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Solid state 13 C‐NMR study of a plasticized PLA/PHB polymer blend
Author(s) -
Baran Anton,
Vrábel Peter,
Olčák Dušan,
Chodák Ivan
Publication year - 2018
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.46296
Subject(s) - materials science , polymer blend , crystallinity , polymer , differential scanning calorimetry , amorphous solid , magic angle spinning , glass transition , plasticizer , polymer chemistry , crystallization , chemical engineering , nuclear magnetic resonance spectroscopy , copolymer , composite material , crystallography , chemistry , organic chemistry , thermodynamics , physics , engineering
High‐resolution solid‐state 13 C nuclear magnetic resonance spectra and 13 C spin–lattice relaxation times T 1 ( 13 C) are used to characterize the structure of a polymer blend prepared from poly(lactic acid) (85 wt %) and poly(3‐hydroxybutyrate) (15 wt %) and the effect of the plasticizer triacetine on the structure and molecular dynamics of the blend. Single‐pulse and cross‐polarization magic angle spinning 13 C nuclear magnetic resonance spectra indicate that the nonplasticized polymer blend consists of semicrystalline poly(3‐hydroxybutyrate) domains built into an amorphous poly(lactic acid) matrix. Triacetine supports formation of the crystalline regions within both polymer components in the blend. Spin–lattice relaxation times of carbonyl carbons indicate that the nonplasticized polymer blend consists of noninteracting chains of blended polymers and plasticization of the polymer blend increases the relaxation rate. The glass transition, cold crystallization, and melting processes of the nonplasticized and plasticized blends were also studied using differential scanning calorimetry methods. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46296.