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Quantitative analysis for reaction between epoxidized natural rubber and poly ( L ‐lactide) through 1 H‐NMR spectroscopy
Author(s) -
Saito Takayuki,
Klinklai Warunee,
Yamamoto Yoshimasa,
Kawahara Seiichi,
Isono Yoshinobu,
Ohtake Yoshito
Publication year - 2009
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.30846
Subject(s) - natural rubber , lactide , polymer chemistry , materials science , nuclear magnetic resonance spectroscopy , spectroscopy , polymer science , chemistry , copolymer , composite material , polymer , organic chemistry , physics , quantum mechanics
Reaction between epoxidized natural rubber and poly( L ‐lactide) (PLLA) was investigated quantitatively in terms of conversion of the epoxidized natural rubber. The epoxidized natural rubber was prepared by epoxidation of high ammonia natural rubber (HA‐NR) or deproteinized natural rubber (DPNR) with peracetic acid followed by depolymerization with ammonium persulfate. The resulting liquid HA‐NR having epoxy group (LENR) or liquid DPNR having epoxy group (LEDPNR) were subjected to heating at 473 K for 20 min, after blending with PLLA. The products were characterized through morphology observation, DSC measurement, and 1 H‐NMR spectroscopy. The conversions of the rubbers were estimated from intensity ratio of signals in 1 H‐NMR spectrum for the products after removing unreacted rubber with toluene. Difference in the estimated conversion between the LENR/PLLA and LEDPNR/PLLA blends was interpreted in relation to proteins present in the rubber. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010