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Physical and mechanical properties of poly( L ‐lactic acid) nucleated by dibenzoylhydrazide compound
Author(s) -
Kawamoto Naoshi,
Sakai Atsushi,
Horikoshi Takahiro,
Urushihara Tsuyoshi,
Tobita Etsuo
Publication year - 2006
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.25185
Subject(s) - heat deflection temperature , materials science , differential scanning calorimetry , izod impact strength test , molding (decorative) , composite material , flexural strength , crystallization , polylactic acid , lactic acid , flexural modulus , talc , atmospheric temperature range , amorphous solid , chemical engineering , polymer , ultimate tensile strength , chemistry , organic chemistry , thermodynamics , physics , genetics , biology , bacteria , engineering
Benzoylhydrazide compounds were evaluated as a nucleating agent for poly( L ‐lactic acid) (PLA). From the results of the differential scanning calorimetry, octamethylenedicarboxylic dibenzoylhydrazide (OMBH) was found to be most effective for acceleration of PLA crystallization under higher cooling rate of −50°C min −1 . PLA with OMBH of 1 wt % exhibited very short crystallization half‐time with wide range of isothermal temperature from 90 to 130°C. The molding cycle time of PLA with OMBH in injection molding was less than 3 min, and the cooling time was one‐third of ethylenebis(12‐hydroxystearylamide)/talc system as a nucleating agent. Physical and mechanical properties improved extremely, and the heat distortion temperature of 124°C, flexural modulus of 4.1 GPa, and Izod impact strength of 7.9 kJ m −2 were achieved. This indicates that the utilization of OMBH makes it possible to extend the application range of PLA as automotive parts and electric appliances, which require higher heat resistance and stiffness. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 244–250, 2007