Assertion: lignin | /r/CapableOf | extend polyurethane molecular chain
Facets:
value: because of special three-dimensional structure
type: CAUSE
value: because of the numerous hydroxyl groups
type: CAUSE
Source sentences:
text: Because of the numerous hydroxyl groups and special three-dimensional structure, the lignin added can not only extend the polyurethane molecular chain, but it can also support a skeleton in a cellular structure.