Structural Characterization of Vulcanized Natural Rubber by Latex State 13C-NMR Spectroscopy

Structural Characterization of Vulcanized Natural Rubber by Latex State 13C-NMR Spectroscopy
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通过乳胶态 13C-NMR 光谱表征硫化天然橡胶的结构

DOI：
10.2324/gomu.78.331
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Riichiro Ohara
Riichiro Ohara
中科院分区：
--
文献类型：
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作者：
Jinta Ukawa;J. Sakai;S. Kawahara;Yoshinobu Isono;Riichiro Ohara

文献摘要

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交联点是影响硫化弹性体力学性能的重要因素之一。提出了用乳胶态~(13)C核磁共振波谱表征硫化天然橡胶交联点的方法，以代替长期存在的固体~(13)C核磁共振谱。硫化后脂肪族碳区44ppm和58ppm的小信号被极化转移无畸变增强(DEPT)和结合质子测试(APT)分别指定给交联点的二、三、四元碳。胶乳状态的~(13)C核磁共振谱是表征硫化天然橡胶不可缺少的手段。
Crosslinking point is one of important factors that govern mechanical properties of vulcanized elastomers. The method of how to characterize the crosslinking points through latex state 13C NMR spectroscopy was proposed for vulcanized NR instead of long standing solid state 13C NMR spectroscopy. Small signals at 44ppm and 58ppm in the aliphatic carbon region, which appeared after vulcanization, were assigned by Distortionless Enhancement by Polarization Transfer (DEPT) and Attached Proton Test (APT) to secondary, tertiary and quaternary carbons of crosslinking points, respectively. The latex state 13C NMR spectroscopy was proved to be indispensable to characterize the vulcanized NR.