Increased impact strength of biodegradable poly(lactic acid)/poly(butylene succinate) blend composites by using isocyanate as a reactive processing agent | Zendy

Harada Masaki | Zendy; Ohya Tsubasa | Zendy; Iida Kouji | Zendy; Hayashi Hideki | Zendy; Hirano Koji | Zendy; Fukuda Hiroyuki | Zendy

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Increased impact strength of biodegradable poly(lactic acid)/poly(butylene succinate) blend composites by using isocyanate as a reactive processing agent

Author(s) -

Harada Masaki,

Ohya Tsubasa,

Iida Kouji,

Hayashi Hideki,

Hirano Koji,

Fukuda Hiroyuki

Publication year - 2007

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.26717

Subject(s) - polybutylene succinate , materials science , ultimate tensile strength , izod impact strength test , isocyanate , composite material , lactic acid , rheometry , rheology , dynamic mechanical analysis , charpy impact test , composite number , plastics extrusion , polymer blend , polymer , biodegradable polymer , compatibilization , polymer chemistry , polyurethane , copolymer , genetics , biology , bacteria

Poly(lactic acid) (PLA) blended with poly(butylene succinate) (PBS) was prepared in the presence of lysine triisocyanate (LTI) by using a twin‐screw extruder and injection molding machine. The physical properties, rheological behavior, compatibility, and morphology were investigated by using a tensile test, a Charpy impact test, melt mass‐flow rate (MFR) measurements, size exclusion chromatography (SEC), and laser scanning confocal microscopy (LSCM). The impact strength of PLA/PBS(90/10 wt %) blend composite was about 18 kJ/m 2 in the absence of LTI, and it increased to 50–70 kJ/m 2 in the presence of LTI at 0.5 wt %. The MFR value of PLA/PBS(90/10 wt %) decreased from 25 g/10 min at 200°C in the absence of LTI to approximately 3 g/10 min in the presence of LTI. These results imply that isocyanate groups of LTI reacted with both terminal hydroxyl or carboxyl groups of the polymers. Spherical particles at 1 μm were observed by using LSCM in the presence of LTI. These results indicate that the LTI is a useful reactive processing agent to increase the compatibility of PLA/PBS blend composites to increase the impact strength of PLA. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007

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