| Due to its low reactivity, the industrial utilization of lignin has been restricted, so the activation of lignin has become the focus of current research. Lignin is difficult to use because of its structure and properties. Lignin is a three-dimensional reticulated polymer poly phenol compounds, the connection between the main structure subject is ether bond and carbon-carbon bonds, the two key small molecular polarity, high keys can be hard to imagine, and high methoxyl content, low hydroxyl content, benzene superior resistance is big, can be seen from the lignin adhesive synthesis of lignin and phenol, formaldehyde and phenol resin reaction significantly less than its activity. It can be seen that increasing hydroxyl content while decreasing methoxy content and enhancing lignin retroactivity are the basis of lignin reaction. |
