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Compatibility of liquid deproteinized natural rubber having epoxy group (LEDPNR)/poly ( L ‐lactide) blend
Author(s) -
Nghia Phan Trung,
Siripitakchai Niti,
Klinklai Warunee,
Saito Takayuki,
Yamamoto Yoshimasa,
Kawahara Seiichi
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.27095
Subject(s) - materials science , natural rubber , epoxy , polymer chemistry , glass transition , differential scanning calorimetry , polylactic acid , depolymerization , copolymer , peroxide , composite material , chemical engineering , chemistry , polymer , organic chemistry , physics , thermodynamics , engineering
Reaction after mixing of liquid epoxidized natural rubber/poly( L ‐lactide) blend was performed to enhance the compatibility of the blend. The liquid epoxidized natural rubber was prepared by epoxidation of deproteinized natural rubber with peracetic acid in latex stage followed by depolymerization with peroxide and propanal. The resulting liquid deproteinized natural rubber having epoxy group (LEDPNR) was mixed with poly( L ‐lactide) (PLLA) to investigate the compatibility of the blend through differential scanning calorimetry, optical light microscopy, and NMR spectroscopy. After heating the blend at 473 K for 20 min, glass transition temperature ( T g ) of LEDPNR in LEDPNR/PLLA blend increased from 251 to 259 K, while T g and melting temperature ( T m ) of PLLA decreased from 337 to 332 K and 450 to 445 K, respectively, suggesting that the compatibility of LEDPNR/ PLLA blend was enhanced by a reaction between the epoxy group of LEDPNR and the ester group of PLLA. The reaction was proved by high‐resolution solid‐state 13 C NMR spectroscopy. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008