the procedure used for preparing the complex. A comparative isothermal crystallization study revealed that the stereocomplex crystallized from the melt at a rate lower than the enantiomerically pure components. The radial growth of individual spherulites was also delayed in the crystallization of the complex. No evidence of stereocoupling was detected for other poly(alkylene di‐O‐methyl tartaramide)s with the alkylene unit length different from six. It was concluded that molecular interlocking of hydrogen bonds in the enantiomeric pair is highly selective in this family of polymers.
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The isolation and characterisation of two fish attractants, a new dipeptide (Arcamine, hypotauryl-2-carboxyglycine),1 and Strombine (C-methyl-imino diacetic acid),2 are described. 相似文献
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As the integration of microfluidics into cell biology research proceeds at an ever-increasing pace, a critical question for those working at the interface of both disciplines is which device material to use for a given application. While PDMS and soft lithography methods offer the engineer rapid prototyping capabilities, PDMS as a material has characteristics that have known adverse effects on cell-based experiments. In contrast, while polystyrene (PS), the most commonly used thermoplastic for laboratory cultureware, has provided decades of grounded and validated research conclusions in cell behavior and function, PS as a material has posed significant challenges in microfabrication. These competing issues have forced microfluidics engineers and biologists to make compromises in how they approach specific research questions, and furthermore, have attenuated the impact of microfluidics on biological research. In this review, we provide a comparison of the attributes of PDMS and PS, and discuss reasons for their popularity in their respective fields. We provide a critical evaluation of the strengths and limitations of PDMS and PS in relation to the advancement and future impact on microfluidic cell-based studies and applications. We believe that engineers have a responsibility to overcome any challenges associated with microfabrication, whether with PS or other materials, and that engineers should provide options and solutions that assist biologists in their experimental design. Our goal is not to advocate for any specific material, but provide guidelines for researchers who desire to choose the most suitable material for their application, and suggest important research directions for engineers working at the interface between microfabrication technology and biological application. 相似文献
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Abas SA Hossain MB van Der Helm D Schmitz FJ Laney M Cabuslay R Schatzman RC 《The Journal of organic chemistry》1996,61(8):2709-2712
Two new alkaloids, polycarpine (1) and N,N-didesmethylgrossularine-1 (4), have been isolated from extracts of the ascidian Polycarpa aurata collected in Chuuk, Federated States of Micronesia. Three degradation products of 1 were also isolated. The structures of 1, 2, and 4 were determined by X-ray crystallography. The dimeric disulfide 1 inhibited the enzyme inosine monophosphate dehydrogenase, but the inhibition could be reversed by addition of excess dithiothreitol suggesting that 1 reacts with sulfhydryl groups on the enzyme. 相似文献
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