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Thermorheological and Mechanical Properties of Copolymers of Lactide, Isosorbide, and Different Phthalic Acids
Author(s) -
Zhang Zucong,
Kricheldorf Hans Rytger,
Friedrich Christian
Publication year - 2015
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201400489
Subject(s) - copolymer , isosorbide , lactide , materials science , phthalic acid , phthalic anhydride , polymer chemistry , polymer science , polyester , chemistry , organic chemistry , composite material , polymer , catalysis
The thermal, rheological, and mechanical behavior of copolymers of lactide, isosorbide, and three different phthalic acids are studied in a wide range of compositions. A linear behavior in glass transition temperature ( T g ) with respect to the mole fraction of isosorbide and phthalate content in the copolymers is observed. This behavior is in quantitative agreement with the well‐known Di Marzio‐Gibbs equation, which correlates the T g with the mole fraction of flexible bonds in the monomers. The viscoelastic properties are found to obey the Williams‐Landel‐Ferry (WLF) behavior. This allows us to compare the zero‐shear viscosity η 0 of all copolymers with different molecular weights at a reference temperature, thus studying the influence of the different phthalic acids on the viscosity. Again, a linear mixing rule on the basis of mole fractions is established in logarithmic scale of viscosities.