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Tough thermoplastic starch modified with polyurethane microparticles by reactive extrusion
Author(s) -
Zhang Yu,
Huang Lei,
Zhou Hongbin,
Zhang Pingping,
Zhu Mei,
Fan Bingbing,
Wu Qiangxian
Publication year - 2013
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.201200105
Subject(s) - starch , polyurethane , materials science , reactive extrusion , extrusion , prepolymer , thermoplastic , toughness , plastics extrusion , composite material , particle size , chemical engineering , thermoplastic polyurethane , modified starch , polymer chemistry , chemistry , organic chemistry , elastomer , engineering
Abstract In this work, a starch–water mixture was blended with polyurethane prepolymer (PUP) at 0, 5, 10, 15, and 20 wt% and extruded in a twin screw extruder. The ensuing results showed that the reaction ratio of PUP used for modified starch was 98.6 ± 0.3%. This was attributed to the polyurethane particles being formed under shear stress during extrusion processing. Each polyurethane particle contained many NCO groups with high reaction activity, which therefore increased the reaction probability of PUP micro‐particles with starch. The elastic and hydrophobic PUP played an important role in improving the properties of modified starch. SEM showed that the starch and polyurethane had good compatibility; the toughness, hydrophobicity, and thermal stability of modified starch thus sharply improved. This work provided a method for the preparation of high reaction efficiency modified starch.