共查询到18条相似文献,搜索用时 515 毫秒
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本文报道了3种高性能聚酰亚胺的核磁共振定量碳谱及氢谱。利用这3种样品化学结构的相似性,根据PEI和DEPT谱,PEI和POI的二维同核化学位移相关谱,碳氢自旋晶格驰豫时间以及化学位移的理论计算,详细分析并归属了3种聚酰亚胺的碳谱峰和氢谱峰,同时验证了其重复单元结构的正确性。 相似文献
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本文报道了环状聚芳酯低聚物的核磁共振碳谱及氢谱。测定了其碳及氢的自旋晶格驰豫时间,通过与类似物质标准谱图的比较、自旋晶格驰豫时间的分析以及化学位移取代基效应的计算等,归属了其碳氢谱峰。 相似文献
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利用核磁共振氢谱和碳谱研究了电化学探讨六氟磷酸二(2,2’-联吡啶)(2,2‘-联吡啶-4,4=-二羧酸)合钌(Ⅱ)的立体结构,并通过二维’H-H同核相关及H-^13C异相关技术对其氢谱和碳谱进行了归属。 相似文献
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基于作者提出的脉冲序列DEPT(distortionless enhancement by polarization transfer)-(90+45),拟定了一个二维碳-氢相关实验,用于测定所有甲基的碳-氢相关信息,联合应用二维DEPT-135实验,从而实现了二维碳-氢相关谱的编辑,对于简化二维碳-氢相关谱具有实用价值。 相似文献
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Song Wang Xiao-hu Yan Rong-shi Cheng Department of Polymer Science Engineering Nanjing University Nanjing China 《高分子科学》1999,(2):135-140
~(13)C-NMR ~1H-decoupled spectra of styrene polymers were assigned by comparison with modelcompounds, then used in measurements of number average molecular weights. The higher limit of an exactdetermination of the end group signal is less than a molecular weight of 10~4. For polymer samples withM_n<10~3, the results obtained from ~(13)C-NMR spectra of saturated carbon region are in excellent agreementwith the values determined by ~1H-NMR, SEC, and VPO methods, while the results from ~(13)C-NMR spectra ofphenyl C-1 carbon region are somewhat higher than the values determined by other methods. 相似文献
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Characterization of ethyl cellulose and its derivative membranes EC-SiMe3 was studied by 1H-NMR, 13C-NMR, solids-state 13C-NMR(CPMAS) and IR spectra. The permselectivity for oxygen and nitrogen of EC-SiMe3 membranes was determined. 相似文献
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A series of ethylene-norbornene copolymers were synthesised using VO (OEt) Cl_2/Al_2Et_3Cl_3 catalytic system and their structure was characterized by ~1H-NMR, ~1H-~1HCOSY NMR and ~(13)C-NMR. Assignments of NMR spectra were given and discussed indetail. 相似文献
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本文系统介绍了结构解析专家系统ESESOC.I.的研制过程。该系统能够综合利用IR,~1H-NMR,~(13)C-NMR对含有C,H,O的有机化合物结构进行自动解析。 相似文献