
Structural investigations of toluene diisocyanate (TDI) and ...
2012年9月25日 · Structural characterization of TDI–TMP based polyurethane prepolymer by 1 H-NMR The side reactions considerably influence the properties of polyurethane prepolymer. The higher molar mass urethane oligomers such as 2TMP–5TDI and 3TMP–7TDI could be given a qualitative and quantitative analyses by GPC and ESI.
二异氰酸酯,聚氨酯及其预聚体的核磁共振表征.pdf
2018年12月21日 · 2 结果与讨论 2.1 二异氰酸酯的表征 较常用的二异氰酸酯是4,4一二苯基 甲 烷 二异氰 酸酯 (MDI)和 甲苯 二异氰 酸酯 (TDI)。 在图lMDI的 1H—NMR谱图中, 对位取代的苯环质子峰应呈AA BB 图型, 图 1MDI的NMR谱 图 但 由于邻、间位质子化学位移很接近,故谱图 &= 128.5+CI+Co+ +C 中近似 为 AB 图型。 由该谱 图求得 为 7.00ppm , 为 7O8ppm 。 按取代苯化学位 式 中,c-,c。 ,cm, 分别为直接连接、邻位、 移经验 关系式 … =703一∑S计 …
Oxidative and non-oxidative degradation of a TDI-based …
2019年3月1日 · Solid-state 13 C NMR spectroscopy of the chars indicates that at temperatures above 300 °C ring fusion of the aromatic components within the foam occurs and this leads to a carbonaceous char which has a complex aromatic structure. In addition, elemental analysis results revealed that a significant quantity of nitrogen is present within the ...
1 H NMR spectra and 13 C NMR spectra of terminated TDI.
1 H NMR spectra and 13 C NMR spectra of terminated TDI. [...] In the present work, nanocomposites based on the partially silane-terminated polyurethanes reinforced with sulfuric acid-treated...
Determination of isomer ratio of TDI using NMR technique
2008年4月1日 · NMR spectra showed that two conformational isomers of these compounds exist in solution, which is not due to cis-trans isomerization of amide bond. We proposed that the spatial interactions ...
甲苯二异氰酸酯在乙二胺水溶液中界面聚合的异型多孔聚脲的形成 …
在本文中,通过将甲苯二异氰酸酯 (TDI) 以恒定速率添加到乙二胺 (EDA) 的水溶液中,通过非常简单的界面聚合制备具有奇特结构的 PU,包括串珠和串形。 研究了EDA/TDI比、聚合温度、TDI添加针头孔径和添加速率等实验条件对PU材料形貌的影响。 结果表明,在 EDA/TDI 比率为 1.43-1.51 的情况下获得珠串 PU,以 1.59-2.20 的相同比率获得串状 PU。 一旦从注射器针头中挤出,首先在 TDI 表面形成硬壳。 串珠和串状PU的大小很容易调整。 它们的 NMR 化学结构表征 …
东华大学武培怡/吴慧青团队《Nano Lett.》: 利用异氰酸酯一步构 …
2022年3月29日 · 以甲苯二异氰酸酯(TDI)为添加剂,作者通过红外、SEM、低场核磁(LF-NMR)、等多种手段表征了所制得膜的多级孔结构:直径为10 ~ 20 μm的大孔作为主通道(R0),密集分布在通道壁上100 ~ 200 nm 的二级孔(Ri),及以脲为交联点的溴化聚苯醚(BPPO)空间交联网络所产生的三级孔(Rj)。 在TDI-BPPO 膜的LF-NMR谱图上出现三种水峰,分别归属于大孔自由水、纳米孔结合水和亚纳米孔结合水,证明了三级孔结构的存在。 图2. TDI-BPPO膜的制备与结构表征. …
Process investigating and modelling for the self ... - Springer
2015年6月3日 · In this article, TDI-based polyisocyanate prepolymer was prepared through self-polymerization of TDI monomer. To investigate the reaction process, a combination of mass spectrometry (MS) and gel permeation (GPC) was employed …
¹H-NMR spectra of: a synthetic product TDI-H of TDI and HEMA; …
Download scientific diagram | ¹H-NMR spectra of: a synthetic product TDI-H of TDI and HEMA; b acrylate copolymer BA-H; c synthetic product THB from TDI-H and BA-H from publication: Bonding...
NMR Analysis to Identify Biuret Groups in Common Polyureas
2018年4月12日 · To clarify the presence of biuret groups in PU has been of great interest. To this end, two samples, based on hexamethylene diisocyanate (HDI) and toluene diisocyanate (TDI) respectively, were synthesized by precipitation polymerization of each of these diisocyanates in water-acetone at 30 °C.
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