Hydrogen bonding in lignin: A Fourier transform infrared model compound study
Hydrogen bonding in lignin: A Fourier transform infrared model compound study
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DOI：
10.1021/bm050288q
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发表时间：
2005-09-01
影响因子：
6.2
通讯作者：
Kadla, JF
中科院分区：
文献类型：
--
作者：
Kubo, S;Kadla, JF
氢键在生物高分子的热性能和力学性能中起着重要的作用。为了研究木质素中氢键的形成，对各种木质素模型化合物进行了傅里叶变换红外（FTIR）分析。在各种条件下研究了四种单体模型化合物和一种二聚体模型化合物。红外光谱分析表明，脂肪族羟基形成更强的氢键比酚羟基。此外，与其他单体模型化合物相比，二聚联苯型结构形成了明显更强的分子间氢键。从模型化合物的研究结果被用来解释所观察到的复杂的氢键系统中存在的软木和硬木技术木质素。结合化学分析，我们讨论了硬木和软木木质素之间氢键的差异和所观察到的玻璃化转变温度的差异。
Hydrogen bonding plays an important role in the thermal and mechanical properties of biopolymers. To investigate hydrogen bond formation in lignin, an abundant natural polymer found in plants, Fourier transform infrared (FTIR) analysis of various lignin model compounds was performed. Four monomeric model compounds and one dimeric model compound were studied under various conditions. FTIR analysis revealed aliphatic hydroxyl groups form stronger hydrogen bonds than phenolic hydroxyl groups. Further, the dimeric biphenyl-type structure formed significantly stronger intermolecular hydrogen bonds as compared to the other monomeric model compounds. Results from the model compound studies were used to explain the observed complex hydrogen-bonding system present in both softwood and hardwood technical lignins. Together with chemical analysis, we discuss the difference in hydrogen bonding between hardwood and softwood lignin and the observed differences in the glass transition temperature.