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Thermoplastic behavior of lignin with various synthetic plasticizers
Author(s) -
Sakata Isao,
Senju Ryoichi
Publication year - 1975
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1975.070191015
Subject(s) - plasticizer , lignin , sorption , thermoplastic , materials science , polymer , softening point , chemical engineering , solubility , polymer chemistry , chemistry , organic chemistry , composite material , adsorption , engineering
The thermoplasticization of thiolignin (TL) and dioxane lignin (DL) with various synthetic plasticizers has been investigated. The thermal softening temperatures T s of the lignin–plasticizer systems were measured applying the flow tester technique which is useful for investigating the thermal properties of polymers. It was found that the T s of the lignins were lowered considerably as the solubility parameters (after Hildebrand) of the plasticizers approach close to that of lignin, namely, around 11. The lowering in the T s of the lignins with the plasticizers was described by a linear equation with respect to the plasticizer concentration which ranged up to 20 wt‐%. The sorption of the limited amounts (< 5%) of water to the lignins also considerably decreased the T s , however, the extent of lowering in the T s by water sorption is less than that by the plasticizer addition at their contents over about 15%. The relationship of T s to water content (up to about 30%) was curved, not linear. It was clearly shown that a combined use of the plasticizer and water brought about the most effective plasticizing for the lignins compared with the use of either of those alone.