Assertion: kraft lignin | /r/MadeOf | thermoplastic
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Source sentences:
text: It had, in the past, been very difficult to exceed a limit of 25-40% (w/w) for incorporating lignin derivatives into polymeric materials, but about 4 years ago it proved possible for the first time to fabricate 85% kraft lignin containing thermoplastics that possess tensile properties which vary monotonically with the degree of intermolecular association.