Assertion: lignin's structure | /r/CapableOf | comprise a variety of functional groups
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Source sentences:
text: The utilization of lignin in composite materials is possible because of its structure, which comprises a variety of functional groups, such as aromatic and aliphatic hydroxyls, methoxyl, and carbonyl groups, which impart high polarity and sufficient reactivity with various chemicals (Simionescu et al. 1993; Lora and Glasser 2002; Mansouri and Salvadó 2007).