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The influence of 4HB content on the properties of poly(3‐hydroxylbutyrate‐ co ‐4‐hydroxylbutyrate) based on melt molded sheets
Author(s) -
Cong Chuanbo,
Zhang Suyun,
Xu Riwei,
Lu Weichuan,
Yu Dingsheng
Publication year - 2008
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.27873
Subject(s) - crystallinity , differential scanning calorimetry , materials science , thermogravimetric analysis , glass transition , thermal stability , dynamic mechanical analysis , molding (decorative) , composite material , ultimate tensile strength , elongation , tensile testing , yield (engineering) , elastic modulus , polymer chemistry , polymer , chemical engineering , thermodynamics , engineering , physics
A series of poly(3‐hydroxybutyrate‐ co ‐4‐hydroxybutyrate)s[P(3HB‐ co ‐4HB)s] sheets with the 4HB contents from about 9 to 34 mol % were prepared via melt molding. Their crystallinity, crystalline structures, thermal and mechanical properties were characterized by differential scanning calorimetry, X‐ray diffraction, thermogravimetric analysis, dynamic mechanical analysis, and tensile test. It was found that the melt temperatures ( T m ), glass transition temperatures ( T g ), and storage modulus ( E ′) of all the [P(3HB‐ co ‐4HB)s] copolymers investigated decreased continuously with increasing the amount of the 4HB; the yield stress and breaking stress nearly decreased with the increase of the 4HB contents while the elongation at the yield and break points increased; and the thermal stability of the P(3HB‐ co ‐4HB)s improved with increasing 4HB contents. The results suggest that the mechanical properties and crystal lattice parameters of the melt molded sheets are somewhat different from those of the solution cast films. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008