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Synthesis and characterization of starch‐ graft ‐polycaprolactone as compatibilizer for starch/polycarprolactone blends
Author(s) -
Mani R.,
Tang J.,
Bhattacharya M.
Publication year - 1998
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(19980601)19:6<283::aid-marc283>3.0.co;2-c
Subject(s) - polycaprolactone , starch , materials science , ultimate tensile strength , grafting , modified starch , isocyanate , compatibilization , polyester , polymer chemistry , chemical engineering , composite material , polymer blend , copolymer , polyurethane , chemistry , organic chemistry , polymer , engineering
Polycaprolactone (PCL) was grafted onto starch through introduction of urethane linkages. The grafting reaction was carried out in two steps. The first step was the reaction of hydroxyl‐terminated PCL with 2,4‐tolylene diisocyanate. The isocyanate terminated PCL was then reacted with starch to obtain starch‐ graft ‐polycaprolactone (starch‐ g ‐PCL). The grafting reaction was confirmed by FT‐IR spectroscopy. The compatibility of the starch/PCL blend was enhanced with a compatibilizer, starch‐ g ‐PCL, whose amount was 3 wt.‐% of the blend. The tensile strength and morphology of the compatibilized blend were determined. It was found that the compatibilized starch/PCL blend has finer phase domains and an improved interfacial adhesion. Mechanical properties of the compatibilized blend were found to be significantly higher than those of the corresponding uncompatibilized starch/PCL blend.